VANCOUVER, BRITISH COLUMBIA--(Marketwire - June 15, 2011) -

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Macarthur Minerals Limited (News - Market indicators) ("the Company" or "Macarthur") is pleased to announce that environmental baseline survey work is progressing well. The focus is solely now on Snark to deliver the Direct Shipping Ore (DSO) material to support the DSO Program.

A number of environmental specialists have been commissioned to conduct studies co-ordinated by Macarthur's Environmental Manager, Cathy Galli. A brief summary of results to date include:

Flora surveys

Autumn Level 2 flora surveys of Snark, Central, East Moonshine and Lost World/Banjo completed during May 2011. No declared rare flora found.

Fauna survey

Autumn Level 2 fauna survey of Snark completed in May. As expected mammal numbers were low. No conservation significant species were recorded in trap lines.

Two conservation significant bird species were recorded both of which are listed as Priority 4 under the state Western Australian Wildlife Conservation Act. Six disused Malleefowl mounds were recorded. Malleefowl is of national significance listed as vulnerable under the Environmental Protection and Biodiversity Conservation Act. Further surveys for this species will commence in July 2011.

Short Range Endemic surveys

Short Range Endemic (invertebrate) surveys completed in May (autumn). Further surveys are planned in June to fully understand potential impacts by mining.

Subterranean fauna survey

An extensive pilot program was successfully completed in January 2011. No stygofauna were recorded. Results from troglofauna revealed two species. Additional surveys for both stygofauna and troglofauna to fully understand potential impacts by mining are planned.

Archaeological and ethnographical surveys

Archaeological surveys across all exploration areas south of the Evanston Menzies road were completed in May 2011. Three sites were recorded. Ethnographic surveys are being carried out and due for Phase 1 completion in June 2011.

Regional Environmental Impact Assessment

The Company regards a regional approach to environmental impact assessment and baseline survey knowledge as important. Information gathered can be used to support other development programs. Assessment within the extensive tenement package is a significant contribution to future regional development of the Yilgarn Iron Ore Province in Western Australia.

Part of regional assessment strategy is the imminent arrangement to fly high resolution aerial imagery with LIDAR. This data will broaden capacity for regional environmental impact assessment, resource geology and engineering potential.

ABOUT MACARTHUR MINERALS LIMITED (News - Market indicators)

Macarthur Minerals Limited, is a Perth, Australia based resource development company that is currently focused on developing its Lake Giles Iron Ore project, located in the Yilgarn iron ore district in Western Australia. The Lake Giles project is located 110Km from rail with direct access to the Port of Esperance, Western Australia. The project has a resource of 1.3 billion tonnes of Magnetite mineralization that has been reported in accordance with National Instrument 43-101, and 18 million tonnes of potential Direct Shipping Ore (DSO) Goethite/Hematite at 55.5% Fe.

On behalf of the Board of Directors,

MACARTHUR MINERALS LIMITED

Alan Phillips, President, Chairman & CEO

Caution Regarding Forward Looking Statements

The forward-looking statements in this document reflect the current expectations, assumptions or beliefs of the Company based upon information currently available to the Company. With respect to forward-looking statements contained in this document, assumptions have been made regarding, among other things, the reliability of information prepared and/or published by third parties that is referenced in this document or was otherwise relied upon by the Company in preparing this document. Although the Company believes the expectations expressed in such forwardlooking statements are based on reasonable assumptions, such statements are not guarantees of future performance and no assurance can be given that these expectations will prove to be correct as actual results or developments may differ materially from those projected in the forward-looking statements. The term "ore" in DSO is not meant to imply economic viability has been established. Factors that could cause actual results to differ materially from those in forwardlooking statements include unforseen technology changes that results in a reduction in iron or magnetite demand or substitution by other metals or materials, the discovery of new large low cost deposits of iron ore or magnetite and the general level of global economic activity. Readers are cautioned not to place undue reliance on forward-looking statements due to the inherent uncertain- ty thereof. Such statements relate to future events and expectations and, as such, involve known and unknown risks and uncertainties. The forward-looking statements contained in this document are made as of the date of this document. Ex- cept as may otherwise be required pursuant to applicable laws, the Company does not assume any obligation to update or revise these forward-looking statements, whether as a result of new information, future events or otherwise