THE CIRCULAR (AS DEFINED BELOW) AND THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE READ CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED. IF YOU HAVE ANY QUESTIONS OR REQUIRE MORE INFORMATION WITH REGARD TO THE PROCEDURES FOR COMPLETING, EXECUTING AND RETURNING THIS LETTER OF TRANSMITTAL, PLEASE CONTACT THE DEPOSITARY, TSX TRUST COMPANY, AT 1-866-600-5869 (TOLL-FREE WITHIN NORTH AMERICA) OR 1-416-342-1091 (OUTSIDE OF NORTH AMERICA) OR BY E-MAIL AT [email protected].

SHAREHOLDERS WHOSE SHARES ARE REGISTERED IN THE NAME OF AN INTERMEDIARY (SUCH AS A NOMINEE, BROKER, INVESTMENT DEALER, BANK, TRUST COMPANY OR OTHER INTERMEDIARY) SHOULD NOT USE THIS LETTER OF TRANSMITTAL AND SHOULD CONTACT THAT INTERMEDIARY FOR INSTRUCTIONS AND ASSISTANCE IN DEPOSITING THOSE SHARES.

TO BE EFFECTIVE, THIS LETTER OF TRANSMITTAL MUST BE VALIDLY COMPLETED, DULY EXECUTED AND RETURNED TO THE DEPOSITARY. IT IS IMPORTANT THAT YOU VALIDLY COMPLETE, DULY EXECUTE AND RETURN THIS LETTER OF TRANSMITTAL ON A TIMELY BASIS IN ACCORDANCE WITH THE INSTRUCTIONS CONTAINED HEREIN.

LETTER OF TRANSMITTAL

To accompany certificate(s) or DRS Statement(s)

FOR REGISTERED HOLDERS OF COMMON SHARES OF

ALTA COPPER CORP.

This Letter of Transmittal, properly completed and duly executed by a registered holder ("Registered Shareholder") of common shares ("Company Shares") of Alta Copper Corp. (the "Company"), together with all other documents and instruments as TSX Trust Company as depositary (the "Depository" or "TSX Trust") or the Purchaser may reasonably require, must accompany the certificate(s) or DRS Statement(s), as applicable, representing the Company Shares deposited in connection with the proposed arrangement (the "Arrangement") involving the Company, Fortescue Ltd ("Fortescue") and Nascent Exploration Pty Ltd (the "Purchaser"), that is being submitted for approval at the special meeting of holders of Company Shares (the "Shareholders") to be held on Monday, January 26, 2026 at 10:00 a.m. (Vancouver time) (as may be adjourned or postponed, the "Meeting"), all as described in the notice of special meeting of shareholders and management information circular (the "Circular") of the Company dated December 19, 2025.

Capitalized terms used but not defined in this Letter of Transmittal have the meanings given to such terms in the Circular.

Pursuant to the Arrangement, the Purchaser will acquire all of the issued and outstanding Company Shares (other than those held by the Purchaser and its affiliates). Upon the effectiveness of the Arrangement all Shareholders (other than Dissenting Shareholders, if any) will be entitled to receive, for each Company Share (other than a Company Share in respect of which Dissent Rights have been validly exercised and not withdrawn) held by each such holder immediately prior to the Effective Time, cash consideration equal to C$1.40 per Company Share (the "Consideration").

The Company and the Purchaser will implement the Arrangement when all of the conditions to closing have been satisfied and/or waived, including Court approval, the approval of the Arrangement Resolution by the Shareholders and Optionholders at the Meeting and matters in relation to the Investment Canada Act being satisfied. Some of the conditions are beyond the Company's and/or the Purchaser's control, and as a result, there can be no assurance that the Arrangement will be completed, nor can the exact timing of the implementation of the Arrangement be predicted with certainty. Shareholders should refer to the Circular for more information regarding the expected timing for completion and other information relating to the Arrangement.

The Purchaser, Fortescue, the Company and the Depositary, their respective Subsidiaries and any other Person on their behalf, shall be entitled to deduct and withhold from any amounts payable to any Person pursuant to the Arrangement or under the Plan of Arrangement, such amounts as the Purchaser, Fortescue, the Company, the Depositary and their respective Subsidiaries, or any other Person on behalf of any of the

foregoing, is or may be required or permitted to deduct or withhold with respect to such payment under the Income Tax Act (Canada) (the "Tax Act"), the United States Internal Revenue Code of 1986 (the "U.S. Tax Code"), or any provision of local, state, provincial or foreign Law, in each case, as amended. To the extent that amounts are so deducted or withheld, such deducted or withheld amounts shall be treated for all purposes under the Plan of Arrangement as having been paid to such Person in respect of which such deduction or withholding was made, provided that such deducted or withheld amounts are properly reported and actually remitted to the applicable Governmental Entity.

The Consideration is denominated and will be paid in Canadian dollars provided that a Registered Shareholder may prior to the Effective Date elect instead to receive payment in United States dollars by completing the election under the "Currency Election" section of this Letter of Transmittal, in which case such Registered Shareholder will have acknowledged and agreed to the terms set out therein. The Depositary's currency exchange services will be used to convert payment of the Consideration that each Shareholder is entitled to receive. There is no additional fee payable by Registered Shareholders in relation to such conversions of payments.

Information about this Letter of Transmittal

This Letter of Transmittal is for use by Registered Shareholders only and is not to be used by non-Registered Shareholders. Shareholders whose Company Shares are registered in the name of a nominee, broker, investment dealer, bank, trust company or other intermediary (each, an "Intermediary") should NOT use this Letter of Transmittal and should contact that Intermediary for instructions and assistance in depositing those Company Shares.

In order for this Letter of Transmittal to be validly completed, the undersigned is required to provide and complete all of the necessary information for each of the steps indicated below that are applicable to the Registered Shareholder. The Depositary or your financial, legal, tax or other professional advisors can assist you in completing this Letter of Transmittal.

Registered Shareholders who do not forward to the Depositary a validly completed and duly executed Letter of Transmittal, together with the certificate(s) or DRS Statement(s), as applicable, representing their Company Shares (as defined below) and any other documents and instruments as the Depositary or the Purchaser may reasonably require, in accordance with the instructions set forth in this Letter of Transmittal, will not receive the Consideration (less any applicable withholdings) to which they are entitled until such deposit is made and received by the Depositary and until the same is processed for payment or delivery, as applicable, by the Depositary.

In order to permit the timely receipt of the Consideration (less any applicable withholdings) in connection with the Arrangement following the Effective Time, it is recommended that this Letter of Transmittal together with the accompanying certificate(s) or DRS Statement(s), as applicable, representing the Company Shares deposited herewith and all other documents and instruments as the Depositary or the Purchaser may reasonably require, be received by the Depositary at the offices specified on the back cover before the Effective Date. Do not send certificates or DRS Statements, as applicable, representing Company Shares or this Letter of Transmittal to the Company or the Purchaser.

At the Effective Time (whether or not Registered Shareholders deliver this Letter of Transmittal, the certificates or DRS Statements, as applicable, representing Company Shares and any other required documentation to the Depositary), Registered Shareholders will cease to be Shareholders of the Company and the certificate(s) or DRS Statement(s), as applicable, for their Company Shares shall represent only (a) the right to receive the aggregate Consideration in respect of such Company Shares provided under the Plan of Arrangement, less any amounts withheld as provided under the Arrangement Agreement or the Plan of Arrangement; or (b) in the case of Registered Shareholders who properly exercise Dissent Rights, the right to receive fair value for their Company Shares less any amounts withheld as provided under the Arrangement Agreement or the Plan of Arrangement. See the section entitled "Dissenting Shareholders' Rights" in the Circular. Under no circumstances will interest accrue or be paid by the Purchaser, Fortescue, the Company, the Depositary or any other Person to any securityholder of the Company or other Persons depositing certificates or DRS Statements pursuant to the Plan of Arrangement in respect of securities of the Company outstanding immediately prior to the Effective Time, regardless of any delay in making any payment for the Company Shares. The Depositary will act as the agent of persons who have deposited Company Shares pursuant to the Arrangement for the purpose of receiving and transmitting the Consideration to such persons, and receipt of the Consideration by the Depositary will be deemed to constitute receipt of payment by persons depositing Company Shares.

If you are a U.S. Shareholder (as defined below in Box D), you must complete and deliver with this Letter of Transmittal the attached IRS Form W-9, or the applicable IRS Form W-8. See Instruction #8.

Please read the Circular and the instructions set out below carefully before completing this Letter of Transmittal. Delivery of this Letter of Transmittal to an address other than the addresses as set forth herein will not constitute a valid delivery. If Company Shares are registered in different names, a separate Letter of Transmittal must be submitted for each different registered owner. See Instruction #5. Please note that the delivery of this Letter of Transmittal, together with your share certificate(s) or DRS Statement(s), as applicable, representing Company Shares, and any other documents and instruments as the Depositary or the Purchaser may reasonably require, does not constitute a vote in favour of the Arrangement Resolution or any other matters to be considered at the Meeting. To exercise your right to vote at the Meeting, you must complete and return the form of proxy that accompanied the Circular in accordance with the instructions set out in the Circular. See "General Information Concerning the Meeting" in the Circular.

