Theresa Group

Porphyry copper prospect in Compostela Valley, Philippines

Names and other identifiers

Tract name Philippine Arc (142pCu7309)
Included sites Theresa, Kanarubi Cu prospect, Panurao
Site status prospect

Geographic location

Country Philippines
State or province Compostela Valley
Geographic location 126.0397, 7.3978
Geologic map unit 126.0397, 7.3978
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Neogene
Age reference geologic inference
Minerals bornite, chalcopyrite
Associated rocks quartz diorite, diorite, andesite
Tectonic setting island arc
Stratigraphic age Neogene

Commodity and development information

Development status Occurrence
Major commodities Cu, Au
Gold-Moly ratio -9999

Reference information

Comments Group of four prospects within 2 km of each other in the Masara District. Location is for Theresa. (1) Theresa: Cu prospect associated with quartz diorite. Chalcopyrite, bornite. (2) Kanarubi Cu prospect. (3) Maco gold mine: exploration project west of Philippine Fault; Miocene diorite and quartz diorite and late Miocene to Pliocene diorite and andesitic plugs and dikes. Quartz sulfide porphyry copper stockworks in mid-Miocene diorite. (4) Panurao: porphyry copper-gold deposit mined in 1962–1971. Landslide in 1972 led to mine closure. INCO reported mined 200,000 t of ore at 0.8% Cu and 7g/t Au. May be open at depth.
Study area name East and Southeast Asia
References Crew Gold (2010); Philippines Mines and Geosciences Bureau (written commun., 2004); Philippine Mining Development Corp. (2010)
Site reference Hammarstrom and others (2014)
Crew Gold, 2010, Maco project: Crew Gold Web page accessed September 15, 2010, at [Web page no longer available.]
Philippine Mining Development Corp., 2010, Philippine Mining Development Corp. home page: accessed February 15, 2010, at