ORBMINCO LIMITED — Capital/Financing Update 2018

Jan 17, 2018

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to be renamed WOOMERA MINING LIMITED

Letter from the Chairman

18 January 2018

Dear Valued Shareholder,

On behalf of the Board of Directors of Ausroc Metals Limited ( Ausroc or Company ), I am pleased to advise you that the Company lodged a Replacement Prospectus with the Australian Securities & Investments Commission on 8 January 2018 ( Replacement Prospectus ) for:

• (a) the offer of up to a maximum of 35,000,000 new shares in the Company to eligible investors at an issue price of $0.20 per new share to raise up to $7,000,000 (subject to a minimum subscription of 20,000,000 new shares in the Company to raise $4,000,000) ( General Offer ); and

• (b) the offer of:

• (i) 68,259,459 new shares in the Company to the shareholders of Woomera Exploration Limited (ACN 150 741 352) in consideration for the acquisition by the Company of all the shares in Woomera Exploration Limited;

• (ii) 3,125,000 new shares in the Company to the shareholders of Volt Lithium Pty Ltd (ACN 612 465 237) ( Volt Lithium ) in consideration for the acquisition by Woomera Exploration Limited of all the shares in Volt Lithium; and

• (iii) 3,125,000 new shares in the Company to the shareholders of Liquid Lithium Pty Ltd (ACN 612 730 337) ( Liquid Lithium ) in consideration for the acquisition by Woomera Exploration Limited of all the shares in Liquid Lithium.

(collectively referred to as Vendor Offers )

The General Offer and Vendor Offers are collectively referred to in this letter as “ the Offers ”.

The Offers are now open for applications by eligible investors and will close on at 5:00pm (ACDT) on 15 February 2018.

For those of you which hold un-marketable parcels of shares in the Company, the General Offer provides you an opportunity to increase your shareholding in Company.

Replacement Prospectus

The Offers are made pursuant to, and are set out in, the Replacement Prospectus, a copy of which is available on the Company’s website at www.woomex.com.au or by calling the Company Secretary, Mr Jonathon Lindh, on 0414 169 465 (within Australia) or +61 414 169 465 (outside Australia) between 9:00am and 5:00pm ACDT.

Woomera Exploration Limited acquisition

As announced by the Company on 3 November 2017, and in connection with the Offers, Ausroc has entered into a conditional share sale agreement with the shareholders of Woomera Exploration Limited (ACN 150 741 352) ( WEX ) to acquire all of the issued share capital in WEX ( Acquisition ).

WEX is an unlisted public mining exploration company which holds, or has sought application for, approximately 5,996 km2 of tenements in South Australia in the highly prospective Musgrave and Gawler Craton regions.

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In addition to the above tenements, WEX has entered into conditional agreements to acquire all of the issued share capital in Volt Lithium and Liquid Lithium which together own a tenement package situated in Western Australia which is highly prospective for hard-rock lithium and has the potential for lithium-rich brines.

Please read the Replacement Prospectus for more information regarding the Acquisition and the respective tenements.

The Board considers that the acquisition of WEX provides Ausroc’s shareholders and incoming shareholders with an exciting opportunity to participate in a mining exploration company that has the potential to deliver shareholder returns.

Applications

You may apply for new shares in the Company under the General Offer by either:

• (a) completing and returning the General Offer Application Form accompanying the Replacement Prospectus together with payment of the applicable subscription amount in Australian dollars in accordance with the instructions set out in the General Offer Application Form; or

• (b) applying online at https://www.woomeraoffer.com.au/offer/ and following the prompts.

You should read and consider the Replacement Prospectus in full before deciding whether to participate in the Offers as it contains important information relating to the Company, WEX, Volt Lithium, Liquid Lithium and the risks associated with investing under the Offers.

Indicative Timetable

Set out below is an indicative timetable in respect of the Offers.

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Please note that the above dates may be subject to change.

Further Information

For further information in relation to the Offers, please contact either:

• (a) the Company Secretary, Mr Jonathon Lindh on 0414 169 465 (within Australia) or +61 414 169 465 (outside Australia): or

• (b) contacting the Lead Manager by telephone on 03 8548 3333 (within Australia) or +61 3 8548 3333 (outside Australia),

between 9:00am to 5:00pm (ACDT).

On behalf of the Board, I invite you to subscribe for new shares in the Company under the Offers and look forward to your continued support as an Existing Shareholder.

Yours Sincerely,

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Neville Martin Chairman

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