IF ANY REGISTERED SHAREHOLDER DOES NOT DELIVER A PROPERLY COMPLETED LETTER OF TRANSMITTAL, THEIR CERTIFICATE(S) OR DRS STATEMENT(S), AS APPLICABLE, REPRESENTING COMPANY SHARES AND ALL OTHER DOCUMENTS AND INSTRUMENTS AS THE DEPOSITARY OR THE PURCHASER MAY REASONABLY REQUIRE, TO THE DEPOSITARY ON OR BEFORE THE SIXTH ANNIVERSARY OF THE EFFECTIVE DATE, SUCH CERTIFICATE OR DRS STATEMENT, AS APPLICABLE, REPRESENTING COMPANY SHARES SHALL CEASE TO REPRESENT A CLAIM BY OR INTEREST OF ANY FORMER REGISTERED SHAREHOLDER OF ANY KIND OR NATURE AGAINST OR IN THE COMPANY OR THE PURCHASER. ON SUCH DATE, ALL CONSIDERATION TO WHICH SUCH FORMER REGISTERED SHAREHOLDER WAS ENTITLED SHALL BE DEEMED TO BE SURRENDERED FOR NO CONSIDERATION TO THE PURCHASER.

SHAREHOLDERS SHOULD BE AWARE OF THE INCOME TAX CONSEQUENCES OF THE ARRANGEMENT. SEE SECTION "CERTAIN CANADIAN FEDERAL INCOME TAX CONSIDERATIONS" OF THE CIRCULAR THAT ACCOMPANIES THIS LETTER OF TRANSMITTAL.

TO: ALTA COPPER CORP.

AND TO: FORTESCUE LTD

AND TO: NASCENT EXPLORATION PTY LTD

AND TO: TSX TRUST COMPANY at its offices set out herein.

The undersigned hereby deposits with the Depositary, in connection with the Arrangement, for transfer in exchange for the Consideration, the enclosed certificate(s) or DRS Statement(s), as applicable, representing Company Shares and/or Company Shares represented by DRS Statement(s), details of which are as follows: (Please print or type)

| Certificate Number(s) or DRS Account Number(s) | Name and Address in which Company Shares are Registered
(Please fill in exactly as name(s) appear(s) on certificate(s) or DRS Statement(s)) | Number of Company Shares Represented by Certificate(s) or DRS Statement(s) |
| --- | --- | --- |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| TOTAL: | | |

(If space is not sufficient, please attach a list in the above form.)

☐ Some or all of my Company Share certificates or DRS Statement(s), as applicable, have been lost, stolen or destroyed. Please review Instruction #6 for the procedure to replace lost or destroyed certificates or DRS Statements, as applicable. (Check box if applicable.)

If Company Shares are registered in different names, a separate Letter of Transmittal must be submitted for each different Registered Shareholder.

** The total of the numbers filled in above must equal the total number of Company Shares represented by the Company Share certificate(s) or DRS Statement(s), as applicable, enclosed with this Letter.

It is understood that, upon receipt of this Letter of Transmittal validly completed and duly signed, together with the enclosed certificate(s) or DRS Statements(s), as applicable, relating to the Company Shares and any other documents and instruments as the Depositary or the Purchaser reasonably require, and following the Effective Date, the Depositary will send to the undersigned the Consideration in accordance with the delivery instructions provided herein.

IN CONNECTION WITH THE ARRANGEMENT AND FOR VALUE RECEIVED, upon the terms and subject to the conditions set forth in the Circular and in this Letter of Transmittal:

The undersigned hereby surrenders to the Purchaser, effective as of the time provided for in the Plan of Arrangement and in accordance with the Plan of Arrangement, all of the right, title and interest of the undersigned in and to the Company Shares.
The undersigned transmits and/or surrenders herewith the certificate(s) or DRS Statement(s), as applicable, described above for cancellation as of the time provided for in the Plan of Arrangement and in accordance with the Plan of Arrangement.
The undersigned acknowledges receipt of the Circular and represents and warrants that:

a. the undersigned is, and will immediately prior to the Effective Time be, the registered holder of the Company Shares and owns all rights and benefits arising from the Company Shares;

b. the undersigned has full power and authority to execute and deliver this Letter of Transmittal and to deposit, sell and transfer the Company Shares;

c. the undersigned is not a Dissenting Shareholder and has not filed a notice exercising Dissent Rights;

d. the undersigned will execute and deliver any additional documents and instruments as the Depositary or the Purchaser may reasonably require to complete the surrender of the Company Shares;

e. the undersigned either is not a U.S. holder (as such term is defined in Instruction #8) or is a U.S. holder of Company Shares and has completed and returned to the Depositary with this Letter of Transmittal an IRS Form W-9;

f. at the Effective Time, the Purchaser will acquire good title to the Company Shares free and clear from all mortgages, liens, charges, encumbrances, security interests, hypothecs, claims and equities and in accordance with the Plan of Arrangement;

g. the Company Shares have not been, and will not be prior to the Effective Time, sold, assigned or transferred, nor has any agreement been entered into, and no agreement will be entered into prior to the Effective Time, to sell, assign or transfer any such Company Shares to any other person, except as contemplated by this Letter of Transmittal;

h. when the aggregate Consideration to which the undersigned is entitled pursuant to the Plan of Arrangement, less any applicable withholdings, is paid, none of the Company, the Purchaser or any affiliate or successor of such persons will be subject to any adverse claim in respect of such Company Shares; and

i. delivery of the Consideration in respect of the Company Shares will discharge any and all obligations of the Company, the Purchaser and the Depositary with respect to the matters contemplated by this Letter of Transmittal.

The undersigned represents and warrants that the surrender of the undersigned's Company Shares complies with applicable Laws and that the information provided herein is true, accurate and complete as of the date thereof.
The undersigned acknowledges that the covenants, representations and warranties of the undersigned contained herein will survive the completion of the Arrangement.
The undersigned acknowledges that none of the Company, nor the Purchaser nor any of their directors, officers, advisors or representatives are responsible for the proper completion of this Letter of Transmittal.
The undersigned acknowledges that the delivery of the Company Shares will be effected and the risk of loss and title to such Company Shares will pass only upon proper receipt thereof by the Depositary.
The undersigned acknowledges that the Depositary will act as the agent of persons, including the undersigned, who have deposited Company Shares pursuant to the Arrangement for the purpose of receiving and transmitting the Consideration to such persons, and receipt of the Consideration by the Depositary will be deemed to constitute receipt of payment by persons depositing Company Shares.
The undersigned revokes any and all authority, other than as granted in this Letter of Transmittal, whether as agent, attorney-in-fact, attorney, proxy or otherwise, previously conferred or agreed to be

conferred by the undersigned at any time with respect to the Company Shares being transmitted. No subsequent authority, whether as agent, attorney-in-fact, attorney, proxy or otherwise, will be granted with respect to the transmitted Company Shares. All authority conferred or agreed to be conferred by the undersigned in this Letter of Transmittal shall survive the death or incapacity of the undersigned and any obligations of the undersigned hereunder shall be binding upon the heirs, legal representatives, successors and assigns of the undersigned.

The undersigned covenants and agrees to execute all such documents, transfers and other assurances as may be necessary or desirable to convey the Company Shares effectively to the Purchaser. The undersigned understands that by virtue of the execution of this Letter of Transmittal, the undersigned will be deemed to have agreed that all questions as to validity, form, eligibility (including timely receipt) and acceptance of any Company Shares deposited pursuant to the Plan of Arrangement will be determined by the Purchaser and the Company in their sole discretion and that such determination will be final and binding and acknowledges that there will be no duty or obligation on the Purchaser, the Company, the Depositary or any other person to give notice of any defect or irregularity in any deposit and no liability will be incurred by any of them for failure to give such notice.
The undersigned instructs the Depositary, upon the Arrangement becoming effective, to mail the cheque(s) representing payment of the aggregate Consideration payable for the Company Shares, less applicable withholdings, by first class mail, postage prepaid, or to hold such cheque(s) for pick-up, in accordance with the instructions given below; except if, (i) such funds represent an amount in excess of C$25,000,000, in which case the undersigned will receive their Consideration via wire transfer in accordance with the Large Value Transfer System (LVTS) Rules established by the Canadian Payments Association, or (ii) a wire is requested by completing Box E below.
The undersigned acknowledges and agrees that any certificate or DRS Statement formerly representing Company Shares not duly surrendered on or before the sixth anniversary of the Effective Date shall cease to represent a claim by or interest of any former Registered Shareholder of any kind or nature against or in the Company or the Purchaser, and that on such date, all Consideration to which such former holder was entitled shall be deemed to have been surrendered to the Purchaser and will be paid over by the Depositary to the Purchaser as directed by the Purchaser.
The undersigned acknowledges that each of the Purchaser, Fortescue, the Company and the Depositary, their respective Subsidiaries and any other Person on their behalf, will be entitled to deduct and withhold from any amounts payable to any Person pursuant to the Arrangement or under the Plan of Arrangement, such amounts as the Purchaser, Fortescue, the Company, the Depositary and their respective Subsidiaries, or any other Person on behalf of any of the foregoing, is or may be required or permitted to deduct or withhold with respect to such payment under the Tax Act, the U.S. Tax Code, or any provision of local, state, provincial or foreign Law and any amount so deducted or withheld shall be treated for all purposes of the Plan of Arrangement as having been paid to such Person in respect of which such deduction or withholding was made provided that such deducted or withheld amounts are properly reported and actually remitted to the applicable Governmental Entity.
The undersigned acknowledges that the Company and/or the Purchaser may be required to disclose personal information in respect of the undersigned and consents to disclosure of personal information in respect of the undersigned to (i) stock exchanges or securities regulatory authorities, (ii) the Depositary, (iii) any of the parties to the Arrangement, and (iv) legal counsel to any of the parties to the Arrangement.
The undersigned acknowledges that it will not receive payment in respect of the Company Shares until the original certificate(s) or DRS Statement(s), as applicable, representing the Company Shares owned by the undersigned, and such additional documents and instruments as the Depositary or the Purchaser may reasonably require, are received by the Depositary at the address set forth below, and until the same are processed for payment by the Depositary.

