ORBMINCO LIMITED — Capital/Financing Update 2012

Sep 19, 2012

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20 September 2012

ASX Release By e-lodgement

Option agreement finalised for the purchase of Arizona Copper/Gold/Silver projects

Highlights

• AusAmerican has finalised an option agreement to purchase two copper/gold/silver projects located in Arizona in the USA

• Company has paid a $75,000 fee for a 12 month option over the two projects

The Directors of Australian-American Mining Corporation Limited (“AusAmerican” or “the company”) are pleased to announce that due diligence has been successfully completed and the option agreement to purchase the Bluebell and De Soto projects has been finalised.

The Bluebell and De Soto Mines

The Bluebell Mine was operated from 1906 to 1926 and produced approximately 1.2 million tons at 3.2% copper, 1.7g/t gold and 42g/t silver. The operation had 5 operating shafts with the main shaft sunk to approximately 420m below the surface. Around 9.1km of underground workings were developed. The mining method used was shrink stoping where high grade lenses were selectively mined. Individual high grade lenses were up to 4m wide. The cut-off grade for the mine varied from 2 to 3% copper depending on the price of copper at the time.

The De Soto mine was discovered in 1890 and operated in the early 1900’s. Production was approximately 280,000 tons at a grade of 3.7% copper, 1.4g/t gold and 34g/t silver. The mining operation utilised a number of adits and ore was extracted from several small high grade VMS bodies.

Both projects are located on patented mining claims. This type of claim confers both the ownership of the surface rights as well as the mineral rights. Permitting of exploration projects on private land is a simple and a well-defined process.

Australian American Mining Corporation Ltd ABN 99 073 155 781 Level 6/5 Mill Street, Perth, WA, Australia, 6000 PO Box 1788, West Perth, WA, Australia, 6872 Telephone: (08) 9481 0799 Facsimile: (08) 9481 1927

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Exploration Target

The projects are viewed as highly prospective for Cu/Au/Ag mineralisation with an exploration target at the Bluebell mine of 15 – 20 million tonnes @ 0.6 – 0.8% copper, 0.2 – 0.4 g/t gold and 15 – 30g/t silver. The exploration target is based upon a combination of historical mining information (geological plans, sections and limited underground drilling/sampling) and surface geological mapping of the prospective horizon.

The potential quantity and grade stated in the Exploration Target is conceptual in nature and there has been insufficient exploration to define a Mineral Resource. It is uncertain if further exploration will result in the determination of a Mineral Resource.

The De Soto project is considered equally prospective however due to the limited amount of information available, further work is required to establish an exploration target.

Sincerely,

Richard Holmes Managing Director

Competent Persons Statement

The information in this document that relates to exploration results is based on information compiled by Richard Holmes, Managing Director, AusAmerican Mining who is a Member of the Australian Institute of Mining and Metallurgy. Mr Holmes is a full-time employee of AusAmerican Mining and has sufficient experience which is relevant to the style of mineralisation and types of deposits under consideration and to the activity which has been undertaken to qualify as a Competent Person as defined by the 2004 edition of the “Australian Code for the Reporting of Exploration Results, Mineral Resources and Ore Reserves”. Mr Holmes consents to the inclusion in the report of the matters based on the information in the form and context in which it appears.

Australian American Mining Corporation Ltd ABN 99 073 155 781 Level 6/5 Mill Street, Perth, WA, Australia, 6000 PO Box 1788, West Perth, WA, Australia, 6872 Telephone: (08) 9481 0799 Facsimile: (08) 9481 1927

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About Australian American Mining Corporation

AusAmerican is a multi-commodity international exploration company. All of its projects are currently located in the United States of America (“USA”).

The company’s copper/gold projects are:

• Bluebell (option to purchase 100%) - Arizona

• De Soto (option to purchase 100%) - Arizona

• San Marcos (100%) - Arizona

• Bernard (90%) - Arizona

The company’s uranium projects are:

• Rio Puerco (100%) - New Mexico

• Grants Ridge JV (earning 65%) - New Mexico

• Kit Carson (100%) - New Mexico

• Northern project (100%) - New Mexico

• Apex/Lowboy (100%) – Nevada

• Lone Star JV (90%) – Texas

• Apache Basin (100%) – Arizona

The company’s REE/speciality metals projects:

• La Paz - Arizona.

• White Picacho – Arizona

ENDS

Further information contact; Richard Holmes Managing Director +61 8 9481 0799

rholmes@ausamerican.com

Australian American Mining Corporation Ltd ABN 99 073 155 781 Level 6/5 Mill Street, Perth, WA, Australia, 6000 PO Box 1788, West Perth, WA, Australia, 6872 Telephone: (08) 9481 0799 Facsimile: (08) 9481 1927