TriAusMin Limited was incorporated in New South Wales, Australia under the name Tri Origin Australia NL as a public, no liability company  on October 21, 1993.  It was initially a 100%-owned subsidiary of Tri Origin Exploration Ltd. to hold and manage Tri Origin's Australian exploration assets, which included the Lewis Ponds polymetallic prospect.

Tri Origin Australia changed its name to Tri Origin Minerals Ltd and its shares were listed for trading on January 9, 2004 on the Australian Securities Exchange under the trading symbol TRO.  On January 22, 2010, its ordinary shares were listed on the Toronto Stock Exchange under the trading symbol TOR.  In June 2010, Tri Origin Minerals Ltd. changed its name to TriAusMin Limited following a Special Meeting of Shareholders.

TriAusMin’s major mineral resource-based assets include: Woodlawn – a significant past-producing mining district host to substantial delineated reserves and resources both underground and at surface tailings deposits and; Lewis Ponds at the centre of a re-emerging and productive gold district.  The resources delineated by TriAusMin both at Woodlawn and Lewis Ponds are located nearby mining-friendly communities with established infrastructure. TriAusMin also owns advanced and early stage exploration prospects and high potential regional exploration targets located elsewhere in the Lachlan Fold Belt. 

TriAusMin's reserve and resource inventory includes 24 Mt of an Australasian Joint Ore Reserve Committee ("JORC") Measured and Indicated Mineral Resources, plus a further 4 Mt of Inferred Mineral Resource.  The in-situ metal value of TriAusMin's resource portfolio is dominated by zinc and copper with the balance attributable to gold, silver and lead.