Only Registered Shareholders can receive Consideration for their Company Shares by delivering a Letter of Transmittal to the Depositary. Shareholders whose Company Shares are registered in the name of an Intermediary should NOT use this Letter of Transmittal and should contact that Intermediary for instructions and assistance in depositing those Company Shares.

The original certificate(s) or DRS Statement(s), as applicable, described above is enclosed and the Registered Shareholder irrevocably deposits the Company Shares and the above-mentioned certificate(s) or DRS Statement(s), as applicable, representing the Company Shares in exchange for the Consideration to which such holder is entitled pursuant to the Arrangement. The Registered Shareholder transmits the Company Shares and the original certificate(s) or DRS Statement(s), as applicable, representing the

Company Shares, each as described above, to be dealt with in accordance with this Letter of Transmittal.

This Letter of Transmittal will be construed in accordance with and governed by the laws of the Province of British Columbia and the federal laws of Canada applicable therein. The undersigned hereby irrevocably attorns and submits to the exclusive jurisdiction of the courts of the Province of British Columbia situated in the City of Vancouver, and waives objection to the venue of any proceedings in such court or that such court provides an inconvenient forum.

By reason of the use by the undersigned of an English language form of Letter of Transmittal, the undersigned will be deemed to have required that any contract evidenced by the Arrangement as accepted through this Letter of Transmittal, as well as all documents related thereto, be drawn up exclusively in the English language. En raison de l'usage d'une lettre d'envoi et formulaire d'élection en langue anglaise par le soussigné, le soussigné et les destinataires sont présumés avoir requis que tout contrat attesté par l'arrangement et son acceptation par cette lettre d'envoi, de même que tous les documents qui s'y rapportent, soient rédigés exclusivement en langue anglaise.

| BOX A
ISSUE CONSIDERATION CHEQUE IN THE NAME OF:
(PLEASE USE PRINT CHARACTERS) | BOX B
SEND CHEQUE TO:
(To be completed ONLY if the Consideration cheque to which the undersigned is entitled pursuant to the Arrangement is to be sent to someone other than the person shown in Box “A” or to an address other than the address shown in Box “A”.) |
| --- | --- |
| (NAME) | (NAME) |
| (STREET NUMBER & NAME) | (STREET NUMBER & NAME) |
| (CITY AND PROVINCE/STATE) | (CITY AND PROVINCE/STATE) |
| (COUNTRY AND POSTAL/ZIP CODE) | (COUNTRY AND POSTAL/ZIP CODE) |
| (TELEPHONE NUMBER (BUSINESS HOURS)) | (TELEPHONE NUMBER (BUSINESS HOURS)) |
| (SOCIAL INSURANCE/SECURITY NUMBER) | (SOCIAL INSURANCE/SECURITY NUMBER) |
| (IDENTIFICATION NUMBER)
U.S. residents/citizens must provide their Taxpayer Identification Number

If the funds payable in cash exceed C$25,000,000, they must be wired to you and the Depositary will contact you.

MAIL CHEQUE TO THE ADDRESS ON RECORD (DEFAULT)
MAIL CHEQUE TO A DIFFERENT ADDRESS (MUST COMPLETE BOX “B”)
PAYMENT BY WIRE (MUST COMPLETE BOX “E”)
HOLD CHEQUE FOR PICK-UP AT TSX TRUST COMPANY OFFICE

SEE INSTRUCTION #9 BELOW FOR OFFICE ADDRESSES | |
| BOX C
CURRENCY ELECTION

ALL CASH PAYMENTS WILL BE ISSUED IN CANADIAN DOLLARS UNLESS THE REGISTERED SHAREHOLDER HAS ELECTED, PRIOR TO THE EFFECTIVE DATE, TO RECEIVE PAYMENT IN UNITED STATES DOLLARS. IF DESIRED, PLEASE COMPLETE THE ELECTION BOX BELOW.

☐ Issue my cash entitlement payment(s) in United States dollars

By electing to receive payment in United States dollars instead of Canadian dollars, the undersigned acknowledges and agrees that (a) the exchange rate used to convert the payment(s) from Canadian dollars to United States dollars will be the rate established by TSX Trust, in its capacity as foreign exchange service provider to the Company, on the date that the funds are converted; which rates will be based on the prevailing market rates on such date; (b) the risks associated with the currency conversion from Canadian dollars to United States dollars, including risks relating to change in rates, the timing of exchange or the selection of a rate for exchange, and all costs incurred with the currency conversion will be borne by the undersigned and neither the Company nor TSX Trust nor any of their respective affiliates are responsible for any such matters; and (c) TSX Trust may earn a commercially reasonable spread between its exchange rate and the rate used by any counterparty from which it purchases the elected currency. | |

BOX D
RESIDENCY DECLARATION

ALL SHAREHOLDERS OF THE COMPANY ARE REQUIRED TO COMPLETE A RESIDENCY DECLARATION. FAILURE TO COMPLETE A RESIDENCY DECLARATION MAY RESULT IN A DELAY IN YOUR PAYMENT.

The undersigned represents that:

☐ The beneficial owner of the Company Shares deposited herewith is a resident of Canada for the application of the Tax Act.
☐ The beneficial owner of the Company Shares deposited herewith is a U.S. Shareholder.
☐ The beneficial owner of the Company Shares deposited herewith is not a U.S. Shareholder.

A "U.S. Shareholder" is any Shareholder who is either (i) a person whose address (as it appears on the register of Shareholders of the Company) is located within the United States or any territory or possession thereof or who provides an address in Box A or Box B above that is located within the United States or any territory or possession thereof, or (ii) a "U.S. person" for United States federal income tax purposes as defined in Instruction #8 below. If you are a U.S. person or acting on behalf of a U.S. person, then in order to avoid backup withholding of U.S. federal income tax you must provide a complete IRS Form W-9 (enclosed) below certifying that the U.S. person is not subject to backup withholding or otherwise demonstrate that the U.S. person is exempt from backup withholding, as provided in the instructions (see Instruction #8 below). If you are a U.S. Shareholder but are not included in part (ii) above, you must complete an appropriate IRS Form W-8 in order to avoid being subjected to U.S. backup withholding tax (see Instruction #8 below).

BOX E

WIRE PAYMENT*

*PLEASE NOTE THAT THERE IS A $100 BANKING FEE DEDUCTED ON WIRE PAYMENTS. ALTERNATIVELY, CHEQUE PAYMENTS ARE ISSUED AT NO ADDITIONAL COST.

*IF WIRE DETAILS ARE INCORRECT OR INCOMPLETE, THE DEPOSITARY WILL ATTEMPT TO CONTACT YOU AND CORRECT THE ISSUE. HOWEVER, IF WE CANNOT CORRECT THE ISSUE PROMPTLY, A CHEQUE WILL BE AUTOMATICALLY ISSUED AND MAILED TO THE ADDRESS ON RECORD. NO FEES WILL BE CHARGED.

**Please provide both email address and phone number in order to be contacted to confirm wire instructions:

EMAIL ADDRESS: _____ PHONE NUMBER: _______

**Beneficiary Name(s) that appears on the account at your financial institution – this MUST be the same name and address that your shares are registered to

Beneficiary Address (Note: PO Boxes not accepted)	**City	**Province/State	**Postal Code/Zip Code

**Beneficiary Bank/Financial Institution

Bank Address	**City	**Province/State	**Postal Code/Zip Code

PLEASE ONLY COMPLETE THE APPLICABLE BOXES BELOW, AS PROVIDED BY YOUR FINANCIAL INSTITUTION. YOU ARE NOT REQUIRED TO COMPLETE ALL BOXES

**Bank Account Number	Transit/Routing Number	SWIFT Code	ABA (US)

IBAN Number	Sort Code	BSB Number	BIC Number
---	---	---	---

Additional Notes and special routing instructions (65 characters max.

**Mandatory fields

SHAREHOLDER SIGNATURE(S)

Signature guaranteed by (if required under Instruction #3 below)

Authorized Signature

Name of Guarantor (please print or type)

Address of Guarantor (please print or type)

Dated: _____, 20__

Signature of Shareholder or authorized representative (see Instructions #2 and #4 below)

Address (please print or type)

Name of Shareholder (please print or type)

Telephone No

Name of authorized representative, if applicable (please print or type)

INSTRUCTIONS

1. Use and Delivery of Letter of Transmittal

This Letter of Transmittal duly completed and executed (or an originally executed facsimile copy thereof), together with the accompanying certificates or DRS Statement(s), as applicable, representing the Company Shares, must be received by the Depositary at the office specified on the back cover of the Letter of Transmittal before the Effective Date.

