Mindoro commenced exploration in the Surigao District in 1997 under a Memorandum of Agreement (MOA) signed on January 19, 1997 with Minimax Mineral Exploration Corporation (Minimax), a private Philippine company. A subsequent agreement covering the additional tenement acquisition was finalized with Minimax's affiliate, Apical Mining Corporation (Apical). Under the agreements, Mindoro may earn a 75 percent interest in the Agata, Tapian San Francisco (TSF), Tapian Main and Mat-I projects through phased exploration expenditures and issues of shares.

To date, Mindoro has earned a 75 percent interest in the Agata, Tapian San Francisco, Tapian Main Projects, and the various extension projects, and a 10 percent interest in the Mat-I Project. Mindoro's total project area in Surigao is over 26,000 hectares (ha). The granted tenements consist of a Mineral Production Sharing Agreement (MPSA) and an Exploration Permit (EP) on Agata, MPSA and EPs on TSF and Tapian Main, as well as MPSA and EP applications that are undergoing normal processing on the remaining ground. This is believed to be the second largest land holding in the District after the Philex land holdings.

Mindoro also has the option to acquire a further 25 percent from its Philippine partner at feasibility stage, bringing its total interest to 100 percent if all options are exercised.
The map below shows Mindoro's tenements and main prospects as well as the major gold, copper-gold and nickel laterite occurrences in the region.