PTR MINERALS LTD — Capital/Financing Update 2010

Mar 17, 2010

Petratherm Limited Level 1, 129 Greenhill Road, Unley, South Australia 5061 e: admin@petratherm.com.au ASX: PTR A.BN. 17 106 806 884

18 March 2010

Dear Shareholder

INVITATION TO PARTICIPATE IN PETRATHERM LIMITED SHARE PURCHASE PLAN

The Directors of Petratherm Limited (Company) are pleased to offer shareholders the opportunity to participate in its Share Purchase Plan. The plan entitles eligible shareholders of the Company to purchase up to A$15,000 worth of fully paid ordinary shares in the capital of the Company, free from all brokerage and commissions. The amount an eligible shareholder can subscribe for will be restricted to a cumulative total of A$15,000 (including the worth of any shares subscribed for in Petratherm's April 2009 Share Purchase Plan). Please refer to the terms and conditions for further details.

Shareholders can purchase up to 62,500 shares at a price of 24 cents per share (A$15,000), subject to the provisions of the 'Share Purchase Plan Terms and Conditions'.

Shareholders may apply for a choice of six variable numbers of shares, with a minimum of A$1,000 (4,166 shares), the next option of A$3,000 (12,500 shares) followed by A$5,000 (20,833 shares), A$7,500 (31,250 shares), A$10,000 (41,666 shares) with a maximum subscription of A$15,000 (62,500 shares).

The Share Purchase Plan will open on 18 March 2010 and close at 5.00 pm (Adelaide time) on Friday, 9 April 2010. The Directors reserve the right to vary this date. Shareholders with a registered address in Australia or New Zealand as at 7.00 pm (Adelaide time) on the 9 March 2010 are eligible to participate in the offer.

Accompanying this letter are three documents:

• 1. a brochure detailing projects that the Company, in coming months, will be exploring and developing in its own right,in particular the Company's flagship Paralana project in South Australia and, in conjunction with the Italian company Enel Green Power SpA, the Company's Spanish projects, notably the Canary Islands;
• 1. 'Share Purchase Plan Terms and Conditions' which explains how the new shares will be issued should you participate in this offer; and
• 1. a personalised Application Form which you need to complete in accordance with the instructions provided and return to the Company's Share Registry office, Computershare Investor Services Pty Limited, with payment, in the reply paid envelope, so that it is received no later than 5.00 pm (Adelaide time) on 9 April 2010. If payment is made by BPAY, you do not need to return the Application Form but your payment must be received by 5.00 pm (Adelaide time), on 9 April 2010.

The use of the funds raised is explained in clause 14 of the accompanying 'Share Purchase Plan Terms and Conditions'.

I refer you to our recently updated website at www.petratherm.com.au to access all publicly announced information on the Company, including the promotional DVD explaining the Company and in particular the HEWI model. Hard copies of this DVD are available to be picked up from the Company's office at Level 1, 129 Greenhill Road, Unley, South Australia if required.

I hope that you will give favourable consideration to this offer as a convenient means of increasing your holding in the Company as we move towards the proof concept at our Paralana project and progress our prospective international projects.

Yours faithfully

Derek Carter Chairman

Encls.

Please return completed form to:

Computershare Investor Services Pty Limited GPO Box 2987 Adelaide South Australia 5001 Australia Enquiries (within Australia) 1300 556 161 (outside Australia) 61 3 9415 4000 web.queries@computershare.com.au www.computershare.com

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$\mathbf{A}$		Credit Card Payment Details
		Note: Only Mastercardand Visa are accepted.	Mastercard	Visa	Card Number
	Card Holder					ExpiryDate		CCVNumber
Signature									110727 - V2
	Paperclipcheque(s)here.	petratherm				Please see overleaf for Payment OptionsA$ PTR Shares Acquired 2009 SPP	Maximum A$ amount available for purchase in 2010 SPP
	Do notstaple.	Petratherm LtdACN 106 806 884			A$			A$
B		I/We wish to purchase:4,166sharesorA$1.000* These share amounts may be subject to scale-back in accordance with the terms of the SPP.	12,500sharesA$3,000	or	20,833sharesorA$5.000	31,250sharesA$7,500	41,666sharesor	orA$10,000	62,500sharesA$15,000
	Drawer			Cheque number	BSB number	Payment Details - Please note that funds are unable to be directly debited from your bank accountAccount number		Cheque amount
C		Make your cheque or bank draft payable to Petratherm Limited Share Purchase Plan						A$
D		Contact DetailsPlease provide your contact details in case we need to speak to you about this slipName of contact person					Contact person's daytime telephone number