The method used to deliver this Letter of Transmittal and any accompanying certificate(s) or DRS Statement(s), as applicable, representing Company Shares and all other documents or other necessary information or confirmation for a book-entry transfer is at the option and risk of the holder, and delivery will be deemed effective only when such documents are actually received by the Depositary at its office in Toronto. The Company and the Purchaser recommend that the necessary documentation be hand delivered to the Depositary and that a receipt be obtained; otherwise the use of registered mail with return receipt requested, properly insured, is recommended.

2. Signatures

This Letter of Transmittal must be filled in and executed by the Registered Shareholder described above or by such holder's duly authorized representative (in accordance with Instruction #4 below).

a. If this Letter of Transmittal is executed by the Registered Shareholder, such signature(s) on this Letter of Transmittal must correspond with the names(s) as registered or as written on the face of the certificate(s) or DRS Statement(s), as applicable, representing the Company Shares, without any change whatsoever, and the certificate(s) or DRS Statement(s), as applicable, need not be endorsed. If the deposited certificate(s) or DRS Statement(s), as applicable, evidence Company Shares that are owned of record by two or more joint owners, all such owners must sign the Letter of Transmittal.

b. If this Letter of Transmittal is executed by a person other than the Registered Shareholder(s):

i. the deposited certificate(s) or DRS Statement(s), as applicable, must be endorsed or be accompanied by an appropriate share transfer power of attorney duly and properly completed by the Registered Shareholder(s);

ii. the signature(s) on such endorsement or share transfer power of attorney must correspond exactly to the name(s) of the Registered Shareholder(s) as registered or as appearing on the certificate(s) or DRS Statement(s), as applicable, and must be guaranteed as noted in Instruction #3 below.

3. Guarantee of Signatures

If this Letter of Transmittal is executed by a person other than the Registered Shareholder(s) of the Company Shares, or if Company Shares not purchased (for any reason) are to be returned to a person other than such Registered Shareholder(s) or if the payment is to be issued in the name of a person other than the Registered Shareholder of the Company Shares, such signature on the share certificate(s), DRS Statement(s) or a separate security transfer form must be guaranteed by an Eligible Institution (as defined below), or in some other manner satisfactory to the Depositary (except that no guarantee is required if the signature is that of an Eligible Institution).

An "Eligible Institution" means a Canadian Schedule I chartered bank, a member of the Securities Transfer Association Medallion Program (the "STAMP"), a member of the Stock Exchange Medallion Program (the "SEMP") or a member of the New York Stock Exchange Inc. Medallion Signature Program (the "MSP"). Members of the STAMP, the SEMP or the MSP are usually members of a recognized stock exchange in Canada or the United States, members of the Canadian Investment Regulatory Organization, members of the Financial Industry Regulatory Authority or banks and trust companies in the United States.

4. Fiduciaries, Representatives and Authorizations

Where this Letter of Transmittal is executed by a person on behalf of an executor, administrator, trustee, guardian, corporation, partnership or association or is executed by any other person acting in a representative capacity, this Letter of Transmittal must be accompanied by satisfactory evidence of the authority to act. Either the Company, the Purchaser or the Depositary, at its discretion, may require additional evidence of authority or additional documentation.

Miscellaneous

a. If the space provided in this Letter is insufficient, the requested information should be set out on a separate list and attached to this Letter.

b. If Company Shares are registered in different forms (e.g. "John Doe" and "J. Doe") a separate Letter of Transmittal should be executed for each different registration.

c. No alternative, conditional or contingent deposits will be accepted.

d. Additional copies of the Circular and this Letter of Transmittal may be obtained from the Depositary at its office listed below. Copies of the Circular and this Letter of Transmittal are also available on SEDAR+ (www.sedarplus.ca) under the Company's issuer profile.

e. The Company and the Purchaser reserve the right, if they so elect, in their absolute discretion, to instruct the Depositary to waive any defect or irregularity contained in any Letter of Transmittal received by the Depositary. You agree that any determination made by the Purchaser or the Company as to validity, form and eligibility and acceptance of the Company Shares will be final and binding. There will be no duty or obligation of the Purchaser, the Company or the Depositary to give notice of any defect or irregularity in any deposit and no liability will be incurred for failure to do so. The granting of a waiver to one or more Registered Shareholders does not constitute a waiver for any other Registered Shareholders.

f. Before completing this Letter of Transmittal, you are urged to read the accompanying Circular and discuss any questions with financial, legal and/or tax advisors.

Lost, Stolen or Destroyed Certificates

If a certificate representing Company Shares has been lost, destroyed or stolen, this Letter should be completed as fully as possible and forwarded, together with a letter describing the loss, destruction or theft, to the Depositary. The Registered Shareholder will be required to complete and submit certain documentation, including an affidavit and a bond and/or indemnity, before payment for the Company Shares can be received by the Registered Shareholder.

If a DRS Statement representing Company Shares has been lost, stolen or destroyed, the holder can request a copy of the DRS Statement by contacting TSX Trust Company by phone: toll-free in North America at 1-866-600-5869 (toll-free within North America) or 1-416-342-1091 (outside of North America), with no bond indemnity required and such copy of the DRS Statement should be deposited with the Letter of Transmittal.

Return of Certificates

If the Arrangement does not proceed for any reason, the enclosed certificate(s) or DRS Statement(s), as applicable, representing the Company Shares and other relevant documents will be returned forthwith to the undersigned in accordance with the delivery instructions in this Letter of Transmittal, or failing such address being specified, to the undersigned at the last address of the undersigned as it appears on the register of the Company maintained by TSX Trust, in its capacity as transfer agent and registrar of the Company, or in the case of Company Shares delivered by book-entry transfer, the Depositary will credit the Company Shares to the applicable account.

U.S. Shareholders and Backup Withholding

The following does not constitute a summary of the tax consequences with respect to the disposition of Company Shares pursuant to the Arrangement. Registered Shareholders should review the Circular and consult their own tax advisors having regard to their own particular circumstances to determine the particular tax consequences to them of a disposition of Company Shares pursuant to the Arrangement.

In order to avoid "backup withholding" of United States federal income tax on payments made with respect to the disposition of Company Shares pursuant to the Arrangement, a Shareholder that is a U.S. Shareholder (as defined in Box D above) must generally provide the person's correct taxpayer identification number ("TIN") on the IRS Form W-9 included herewith and certify, under penalties of perjury, that (a) such TIN is correct (or that such U.S. holder is awaiting a TIN), (b) such U.S. Shareholder is not subject to backup withholding because (i) such U.S. Shareholder has not been notified by the United States Internal Revenue Service (the "IRS") that such U.S. Shareholder is subject to backup withholding as a result of a failure to report all interest or dividends, (ii) the IRS has notified such U.S. Shareholder that he, she or it is no longer subject to backup withholding, or (iii) such U.S. Shareholder is exempt from backup withholding, and (c)

such U.S. Shareholder is a U.S. person (as defined below) (including a U.S. resident alien). The TIN for an individual United States citizen or resident is the individual's social security number. If the correct TIN is not provided or if any other information is not correctly provided, payments made with respect to the disposition of Company Shares may be subject to backup withholding at the applicable statutory rate (currently 24%).

For the purposes of this Letter of Transmittal, a "U.S. holder" or "U.S. person" means: a beneficial owner of Company Shares that, for United States federal income tax purposes, is (a) an individual citizen or resident of the United States, (b) a corporation, or other entity classified as a corporation for United States federal income tax purposes, that is created or organized in or under the laws of the United States, any state thereof or the District of Columbia, (c) an estate if the income of such estate is subject to United States federal income tax regardless of the source of such income, (d) a trust if (i) such trust has validly elected to be treated as a U.S. person for United States federal income tax purposes or (ii) a United States court is able to exercise primary supervision over the administration of such trust and one or more U.S. persons have the authority to control all substantial decisions of such trust, or (e) a partnership, limited liability company or other entity classified as a partnership for United States federal income tax purposes that is created or organized in or under the laws of the United States, any state thereof or the District of Columbia.

Backup withholding is not an additional United States federal income tax. Rather, the United States federal income tax liability of persons subject to backup withholding will be reduced by the amount withheld. If backup withholding results in an overpayment of taxes, a refund may be obtained provided that the required information is properly and timely furnished to the IRS.

Certain persons (including, among others, corporations, certain "not-for-profit" organizations, and certain non-U.S. persons) are not subject to backup withholding. To prevent possible erroneous backup withholding, an exempt Shareholder that is a U.S. holder should complete IRS Form W-9, including the "Exemptions" field in Box 4 on the IRS Form W-9. See the W-9 Specific Instructions for additional instructions. A Shareholder should consult his, her or its tax advisor as to the Shareholder's qualification for an exemption from backup withholding and the procedure for obtaining such exemption.

