Ore and Alteration Types of the Gold and Copper ...
The Surigao Mining District (SMD) is located on the northeastern part of Mindanao Island, Philippines. The SMD is well-known for its copper, gold, chromite and nickel deposits and prospects (e.g. Bureau of Mines and Geosciences [BMG], 1986 ). Copper mineralization is mostly porphyry copper in style with signifi cant amounts of gold.