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Petratherm is a leading global geothermal energy company with a favourable risk profile. The company balances new technology such as Engineered Geothermal Systems (EGS) with lower risk projects involving conventional geothermal (volcanic) and hot water district heating.

Petratherm considers itself a standout amongst its peers due to:

• The quality and diversity of its projects
• An excellent blend of management skills
• The successful drilling and casing of an injection well to 3.7 kilometres at the Paralana geothermal energy project
• The funding of its flagship project Paralana, through joint venture contributions from Beach Energy and TRUenergy
• Recognition by Government in the form of a $7 million Geothermal Drilling Program (GDP) grant and a $62.8 million Renewable Energy Demonstration grant for the Paralana project
• The recent Memorandum of Understanding with Enel, Europe's second largest listed utility that is highly experienced in geothermal energy, to jointly develop our Spanish projects and extend exploration to Portugal
• The prospect of early commercialization of the Paralana EGS, Tenerife volcanic and the Madrid district heating projects
• The early identification of strategic areas globally, such as China

Funds raised through this Share Purchase Plan will be used for the Company's Paralana Project and to develop, in conjunction with Enel, our Spanish projects, notably in the Canary Islands.

Spain

Petratherm has recently signed a Memorandum of Understanding (MoU) with Enel Green Power to jointly develop all electricity projects on mainland Spain, the Canary Islands and Portugal. Enel Green Power is part of the Enel Group which is Europe's second largest listed utility company.

Enel is highly experienced with geothermal energy and has more than 700 MW of power generation capacity operating and 250 MW under development. Enel also owns the Spanish electricity utility Endesa which is the incumbent utility in the Canary Islands and has franchise areas in Madrid and Barcelona.

The MoU with Enel covers;

• Exploration costs to be shared on a 50/50 basis
• Joint management committee to oversee exploration program
• Enel to contribute to 50% of past and ongoing exploration costs for Tenerife
• Enel to fully fund the first deep production (2kms to 3kms) well in return for its equity stake
• Expansion of project exploration into Portugal

The forward exploration program for Tenerife, following the recently completed magneto-telluric study, includes a slim line well (up to 1km) planned for the second half of calendar 2010.

Petratherm has four key project areas across mainland Spain and the Canary Islands.

• Madrid District Geothermal Heating project where the Company has a large 20km by 20km tenement area and has signed a cooperative agreement with the Spanish Federal and Madrid Regional governments
• Barcelona where the Company is assessing the potential for both district heating and electricity production development
• Tenerife and Gran Canaria islands, the two largest islands of the Canary Islands archipelago where the Company is targeting conventional high temperature volcanic-based geothermal electricity production

Paralana

Building Australia's first large scale base-load, zero emission commercial demonstration EGS power plant.

The Paralana Project is entering an exciting phase following:

• The completion of the Paralana deep injector well that was successfully drilled, cased and cemented to 3,725 metres in mid December 2009
• Temperatures of 190ºC at 4,000 metres are significantly higher than our minimum temperature of 170ºC that we have targeted for the economic development of the Paralana resource

The next stages of the HEWI proof of concept work during calendar 2010 will include fracture stimulation, the drilling of Paralana 3 deep producer well and circulation testing to confirm target flow rates.