If a U.S. holder does not have a TIN, such U.S. holder should: (a) consult the W-9 Instructions for instructions as to how to apply for a TIN; (b) write "Applied For" in the space for the TIN in Part I of IRS Form W-9; and (c) sign and date IRS Form W-9. The Depositary may withhold on all payments made prior to the time a properly certified TIN is provided to it. A U.S. holder who writes "Applied For" in Part I of IRS Form W-9 should furnish the Depositary with such U.S. Shareholder's TIN as soon as it is received. In such case, the Depositary may withhold a portion of the gross proceeds of any payment made to such U.S. holder prior to the time a properly certified TIN is provided to the Depositary, and if the Depositary is not provided with a TIN within 60 days, such amounts will be paid over to the IRS.

Failure to furnish TIN — If you fail to furnish your correct TIN, you are subject to a penalty of US$50 for each such failure unless your failure is due to reasonable cause and not to willful neglect.

Shareholders that are not U.S. holders that receive payments in the U.S. or that provide an address located in the U.S. should return a properly completed IRS Form W-8 that is appropriate to the non-U.S. holder's circumstances, a copy of which is available from the Depositary upon request, or at https://www.irs.gov/forms-pubs/about-form-w-8. All non-U.S. holders should consult their own tax advisors regarding the appropriate IRS Form W-8 to be provided by such non-U.S. holder. Failure to provide the proper IRS Form W-8 could result in backup withholding at the applicable statutory rate (currently 24%).

All Shareholders are urged to consult their own tax advisors to determine which forms should be used and whether they are exempt from U.S. backup withholding.

9. Payment Entitlement Pick-up Locations

The Depositary will mail the Consideration payable to such Registered Shareholder in accordance with the information provided in Box "A" or Box "B", as applicable. If Box "A" or, as applicable, Box "B", are not properly completed, any cheques representing the Consideration will be issued in the name of the Registered Shareholder and mailed to the address of the Registered Shareholder as it appears on the register of the Company's transfer agent. Any cheques representing the Consideration mailed in accordance with this Letter of Transmittal will be deemed to be delivered at the time of mailing.

Entitlements may be picked up at applicable TSX Trust office locations with Counter services. Pick-up instructions must be selected in Box "A". Below are the applicable TSX Trust office locations:

Toronto

100 Adelaide Street West
Suite 301
Toronto, Ontario
M5H 4H1

Privacy Notice

The Depositary is committed to protecting personal information received from its clients. In the course of providing services to its clients, the Depositary receives certain non-public personal information. This information could include an individual's name, address, social insurance number, securities holdings and other financial information. The Depositary uses this information for lawful purposes relating to its services. The Depositary has prepared a privacy code relating to information practices and privacy protection, which can be obtained by sending a written request to the Depositary at the following address: Chief Privacy Officer, TSX Trust Company, 301-100 Adelaide St. West, Toronto, Ontario, M5H 4H1. The Depositary will use the information provided on this form in order to process the Registered Shareholder's request and will treat the Registered Shareholder's signature(s) on this form as his, her or its consent to the above.

If you need assistance in completing this Letter of Transmittal, please contact TSX Trust Company at 1-416-342-1091, toll-free in North America at 1-866-600-5869 or by email at [email protected], or contact your professional advisor.

IRS FORM W-9

(See attached)

Note: Please review carefully Instruction #8 above regarding backup withholding before completing the IRS FORM W-9 on the following pages.

Form W-9 (Rev. March 2024)
Department of the Treasury
Internal Revenue Service
Request for Taxpayer Identification Number and Certification
Go to www.irs.gov/FormW9 for instructions and the latest information.
Give form to the requester. Do not send to the IRS.

Before you begin. For guidance related to the purpose of Form W-9, see Purpose of Form, below.

| Print or type.
See Specific Instructions on page 3. | 1 Name of entity/individual. An entry is required. (For a sole proprietor or disregarded entity, enter the owner's name on line 1, and enter the business/disregarded entity's name on line 2.) | | |
| --- | --- | --- | --- |
| | 2 Business name/disregarded entity name, if different from above. | | |
| | 3a Check the appropriate box for federal tax classification of the entity/individual whose name is entered on line 1. Check only one of the following seven boxes.
☐ Individual/sole proprietor ☐ C corporation ☐ S corporation ☐ Partnership ☐ Trust/estate
☐ LLC. Enter the tax classification (C = C corporation, S = S corporation, P = Partnership)
Note: Check the “LLC” box above and, in the entry space, enter the appropriate code (C, S, or P) for the tax classification of the LLC, unless it is a disregarded entity. A disregarded entity should instead check the appropriate box for the tax classification of its owner.
☐ Other (see instructions) | | 4 Exemptions (codes apply only to certain entities, not individuals; see instructions on page 3):
Exempt payee code (if any)
Exemption from Foreign Account Tax Compliance Act (FATCA) reporting code (if any)
(Applies to accounts maintained outside the United States.) |
| | 5 Address (number, street, and apt. or suite no.). See instructions. | Requester's name and address (optional) | |
| | 6 City, state, and ZIP code | | |
| | 7 List account number(s) here (optional) | | |

Part I Taxpayer Identification Number (TIN)

Enter your TIN in the appropriate box. The TIN provided must match the name given on line 1 to avoid backup withholding. For individuals, this is generally your social security number (SSN). However, for a resident alien, sole proprietor, or disregarded entity, see the instructions for Part I, later. For other entities, it is your employer identification number (EIN). If you do not have a number, see How to get a TIN, later.

Note: If the account is in more than one name, see the instructions for line 1. See also What Name and Number To Give the Requester for guidelines on whose number to enter.

Social security number
		-	-
or
Employer identification number
	-

Part II Certification

Under penalties of perjury, I certify that:

The number shown on this form is my correct taxpayer identification number (or I am waiting for a number to be issued to me); and
I am not subject to backup withholding because (a) I am exempt from backup withholding, or (b) I have not been notified by the Internal Revenue Service (IRS) that I am subject to backup withholding as a result of a failure to report all interest or dividends, or (c) the IRS has notified me that I am no longer subject to backup withholding; and
I am a U.S. citizen or other U.S. person (defined below); and
The FATCA code(s) entered on this form (if any) indicating that I am exempt from FATCA reporting is correct.

Certification instructions. You must cross out item 2 above if you have been notified by the IRS that you are currently subject to backup withholding because you have failed to report all interest and dividends on your tax return. For real estate transactions, item 2 does not apply. For mortgage interest paid, acquisition or abandonment of secured property, cancellation of debt, contributions to an individual retirement arrangement (IRA), and, generally, payments other than interest and dividends, you are not required to sign the certification, but you must provide your correct TIN. See the instructions for Part II, later.

Sign Here	Signature of U.S. person	Date

General Instructions

Section references are to the Internal Revenue Code unless otherwise noted.

Future developments. For the latest information about developments related to Form W-9 and its instructions, such as legislation enacted after they were published, go to www.irs.gov/FormW9.

What's New

Line 3a has been modified to clarify how a disregarded entity completes this line. An LLC that is a disregarded entity should check the appropriate box for the tax classification of its owner. Otherwise, it should check the “LLC” box and enter its appropriate tax classification.

New line 3b has been added to this form. A flow-through entity is required to complete this line to indicate that it has direct or indirect foreign partners, owners, or beneficiaries when it provides the Form W-9 to another flow-through entity in which it has an ownership interest. This change is intended to provide a flow-through entity with information regarding the status of its indirect foreign partners, owners, or beneficiaries, so that it can satisfy any applicable reporting requirements. For example, a partnership that has any indirect foreign partners may be required to complete Schedules K-2 and K-3. See the Partnership Instructions for Schedules K-2 and K-3 (Form 1065).

Purpose of Form

An individual or entity (Form W-9 requester) who is required to file an information return with the IRS is giving you this form because they

Cat. No. 10231X
Form W-9 (Rev. 3-2024)

must obtain your correct taxpayer identification number (TIN), which may be your social security number (SSN), individual taxpayer identification number (ITIN), adoption taxpayer identification number (ATIN), or employer identification number (EIN), to report on an information return the amount paid to you, or other amount reportable on an information return. Examples of information returns include, but are not limited to, the following.

• Form 1099-INT (interest earned or paid).

• Form 1099-DIV (dividends, including those from stocks or mutual funds).

• Form 1099-MISC (various types of income, prizes, awards, or gross proceeds).

• Form 1099-NEC (nonemployee compensation).

• Form 1099-B (stock or mutual fund sales and certain other transactions by brokers).

• Form 1099-S (proceeds from real estate transactions).

• Form 1099-K (merchant card and third-party network transactions).

• Form 1098 (home mortgage interest), 1098-E (student loan interest), and 1098-T (tuition).

• Form 1099-C (canceled debt).

• Form 1099-A (acquisition or abandonment of secured property).

Use Form W-9 only if you are a U.S. person (including a resident alien), to provide your correct TIN.

Caution: If you don't return Form W-9 to the requester with a TIN, you might be subject to backup withholding. See What is backup withholding, later.

By signing the filled-out form, you:

Certify that the TIN you are giving is correct (or you are waiting for a number to be issued);
Certify that you are not subject to backup withholding; or
Claim exemption from backup withholding if you are a U.S. exempt payee; and
Certify to your non-foreign status for purposes of withholding under chapter 3 or 4 of the Code (if applicable); and
Certify that FATCA code(s) entered on this form (if any) indicating that you are exempt from the FATCA reporting is correct. See What Is FATCA Reporting, later, for further information.

