Results of drilling between the adjacent Cansibit and Binulig pits proved that the Cansibit-Binulig Orebody is a single huge orebody, extending even below 450 m from the surface. The lowering of the cut-off grade from 0.5% to 0.3% Cu increased the ore reserve from 54 million
tons averaging 0.81% (-240 M.L.) to 342 million tons averaging 0.52% (-415 M.L.), with 0-meter level being 33.81 m above mean sea level.

The Cansibit-Binulig Orebody was formed by deep seated hydrothermal fluids during and after the intrusion of quartz diorite into older volcanic rocks. Post intrusion movements partly affected the size and shape of the Orebody.