• An independent resource assessment of a total inferred geothermal resource is calculated to be 230,000 ± 40,000 Petajoules. Just 1% of the total inferred resource could run a 260 MW power plant for over a 30 year period

• The project has the unique potential to be commercial at all stages of development with plans for initial small-scale, off grid power supply to the Beverley Mine and with later up-Electricity Market at either Olympic

• A staged joint venture partner investment commitment totals $87 million plus their equity

• Government grant funding support awarded during 2009 includes $7 million (GDP) towards proof of concept – with $2.8 million remaining for the drilling of Paralana 3 well and $62.8 million toward a 30 MW commercial demonstration project

L-R Hon Martin Ferguson, Federal Minister for Resources and Energy, Terry Kallis, Managing Director of Petratherm, and the Hon Mike Rann, Premier of SA

Heliotherm

Heliotherm Limited, a 100% owned subsidiary company of Petratherm Limited, has entered into an exclusive agreement with the University of Adelaide to develop the Heliotherm integrated technology project and has been offered a $0.8 million grant under the Premier's Science and Research Fund (PSRF).

The innovative project aims to reduce the cost of solar thermal technology by up to 40% through the integration of solar thermal, geothermal and combustion technologies.

Over the coming months, Petratherm Limited (through Heliotherm Limited) and the University of Adelaide plan to secure additional Commonwealth and State Government grant funding, including up to $5 million available under the Australian Solar Institute Program and from Renewables SA.

L-R Hon Mike Rann, Premier of SA, Derek Carter, Chairman of Petratherm, Hon Martin Ferguson, Federal Minister for Resources and Energy

The information in this report relating to geothermal exploration results and geothermal resources is based on information compiled by P.W. Reid, a full time Petratherm employee. Mr Reid has sufficient experience in the style of geothermal play under consideration to qualify as a Competent Person under the Australian Code for Reporting of Exploration Results, Geothermal Resources and Geothermal Reserves (2008 edition). Mr Reid consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

Design mldesign@internode.on.net Print smithimpress@internode.on.net

Petratherm Ltd ASX: PTR www.petratherm.com.au Level 1, 129 Greenhill Road UNLEY SA 5061

PETRATHERM LIMITED ACN 106 806 884

SHARE PURCHASE PLAN

TERMS AND CONDITIONS

TERMS AND CONDITIONS

These terms and conditions are the terms and conditions of the Petratherm Limited (Company) share purchase plan (Plan) and are binding on any shareholder who offers to acquire fully paid ordinary shares in the Company (Shares) under the Plan.

1. THE OFFER

The Offer is an invitation to offer to subscribe for Shares in the Company at $0.24 per Share for a choice of subscription amount of $1,000 (4,166 Shares), $3,000 (12,500 Shares), $5,000 (20,833 Shares), $7,500 (31,250 Shares), $10,000 (41,666 Shares) or $15,000 (62,500 Shares). You may apply for any one of these as specified in the Application Form. You are under no obligation to make an offer to acquire Shares. The Offer to each eligible shareholder is made on the same terms and conditions. The Offer is non-renounceable (meaning that you may not transfer your right to acquire a Share under the Offer to anyone else).

2. OPENING AND CLOSING DATE OF THE OFFER

The Offer opens at 9.00 am (Adelaide time) on 18 March 2010. The Offer closes at 5.00 pm (Adelaide time) on 9 April 2010. The Directors of the Company reserve the right to change the closing date of the Offer.

No late applications will be accepted.

3. ELIGIBILITY

You are eligible to apply for Shares if:

• (a) your registered address in the Company's register of members is in Australia or New Zealand; and
• (b) you were registered or taken to be registered as a holder of fully paid ordinary shares in the Company as at 7.00 pm (Adelaide time) on 9 March 2010.

The Directors of the Company have determined that it is not practical for holders of shares with registered addresses in jurisdictions other than Australia and New Zealand to participate in the Plan.

To the extent that you hold shares on behalf of another person resident outside Australia or New Zealand, it is your responsibility to ensure that any acceptance is in compliance with all applicable foreign laws.

Single holders: If you are the only registered holder of a holding of Shares, but you receive more than one offer under the Plan (for example due to multiple registered holdings), you may only apply for one maximum parcel of Shares.