Note: If you are a U.S. person and a requester gives you a form other than Form W-9 to request your TIN, you must use the requester's form if it is substantially similar to this Form W-9.

Definition of a U.S. person. For federal tax purposes, you are considered a U.S. person if you are:

• An individual who is a U.S. citizen or U.S. resident alien;

• A partnership, corporation, company, or association created or organized in the United States or under the laws of the United States;

• An estate (other than a foreign estate); or

• A domestic trust (as defined in Regulations section 301.7701-7).

Establishing U.S. status for purposes of chapter 3 and chapter 4 withholding. Payments made to foreign persons, including certain distributions, allocations of income, or transfers of sales proceeds, may be subject to withholding under chapter 3 or chapter 4 of the Code (sections 1441--1474). Under those rules, if a Form W-9 or other certification of non-foreign status has not been received, a withholding agent, transferee, or partnership (payor) generally applies presumption rules that may require the payor to withhold applicable tax from the recipient, owner, transferor, or partner (payee). See Pub. 515, Withholding of Tax on Nonresident Aliens and Foreign Entities.

The following persons must provide Form W-9 to the payor for purposes of establishing its non-foreign status.

• In the case of a disregarded entity with a U.S. owner, the U.S. owner of the disregarded entity and not the disregarded entity.

• In the case of a grantor trust with a U.S. grantor or other U.S. owner, generally, the U.S. grantor or other U.S. owner of the grantor trust and not the grantor trust.

• In the case of a U.S. trust (other than a grantor trust), the U.S. trust and not the beneficiaries of the trust.

See Pub. 515 for more information on providing a Form W-9 or a certification of non-foreign status to avoid withholding.

Foreign person. If you are a foreign person or the U.S. branch of a foreign bank that has elected to be treated as a U.S. person (under Regulations section 1.1441-1(b)(2)(iv) or other applicable section for chapter 3 or 4 purposes), do not use Form W-9. Instead, use the appropriate Form W-8 or Form 8233 (see Pub. 515). If you are a qualified foreign pension fund under Regulations section 1.897(l)-1(d), or a partnership that is wholly owned by qualified foreign pension funds, that is treated as a non-foreign person for purposes of section 1445 withholding, do not use Form W-9. Instead, use Form W-8EXP (or other certification of non-foreign status).

Nonresident alien who becomes a resident alien. Generally, only a nonresident alien individual may use the terms of a tax treaty to reduce or eliminate U.S. tax on certain types of income. However, most tax treaties contain a provision known as a saving clause. Exceptions specified in the saving clause may permit an exemption from tax to continue for certain types of income even after the payee has otherwise become a U.S. resident alien for tax purposes.

If you are a U.S. resident alien who is relying on an exception contained in the saving clause of a tax treaty to claim an exemption from U.S. tax on certain types of income, you must attach a statement to Form W-9 that specifies the following five items.

The treaty country. Generally, this must be the same treaty under which you claimed exemption from tax as a nonresident alien.
The treaty article addressing the income.
The article number (or location) in the tax treaty that contains the saving clause and its exceptions.
The type and amount of income that qualifies for the exemption from tax.
Sufficient facts to justify the exemption from tax under the terms of the treaty article.

Example. Article 20 of the U.S.-China income tax treaty allows an exemption from tax for scholarship income received by a Chinese student temporarily present in the United States. Under U.S. law, this student will become a resident alien for tax purposes if their stay in the United States exceeds 5 calendar years. However, paragraph 2 of the first Protocol to the U.S.-China treaty (dated April 30, 1984) allows the provisions of Article 20 to continue to apply even after the Chinese student becomes a resident alien of the United States. A Chinese student who qualifies for this exception (under paragraph 2 of the first Protocol) and is relying on this exception to claim an exemption from tax on their scholarship or fellowship income would attach to Form W-9 a statement that includes the information described above to support that exemption.

If you are a nonresident alien or a foreign entity, give the requester the appropriate completed Form W-8 or Form 8233.

Backup Withholding

What is backup withholding? Persons making certain payments to you must under certain conditions withhold and pay to the IRS 24% of such payments. This is called “backup withholding.” Payments that may be subject to backup withholding include, but are not limited to, interest, tax-exempt interest, dividends, broker and barter exchange transactions, rents, royalties, nonemployee pay, payments made in settlement of payment card and third-party network transactions, and certain payments from fishing boat operators. Real estate transactions are not subject to backup withholding.

You will not be subject to backup withholding on payments you receive if you give the requester your correct TIN, make the proper certifications, and report all your taxable interest and dividends on your tax return.

Payments you receive will be subject to backup withholding if:

You do not furnish your TIN to the requester;
You do not certify your TIN when required (see the instructions for Part II for details);
The IRS tells the requester that you furnished an incorrect TIN;
The IRS tells you that you are subject to backup withholding because you did not report all your interest and dividends on your tax return (for reportable interest and dividends only); or
You do not certify to the requester that you are not subject to backup withholding, as described in item 4 under “By signing the filled-out form” above (for reportable interest and dividend accounts opened after 1983 only).

Form W-9 (Rev. 3-2024)
Page 3

Certain payees and payments are exempt from backup withholding. See Exempt payee code, later, and the separate Instructions for the Requester of Form W-9 for more information.

See also Establishing U.S. status for purposes of chapter 3 and chapter 4 withholding, earlier.

What Is FATCA Reporting?

The Foreign Account Tax Compliance Act (FATCA) requires a participating foreign financial institution to report all U.S. account holders that are specified U.S. persons. Certain payees are exempt from FATCA reporting. See Exemption from FATCA reporting code, later, and the Instructions for the Requester of Form W-9 for more information.

Updating Your Information

You must provide updated information to any person to whom you claimed to be an exempt payee if you are no longer an exempt payee and anticipate receiving reportable payments in the future from this person. For example, you may need to provide updated information if you are a C corporation that elects to be an S corporation, or if you are no longer tax exempt. In addition, you must furnish a new Form W-9 if the name or TIN changes for the account, for example, if the grantor of a grantor trust dies.

Penalties

Failure to furnish TIN. If you fail to furnish your correct TIN to a requester, you are subject to a penalty of $50 for each such failure unless your failure is due to reasonable cause and not to willful neglect.

Civil penalty for false information with respect to withholding. If you make a false statement with no reasonable basis that results in no backup withholding, you are subject to a $500 penalty.

Criminal penalty for falsifying information. Willfully falsifying certifications or affirmations may subject you to criminal penalties including fines and/or imprisonment.

Misuse of TINs. If the requester discloses or uses TINs in violation of federal law, the requester may be subject to civil and criminal penalties.

Specific Instructions

Line 1

You must enter one of the following on this line; do not leave this line blank. The name should match the name on your tax return.

If this Form W-9 is for a joint account (other than an account maintained by a foreign financial institution (FFI)), list first, and then circle, the name of the person or entity whose number you entered in Part I of Form W-9. If you are providing Form W-9 to an FFI to document a joint account, each holder of the account that is a U.S. person must provide a Form W-9.

Individual. Generally, enter the name shown on your tax return. If you have changed your last name without informing the Social Security Administration (SSA) of the name change, enter your first name, the last name as shown on your social security card, and your new last name.

Note for ITIN applicant: Enter your individual name as it was entered on your Form W-7 application, line 1a. This should also be the same as the name you entered on the Form 1040 you filed with your application.

Sole proprietor. Enter your individual name as shown on your Form 1040 on line 1. Enter your business, trade, or "doing business as" (DBA) name on line 2.
Partnership, C corporation, S corporation, or LLC, other than a disregarded entity. Enter the entity's name as shown on the entity's tax return on line 1 and any business, trade, or DBA name on line 2.
Other entities. Enter your name as shown on required U.S. federal tax documents on line 1. This name should match the name shown on the charter or other legal document creating the entity. Enter any business, trade, or DBA name on line 2.
Disregarded entity. In general, a business entity that has a single owner, including an LLC, and is not a corporation, is disregarded as an entity separate from its owner (a disregarded entity). See Regulations section 301.7701-2(c)(2). A disregarded entity should check the appropriate box for the tax classification of its owner. Enter the owner's name on line 1. The name of the owner entered on line 1 should never be a disregarded entity. The name on line 1 should be the name shown on the income tax return on which the income should be reported. For example, if a foreign LLC that is treated as a disregarded entity for U.S. federal tax purposes has a single owner that is a U.S. person, the U.S. owner's name is required to be provided on line 1. If the direct owner of the entity is also a disregarded entity, enter the first owner that is not disregarded for federal tax purposes. Enter the disregarded entity's name on line 2. If the owner of the disregarded entity is a foreign person, the owner must complete an appropriate Form W-8 instead of a Form W-9. This is the case even if the foreign person has a U.S. TIN.

Line 2

If you have a business name, trade name, DBA name, or disregarded entity name, enter it on line 2.

Line 3a

Check the appropriate box on line 3a for the U.S. federal tax classification of the person whose name is entered on line 1. Check only one box on line 3a.

