First Mining Gold Corp. — Proxy Solicitation & Information Statement 2021

May 20, 2021

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FIRST MINING GOLD CORP.

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Security Class

Holder Account Number

Form of Proxy - Annual General and Special Meeting to be held on Wednesday, June 30, 2021

This Form of Proxy is solicited by and on behalf of Management.

Notes to proxy

1. Every holder has the right to appoint some other person or company of their choice, who need not be a holder, to attend and act on their behalf at the meeting or any adjournment or postponement thereof. If you wish to appoint a person or company other than the Management Nominees whose names are printed herein, please insert the name of your chosen proxyholder in the space provided (see reverse).

2. If the securities are registered in the name of more than one owner (for example, joint ownership, trustees, executors, etc.), then all those registered should sign this proxy. If you are voting on behalf of a corporation or another individual you may be required to provide documentation evidencing your power to sign this proxy with signing capacity stated.

3. This proxy should be signed in the exact manner as the name(s) appear(s) on the proxy.

4. If a date is not inserted in the space provided on the reverse of this proxy, it will be deemed to bear the date on which it was mailed to the holder by Management.

5. The securities represented by this proxy will be voted as directed by the holder, however, if such a direction is not made in respect of any matter, and the proxy appoints the Management Nominees listed on the reverse, this proxy will be voted as recommended by Management.

6. The securities represented by this proxy will be voted in favour, or withheld from voting, or voted against each of the matters described herein, as applicable, in accordance with the instructions of the holder, on any ballot that may be called for. If you have specified a choice with respect to any matter to be acted on, the securities will be voted accordingly.

7. This proxy confers discretionary authority in respect of amendments or variations to matters identified in the Notice of Meeting and Management Information Circular or other matters that may properly come before the meeting or any adjournment or postponement thereof, unless prohibited by law.

8. This proxy should be read in conjunction with the accompanying documentation provided by Management.

Proxies submitted must be received by 10:00 am, Pacific Time, on Monday, June 28, 2021.

VOTE USING THE TELEPHONE OR INTERNET 24 HOURS A DAY 7 DAYS A WEEK!

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To Vote Using the Telephone
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To Vote Using the Internet
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To Receive Documents
Electronically
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To Virtually Attend the
Meeting
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• Call the number listed BELOW from a touch tone • Go to the following web site: • You can enroll to receive future securityholder •[You can attend the meeting virtually by visiting] telephone. www.investorvote.com communications electronically by visiting the URL provided on the back of this proxy 1-866-732-VOTE (8683) Toll Free • Smartphone? Scan the QR code to vote now. www.investorcentre.com.

If you vote by telephone or the Internet, DO NOT mail back this proxy.

Voting by mail may be the only method for securities held in the name of a corporation or securities being voted on behalf of another individual.

Voting by mail or by Internet are the only methods by which a holder may appoint a person as proxyholder other than the Management Nominees named on the reverse of this proxy. Instead of mailing this proxy, you may choose one of the two voting methods outlined above to vote this proxy.

To vote by telephone or the Internet, you will need to provide your CONTROL NUMBER listed below.

CONTROL NUMBER

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Appointment of Proxyholder

I/We being holder(s) of securities of First Mining Gold Corp. (the “Corporation”) hereby appoint: Keith Neumeyer, or failing this person, Daniel W. Wilton (the "Management Nominees")

OR

Print the name of the person you are appointing if this person is someone other than the Management Nominees listed herein.

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Note: If completing the appointment box above YOU MUST go to http:// www.computershare.com/FirstMiningGold and provide Computershare with the name and email address of the person you are appointing. Computershare will use this information ONLY to provide the appointee with a user name to gain entry to the online meeting.

as my/our proxyholder with full power of substitution and to attend, act and to vote for and on behalf of the holder in accordance with the following direction (or if no directions have been given, as the proxyholder sees fit) and on all other matters that may properly come before the virtual Annual General and Special Meeting of shareholders of the Corporation to be held online at https://agm.issuerdirect.com/ff, on Wednesday, June 30, 2021 at 10:00 a.m. (Pacific Time) and at any adjournment or postponement thereof.

VOTING RECOMMENDATIONS ARE INDICATED BY HIGHLIGHTED TEXT OVER THE BOXES.

					For	Against	-------
1.Number of Directors							Fold
To set the number of Directors at five (5).
2.Election of Directors	For	Withhold	For	Withhold	For	Withhold
01. Keith Neumeyer		02. Richard Lock		03. Leanne Hall
04. Raymond Polman		05. Daniel W. Wilton
					For	Withhold
3.Appointment of Auditor
Appointment of PricewaterhouseCoopers		LLP as Auditor of the Corporation for the ensuing year and authorizing the Directors to fix their
remuneration.
					For	Against

4. Plan of Arrangement

To consider and, if thought fit, pass, with or without amendment, a special resolution approving a statutory plan of arrangement under section 288 of the Business Corporations Act (British Columbia), the full text of which resolution is set forth in Appendix “C” to the Management Information Circular.

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Signature of Proxyholder

Signature(s) Date If no voting instructions are Annual Financial Statements - Mark this box if you would Information Circular - Mark this box if you would like to like to receive the Annual Financial Statements and receive the Information Circular by mail for the next accompanying Management’s Discussion and Analysis by securityholders' meeting. mail.

I/We authorize you to act in accordance with my/our instructions set out above. I/We hereby revoke any proxy previously given with respect to the Meeting. If no voting instructions are indicated above, and the proxy appoints the Management Nominees, this Proxy will be voted as recommended by Management.

Interim Financial Statements - Mark this box if you would like to receive Interim Financial Statements and accompanying Management’s Discussion and Analysis by mail.

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If you are not mailing back your proxy, you may register online to receive the above financial report(s) by mail at www.computershare.com/mailinglist.

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A Q O Q

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