Joint holders:If you are recorded with one or more other person as the joint holder of a holding of Shares, that joint holding is considered to be a single registered holding for the purpose of the Plan, and the joint holders are entitled to participate in the Plan in respect of that single holding only. If the same joint holders receive more than one offer under the Plan due to multiple identical holdings, the joint holders may only apply for one maximum parcel of Shares.

Custodians, trustees and nominees: If you are a custodian, trustee or nominee within the definition of 'custodian' in ASIC Class Order [CO 09/425] (Custodian) and hold Shares on behalf of one or more persons (each a Participating Beneficiary), you may apply for up to a maximum of $15,000 worth of Shares for each Participating Beneficiary, subject to providing a notice in writing to the Company (Custodian Certificate) certifying the following:

• that you hold Shares on behalf of Participating Beneficiaries who have instructed you to apply for Shares on their behalf under the Plan;
• the number of Participating Beneficiaries;
• the name and address of each Participating Beneficiary;
• the number of Shares that you hold on behalf of each Participating Beneficiary;
• the number or dollar amount of Shares which each Participating Beneficiary has instructed you to apply for on their behalf;
• that there are no Participating Beneficiaries in respect of which the total of the application price exceeds $15,000 worth of Shares, calculated by reference to Shares applied for by you as Custodian on their behalf under:
  • the Plan; and
  • any other Shares issued to you as Custodian in the 12 months before your application under an arrangement similar to the Plan,

in each case, as a result of an instruction given by them to you as Custodian to apply for Shares on their behalf.

For the purposes of ASIC Class Order [CO 09/425] you are a 'custodian' if you are a registered holder that:

• holds an Australian financial services licence that:
  • covers the provision of a 'custodial or depository service' (as defined in section 766E of the Corporations Act 2001 (Cth)); or
  • includes a condition requiring the holder to comply with ASIC Class Order [CO 02/294]; or
• is exempt under:
  • paragraph 7.6.01(1)(k) of the Corporations Regulations 2001 (Cth); or
  • ASIC Class Order [CO 05/1270] to the extent that it relates to ASIC Class Order [CO 03/184],

from the requirement to hold an Australian financial services licence for the provision of a custodial or depository service.

If you hold Shares as a trustee or nominee for another person, but are not a Custodian as defined above, you cannot participate for beneficiaries in the manner described above. In this case, the rules for multiple single holdings (above) apply.

If you require a Custodian Certificate or would like further information on how to apply, you should contact Computershare Investor Services Pty Limited.

4. ISSUE PRICE AND RELATIONSHIP TO MARKET PRICE

The issue price for each Share under the Offer is $0.24 which represents a discount to the closing price of the Company's Shares on Australian Securities Exchange (ASX) as at 9 March 2010 (the day before announcement of the Plan) of $0.07 or 22.58%. The issue price has been calculated in accordance with ASX Listing Rule 7.2 Exception 15.

5. RIGHTS ATTACHING TO SHARES

The rights and obligations of the Shares are contained in the constitution of the Company (which is available for inspection at the registered office of the Company during the period of the Offer). All Shares issued under the Plan will rank equally with existing Shares from the date of issue, and therefore will carry the same voting rights, dividend rights and other entitlements as existing Shares.

The Company will apply for the Shares to be quoted on ASX. If the Shares are not to be quoted on ASX, the Shares will not be issued and application funds will be refunded without interest.

6. APPLICATION FOR SHARES

If you are an eligible shareholder you may, as described above, apply to purchase:

• 4,166 Shares for $1,000;
• 12,500 Shares for $3,000;
• 20,833 Shares for $5,000;
• 31,250 Shares for $7,500;
• 41,666 Shares for $10,000; or
• 62,500 Shares for $15,000.