IF the entity/individual on line 1 is a(n) . . .	THEN check the box for . . .
• Corporation	Corporation.
• Individual or
• Sole proprietorship	Individual/sole proprietor.
• LLC classified as a partnership for U.S. federal tax purposes or
• LLC that has filed Form 8832 or 2553 electing to be taxed as a corporation	Limited liability company and enter the appropriate tax classification:
P = Partnership,
C = C corporation, or
S = S corporation.
• Partnership	Partnership.
• Trust/estate	Trust/estate.

Line 3b

Check this box if you are a partnership (including an LLC classified as a partnership for U.S. federal tax purposes), trust, or estate that has any foreign partners, owners, or beneficiaries, and you are providing this form to a partnership, trust, or estate, in which you have an ownership interest. You must check the box on line 3b if you receive a Form W-8 (or documentary evidence) from any partner, owner, or beneficiary establishing foreign status or if you receive a Form W-9 from any partner, owner, or beneficiary that has checked the box on line 3b.

Note: A partnership that provides a Form W-9 and checks box 3b may be required to complete Schedules K-2 and K-3 (Form 1065). For more information, see the Partnership Instructions for Schedules K-2 and K-3 (Form 1065).

If you are required to complete line 3b but fail to do so, you may not receive the information necessary to file a correct information return with the IRS or furnish a correct payee statement to your partners or beneficiaries. See, for example, sections 6698, 6722, and 6724 for penalties that may apply.

Line 4 Exemptions

If you are exempt from backup withholding and/or FATCA reporting, enter in the appropriate space on line 4 any code(s) that may apply to you.

Exempt payee code.

Generally, individuals (including sole proprietors) are not exempt from backup withholding.
Except as provided below, corporations are exempt from backup withholding for certain payments, including interest and dividends.
Corporations are not exempt from backup withholding for payments made in settlement of payment card or third-party network transactions.
Corporations are not exempt from backup withholding with respect to attorneys' fees or gross proceeds paid to attorneys, and corporations that provide medical or health care services are not exempt with respect to payments reportable on Form 1099-MISC.

The following codes identify payees that are exempt from backup withholding. Enter the appropriate code in the space on line 4.

1—An organization exempt from tax under section 501(a), any IRA, or a custodial account under section 403(b)(7) if the account satisfies the requirements of section 401(f)(2).

Form W-9 (Rev. 3-2024)
Page 4

2—The United States or any of its agencies or instrumentalities.
3—A state, the District of Columbia, a U.S. commonwealth or territory, or any of their political subdivisions or instrumentalities.
4—A foreign government or any of its political subdivisions, agencies, or instrumentalities.
5—A corporation.
6—A dealer in securities or commodities required to register in the United States, the District of Columbia, or a U.S. commonwealth or territory.
7—A futures commission merchant registered with the Commodity Futures Trading Commission.
8—A real estate investment trust.
9—An entity registered at all times during the tax year under the Investment Company Act of 1940.
10—A common trust fund operated by a bank under section 584(a).
11—A financial institution as defined under section 581.
12—A middleman known in the investment community as a nominee or custodian.
13—A trust exempt from tax under section 664 or described in section 4947.

The following chart shows types of payments that may be exempt from backup withholding. The chart applies to the exempt payees listed above, 1 through 13.

IF the payment is for . . .	THEN the payment is exempt for . . .
• Interest and dividend payments	All exempt payees except for 7.
• Broker transactions	Exempt payees 1 through 4 and 6 through 11 and all C corporations. S corporations must not enter an exempt payee code because they are exempt only for sales of noncovered securities acquired prior to 2012.
• Barter exchange transactions and patronage dividends	Exempt payees 1 through 4.
• Payments over $600 required to be reported and direct sales over $5,000¹	Generally, exempt payees 1 through 5.²
• Payments made in settlement of payment card or third-party network transactions	Exempt payees 1 through 4.

¹ See Form 1099-MISC, Miscellaneous Information, and its instructions.
² However, the following payments made to a corporation and reportable on Form 1099-MISC are not exempt from backup withholding: medical and health care payments, attorneys' fees, gross proceeds paid to an attorney reportable under section 6045(f), and payments for services paid by a federal executive agency.

Exemption from FATCA reporting code. The following codes identify payees that are exempt from reporting under FATCA. These codes apply to persons submitting this form for accounts maintained outside of the United States by certain foreign financial institutions. Therefore, if you are only submitting this form for an account you hold in the United States, you may leave this field blank. Consult with the person requesting this form if you are uncertain if the financial institution is subject to these requirements. A requester may indicate that a code is not required by providing you with a Form W-9 with "Not Applicable" (or any similar indication) entered on the line for a FATCA exemption code.

A—An organization exempt from tax under section 501(a) or any individual retirement plan as defined in section 7701(a)(37).
B—The United States or any of its agencies or instrumentalities.
C—A state, the District of Columbia, a U.S. commonwealth or territory, or any of their political subdivisions or instrumentalities.
D—A corporation the stock of which is regularly traded on one or more established securities markets, as described in Regulations section 1.1472-1(c)(1)(i).
E—A corporation that is a member of the same expanded affiliated group as a corporation described in Regulations section 1.1472-1(c)(1)(i).

F—A dealer in securities, commodities, or derivative financial instruments (including notional principal contracts, futures, forwards, and options) that is registered as such under the laws of the United States or any state.
G—A real estate investment trust.
H—A regulated investment company as defined in section 851 or an entity registered at all times during the tax year under the Investment Company Act of 1940.
I—A common trust fund as defined in section 584(a).
J—A bank as defined in section 581.
K—A broker.
L—A trust exempt from tax under section 664 or described in section 4947(a)(1).
M—A tax-exempt trust under a section 403(b) plan or section 457(g) plan.

Note: You may wish to consult with the financial institution requesting this form to determine whether the FATCA code and/or exempt payee code should be completed.

Line 5

Enter your address (number, street, and apartment or suite number). This is where the requester of this Form W-9 will mail your information returns. If this address differs from the one the requester already has on file, enter "NEW" at the top. If a new address is provided, there is still a chance the old address will be used until the payor changes your address in their records.

Line 6

Enter your city, state, and ZIP code.

Part I. Taxpayer Identification Number (TIN)

Enter your TIN in the appropriate box. If you are a resident alien and you do not have, and are not eligible to get, an SSN, your TIN is your IRS ITIN. Enter it in the entry space for the Social security number. If you do not have an ITIN, see How to get a TIN below.

If you are a sole proprietor and you have an EIN, you may enter either your SSN or EIN.

If you are a single-member LLC that is disregarded as an entity separate from its owner, enter the owner's SSN (or EIN, if the owner has one). If the LLC is classified as a corporation or partnership, enter the entity's EIN.

Note: See What Name and Number To Give the Requester, later, for further clarification of name and TIN combinations.

How to get a TIN. If you do not have a TIN, apply for one immediately. To apply for an SSN, get Form SS-5, Application for a Social Security Card, from your local SSA office or get this form online at www.SSA.gov. You may also get this form by calling 800-772-1213. Use Form W-7, Application for IRS Individual Taxpayer Identification Number, to apply for an ITIN, or Form SS-4, Application for Employer Identification Number, to apply for an EIN. You can apply for an EIN online by accessing the IRS website at www.irs.gov/EIN. Go to www.irs.gov/Forms to view, download, or print Form W-7 and/or Form SS-4. Or, you can go to www.irs.gov/OrderForms to place an order and have Form W-7 and/or Form SS-4 mailed to you within 15 business days.

If you are asked to complete Form W-9 but do not have a TIN, apply for a TIN and enter "Applied For" in the space for the TIN, sign and date the form, and give it to the requester. For interest and dividend payments, and certain payments made with respect to readily tradable instruments, you will generally have 60 days to get a TIN and give it to the requester before you are subject to backup withholding on payments. The 60-day rule does not apply to other types of payments. You will be subject to backup withholding on all such payments until you provide your TIN to the requester.

Note: Entering "Applied For" means that you have already applied for a TIN or that you intend to apply for one soon. See also Establishing U.S. status for purposes of chapter 3 and chapter 4 withholding, earlier, for when you may instead be subject to withholding under chapter 3 or 4 of the Code.

Caution: A disregarded U.S. entity that has a foreign owner must use the appropriate Form W-8.

Form W-9 (Rev. 3-2024)
Page 5

Part II. Certification

To establish to the withholding agent that you are a U.S. person, or resident alien, sign Form W-9. You may be requested to sign by the withholding agent even if item 1, 4, or 5 below indicates otherwise.

For a joint account, only the person whose TIN is shown in Part I should sign (when required). In the case of a disregarded entity, the person identified on line 1 must sign. Exempt payees, see Exempt payee code, earlier.

Signature requirements. Complete the certification as indicated in items 1 through 5 below.

Interest, dividend, and barter exchange accounts opened before 1984 and broker accounts considered active during 1983. You must give your correct TIN, but you do not have to sign the certification.
Interest, dividend, broker, and barter exchange accounts opened after 1983 and broker accounts considered inactive during 1983. You must sign the certification or backup withholding will apply. If you are subject to backup withholding and you are merely providing your correct TIN to the requester, you must cross out item 2 in the certification before signing the form.
Real estate transactions. You must sign the certification. You may cross out item 2 of the certification.
Other payments. You must give your correct TIN, but you do not have to sign the certification unless you have been notified that you have previously given an incorrect TIN. "Other payments" include payments made in the course of the requester's trade or business for rents, royalties, goods (other than bills for merchandise), medical and health care services (including payments to corporations), payments to a nonemployee for services, payments made in settlement of payment card and third-party network transactions, payments to certain fishing boat crew members and fishermen, and gross proceeds paid to attorneys (including payments to corporations).
Mortgage interest paid by you, acquisition or abandonment of secured property, cancellation of debt, qualified tuition program payments (under section 529), ABLE accounts (under section 529A), IRA, Coverdell ESA, Archer MSA or HSA contributions or distributions, and pension distributions. You must give your correct TIN, but you do not have to sign the certification.

