Macarthur Minerals Limited, together with its subsidiaries, engages in the exploration and evaluation of mineral resource properties in Australia and the United States. It primarily explores for gold, lithium, iron ore, and nickel deposits. The company was formerly known as Macarthur Diamonds Limited and changed its name to Macarthur Minerals Limited in July 2005. Macarthur Minerals Limited was incorporated in 2002 and is headquartered in Milton, Australia.