In accordance with ASIC Class Order [CO 09/425] eligible shareholders may only acquire a maximum of $15,000 worth of Shares under a share purchase plan in any 12 month period. Eligible shareholders were invited to apply for up to $5,000 worth of Shares under the Company's April 2009 share purchase plan (April 2009 Plan). This means that eligible shareholders must not acquire more than $15,000 worth of Shares in aggregate, after combining their participation in the April 2009 Plan (if any) with an application made under this Plan. If you are eligible to participate in this Plan and you:

• did participate in the April 2009 Plan, you may only apply for up to $15,000 less the worth of Shares which you acquired under the April 2009 Plan; or
• did not participate in the April 2009 Plan, you may apply for up to $15,000 worth of Shares in this Plan.

For example, if you acquired $5,000 worth of Shares under the April 2009 Plan, you may only apply for a maximum of $10,000 worth of Shares under this Plan.

The Company reserves the right in its absolute discretion to reject any application for Shares to the extent that it considers that the application (whether alone or in conjunction with other applications) does not comply with these terms and conditions or for any other reason. If an application is refused, the application monies received will be refunded without interest.

The Company may, in its absolute discretion, undertake a scaleback to the extent and in the manner it sees fit. Any scaleback will be announced on the allotment date. If there is a scaleback, a shareholder may not receive any or all of the Shares for which it applied.

If the Company undertakes a scaleback, the difference between the allocation amount (being the number of Shares actually allotted multiplied by the issue price) and the application amount paid to the Company by the applicant will be refunded (without interest) by cheque and mailed to the applicant's registered address after the date the Plan is despatched.

7. PARTICIPATION COSTS

You must pay the issue price per Share and any fees or charges incurred by you in completing the Application Form, for example bank fees or fees of your professional advisers. No brokerage, commission or other participation costs are payable by you in respect of the acquisition of Shares under the Plan.

8. ALLOTMENT OF SHARES

The Shares will be allotted as soon as possible after the closing date. The Company will send or cause to be sent to you a holding statement in due course.

9. PAYMENT FOR THE SHARES

All amounts in this Offer are expressed in Australian dollars.

Do not forward cash.

BPAY®: You may pay for the Shares via BPAY® by using the personalised reference number shown on your enclosed Application Form which is required to identify your holding. If you make your payment using BPAY® you do not need to return your Application Form. By paying by BPAY® you will be deemed to have completed an Application Form for the number of Shares the subject of your payment. New Zealand holders will not be able to make a payment using BPAY®.

Cheque:You may pay by cheque, bank draft or money order in which event you must return your Application Form together with a cheque, bank draft or money order in Australian dollars for the correct amount drawn on an Australian bank and made payable to 'Petratherm Limited Share Purchase Plan'.

Credit Card:Alternatively, payment can be made by credit card by following the instructions on the enclosed Application Form and returning your Application Form.

Receipts for payment will not be issued.

If you pay an incorrect amount the Company reserves the right to vary your application, return some or all of your payment, or both, as it deems appropriate in its sole discretion. The Company may round the payment down to the lower appropriate amount and return the unused funds. Any applications for less than $1,000 will be returned. The Company may otherwise determine that your application is invalid or defective. No interest will be paid on any refunds made for any reason.

10. OFFERS UNDER THE PLAN

The Company may make more than one invitation to acquire Shares under the Plan in any 12 month period. Shareholders will not be able to acquire Shares to a value exceeding $15,000 pursuant to the Plan in any 12 month period. The Company may amend the terms of the Plan to provide for different terms to apply to different invitations. The Company may suspend or terminate the Plan at any time. Any such amendment, suspension or termination will be binding on all eligible shareholders even where the Company does not notify you of that event.

11. APPLICATION OF PLAN

The Company may act or omit to act in relation to the Plan (including applying the terms of the Plan) in its absolute discretion. The Company may settle any difficulty or question of fact or interpretation in relation to the Plan in any manner it thinks fit, whether generally or in relation to any participant,

application or Share. The Company's decision will be conclusive and binding on all eligible shareholders and other persons to whom the decision relates. The Company reserves the right to waive strict compliance with the terms of the Plan. The Company's rights and powers under clause 10 and this clause 11 may be exercised by the Board of Directors of the Company or any delegate of the Board.

12. RISK

Subscription under the Plan is a speculative investment and the market price of Shares may change between the date of the Offer, the date you apply for Shares and the date of issue of Shares to you. Accordingly, the value of Shares applied for may rise or fall.