What Name and Number To Give the Requester

For this type of account:	Give name and SSN of:
1. Individual	The individual
2. Two or more individuals (joint account) other than an account maintained by an FFI	The actual owner of the account or, if combined funds, the first individual on the account^{1}
3. Two or more U.S. persons (joint account maintained by an FFI)	Each holder of the account
4. Custodial account of a minor (Uniform Gift to Minors Act)	The minor^{2}
5. a. The usual revocable savings trust (grantor is also trustee)	The grantor-trustee^{1}
b. So-called trust account that is not a legal or valid trust under state law	The actual owner^{1}
6. Sole proprietorship or disregarded entity owned by an individual	The owner^{3}
7. Grantor trust filing under Optional Filing Method 1 (see Regulations section 1.671-4(b)(2)(i)(A))^{**}	The grantor^{*}
For this type of account:	Give name and EIN of:
---	---
8. Disregarded entity not owned by an individual	The owner
9. A valid trust, estate, or pension trust	Legal entity^{4}
10. Corporation or LLC electing corporate status on Form 8832 or Form 2553	The corporation
11. Association, club, religious, charitable, educational, or other tax-exempt organization	The organization
12. Partnership or multi-member LLC	The partnership
13. A broker or registered nominee	The broker or nominee
14. Account with the Department of Agriculture in the name of a public entity (such as a state or local government, school district, or prison) that receives agricultural program payments	The public entity
15. Grantor trust filing Form 1041 or under the Optional Filing Method 2, requiring Form 1099 (see Regulations section 1.671-4(b)(2)(i)(B))^{**}	The trust

List first and circle the name of the person whose number you furnish. If only one person on a joint account has an SSN, that person's number must be furnished.
Circle the minor's name and furnish the minor's SSN.
You must show your individual name on line 1, and enter your business or DBA name, if any, on line 2. You may use either your SSN or EIN (if you have one), but the IRS encourages you to use your SSN.
List first and circle the name of the trust, estate, or pension trust. (Do not furnish the TIN of the personal representative or trustee unless the legal entity itself is not designated in the account title.)
Note: The grantor must also provide a Form W-9 to the trustee of the trust.

** For more information on optional filing methods for grantor trusts, see the Instructions for Form 1041.

Note: If no name is circled when more than one name is listed, the number will be considered to be that of the first name listed.

Secure Your Tax Records From Identity Theft

Identity theft occurs when someone uses your personal information, such as your name, SSN, or other identifying information, without your permission to commit fraud or other crimes. An identity thief may use your SSN to get a job or may file a tax return using your SSN to receive a refund.

To reduce your risk:

Protect your SSN,
Ensure your employer is protecting your SSN, and
Be careful when choosing a tax return preparer.

If your tax records are affected by identity theft and you receive a notice from the IRS, respond right away to the name and phone number printed on the IRS notice or letter.

If your tax records are not currently affected by identity theft but you think you are at risk due to a lost or stolen purse or wallet, questionable credit card activity, or a questionable credit report, contact the IRS Identity Theft Hotline at 800-908-4490 or submit Form 14039.

For more information, see Pub. 5027, Identity Theft Information for Taxpayers.

Form W-9 (Rev. 3-2024)
Page 6

Victims of identity theft who are experiencing economic harm or a systemic problem, or are seeking help in resolving tax problems that have not been resolved through normal channels, may be eligible for Taxpayer Advocate Service (TAS) assistance. You can reach TAS by calling the TAS toll-free case intake line at 877-777-4778 or TTY/TDD 800-829-4059.

Protect yourself from suspicious emails or phishing schemes. Phishing is the creation and use of email and websites designed to mimic legitimate business emails and websites. The most common act is sending an email to a user falsely claiming to be an established legitimate enterprise in an attempt to scam the user into surrendering private information that will be used for identity theft.

The IRS does not initiate contacts with taxpayers via emails. Also, the IRS does not request personal detailed information through email or ask taxpayers for the PIN numbers, passwords, or similar secret access information for their credit card, bank, or other financial accounts.

If you receive an unsolicited email claiming to be from the IRS, forward this message to [email protected]. You may also report misuse of the IRS name, logo, or other IRS property to the Treasury Inspector General for Tax Administration (TIGTA) at 800-366-4484. You can forward suspicious emails to the Federal Trade Commission at [email protected] or report them at www.ftc.gov/complaint. You can contact the FTC at www.ftc.gov/idtheft or 877-IDTHEFT (877-438-4338). If you have been the victim of identity theft, see www IdentityTheft.gov and Pub. 5027.

Go to www.irs.gov/IdentityTheft to learn more about identity theft and how to reduce your risk.

Privacy Act Notice

Section 6109 of the Internal Revenue Code requires you to provide your correct TIN to persons (including federal agencies) who are required to file information returns with the IRS to report interest, dividends, or certain other income paid to you; mortgage interest you paid; the acquisition or abandonment of secured property; the cancellation of debt; or contributions you made to an IRA, Archer MSA, or HSA. The person collecting this form uses the information on the form to file information returns with the IRS, reporting the above information. Routine uses of this information include giving it to the Department of Justice for civil and criminal litigation and to cities, states, the District of Columbia, and U.S. commonwealths and territories for use in administering their laws. The information may also be disclosed to other countries under a treaty, to federal and state agencies to enforce civil and criminal laws, or to federal law enforcement and intelligence agencies to combat terrorism. You must provide your TIN whether or not you are required to file a tax return. Under section 3406, payors must generally withhold a percentage of taxable interest, dividends, and certain other payments to a payee who does not give a TIN to the payor. Certain penalties may also apply for providing false or fraudulent information.

TMX | TSX Trust

OFFICE OF THE DEPOSITARY:

TSX TRUST COMPANY
By Registered Mail, Mail, Hand or Courier

Toronto:
100 Adelaide Street West, Suite 301
Toronto, Ontario
M5H 4H1
Attention: Corporate Actions

Securities Counter hours:
8:30 am to 5:00 pm EST - business days only

Inquiries:
8:30 am to 5:00 pm EST - business days only
North American Toll Free: 1-866-600-5869
Telephone: 1-416-342-1091
E-Mail: [email protected]

AI assistant

Alta Copper Corp. Proxy Solicitation & Information Statement 2025

44896_rns_2025-12-23_4ab534a9-2a81-464c-b205-7c4bc42a635b.pdf

LETTER OF TRANSMITTAL

FOR REGISTERED HOLDERS OF COMMON SHARES OF

ALTA COPPER CORP.

Information about this Letter of Transmittal

BOX E

WIRE PAYMENT*

SHAREHOLDER SIGNATURE(S)

INSTRUCTIONS

1. Use and Delivery of Letter of Transmittal

2. Signatures

3. Guarantee of Signatures

4. Fiduciaries, Representatives and Authorizations

9. Payment Entitlement Pick-up Locations

IRS FORM W-9

Part I Taxpayer Identification Number (TIN)

Part II Certification

General Instructions

What's New

Purpose of Form

Backup Withholding

What Is FATCA Reporting?

Updating Your Information

Penalties

Specific Instructions

Line 1

Line 2

Line 3a

Line 3b

Line 4 Exemptions

Exempt payee code.

Line 5

Line 6

Part I. Taxpayer Identification Number (TIN)

Part II. Certification

What Name and Number To Give the Requester

Secure Your Tax Records From Identity Theft

Privacy Act Notice

AI assistant

Alta Copper Corp. — Proxy Solicitation & Information Statement 2025

44896_rns_2025-12-23_4ab534a9-2a81-464c-b205-7c4bc42a635b.pdf

LETTER OF TRANSMITTAL

FOR REGISTERED HOLDERS OF COMMON SHARES OF

ALTA COPPER CORP.

Information about this Letter of Transmittal

BOX E

WIRE PAYMENT*

SHAREHOLDER SIGNATURE(S)

INSTRUCTIONS

1. Use and Delivery of Letter of Transmittal

2. Signatures

3. Guarantee of Signatures

4. Fiduciaries, Representatives and Authorizations

9. Payment Entitlement Pick-up Locations

IRS FORM W-9

Part I Taxpayer Identification Number (TIN)

Part II Certification

General Instructions

What's New

Purpose of Form

Backup Withholding

What Is FATCA Reporting?

Updating Your Information

Penalties

Specific Instructions

Line 1

Line 2

Line 3a

Line 3b

Line 4 Exemptions

Exempt payee code.

Line 5

Line 6

Part I. Taxpayer Identification Number (TIN)

Part II. Certification

What Name and Number To Give the Requester

Secure Your Tax Records From Identity Theft

Privacy Act Notice

More from Alta Copper Corp.

Alta Copper Corp. Proxy Solicitation & Information Statement 2025