This Offer is not a prospectus and does not require the types of disclosures required under the Corporations Act 2001 (Cth). You must rely on your own knowledge of the Company, previous disclosures made by the Company to ASX and, if necessary, consult your professional advisers when deciding whether or not to accept the Offer and participate in the Plan.

13. PRIVACY

By receiving completed Application Forms, the Company collects personal information about shareholders. The Company will use this information for the purposes of processing the Application Form and updating the records of the Company. Unless required by the law, the Company will not disclose the personal information of a shareholder to a third party or use the personal information for another purpose without the consent of the shareholder. Except as stated by the law, shareholders are able to access, upon request, their personal information or if you wish to obtain a copy of the Company's privacy policy, please contact us.

14. USE OF FUNDS

Funds raised pursuant to the Plan will be applied to fund on-going exploration and development of the Company's projects, in particular the Company's flagship Paralana project in South Australia and, in conjunction with the Italian company Enel Green Power SpA, the Company's Spanish projects, notably the Canary Islands.

The attached brochure outlines the Company's project portfolio and details for specific projects.

15. ASIC CLASS ORDER [CO 09/425] COMPLIANCE

This offer of Shares under the Plan is made subject to and in accordance with the requirements of ASIC Class Order [CO 09/425]. That Class Order grants relief from the requirement to prepare a prospectus for the offer of Shares under the Plan.

16. DECLARATION AND ACKNOWLEDGEMENT

By making payment via BPAY®, forwarding a cheque, bank draft or money order and the completed Application Form or forwarding the completed Application Form where paying by credit card, you:

• (a) irrevocably and unconditionally agree to these terms and conditions and agree not to do any act or thing which would be contrary to the spirit, intention or purpose of the Plan;

• (b) agree to accept any lesser number of Shares than the number of Shares applied for;

• (c) certify that the aggregate of the application price for:

  • (i) the Shares the subject of the application; and
  • (ii) any other shares applied for by you or which you have instructed a Custodian to acquire on your behalf, under the Plan, the April 2009 Plan and any similar arrangement operated by the Company in the 12 months prior to the application,

(including through joint and beneficial holdings) does not exceed $15,000;

• (d) agree to be bound by the Company's constitution in respect of Shares issued under the Plan;
• (e) accept that you will not be able to withdraw or revoke your application once it has been sent to the Company or payment has been made by you via BPAY®;
• (f) authorise the Company (and its officers or agents) to correct any error or omission in your Application Form and to complete the Application Form by the insertion of any missing details;
• (g) acknowledge that the Company may at any time determine that your Application Form is valid, in accordance with these terms and conditions, even if the Application Form is incomplete, contains errors or is otherwise defective;
• (h) accept the risk associated with any refund that may be sent to you by cheque to your address shown on the Company's register of members;
• (i) acknowledge that you are responsible for any dishonour fees or other costs the Company may incur in presenting a cheque for payment which is dishonoured;
• (j) acknowledge that neither the Company nor Computershare Investor Services Pty Limited has provided you with investment advice or financial product advice, and that neither has any obligation to provide this advice, concerning your decision to apply for and buy Shares;
• (k) acknowledge that the Company is not liable for any exercise of its discretion referred to in these terms and conditions; and
• (l) certify that your acceptance of an offer under the Plan will not result in any person breaching the 20% limit imposed by section 606 of the Corporations Act 2001 (Cth).

17. GOVERNING LAW

The Offer is governed by the law in force in South Australia. By accepting the Offer, you submit to the non-exclusive jurisdiction of the Courts of South Australia.

18. IMPORTANT DATES

The important dates in relation to this Offer are summarised below. These dates are indicative only and subject to change at the discretion of the Directors of the Company.

Record date for eligibility to participate in the Plan	9 March 2010
Offer opening date	18 March 2010
Offer closing date (subject to Directors' discretion to vary)	9 April 2010
Allotment date	20 April 2010
Dispatch of holding statements	23 April 2010