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Philippine Arc

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Oligocene to Pleistocene Philippine Arc
Tract ID 142pCu7309
Country Philippines
Commodity Cu
Study area name East and Southeast Asia
Tectonic setting island arc
Deposit type porphyry copper
Grade-tonnage model Porphyry copper, Cu-Au subtype (Singer and others, 2008)
Geologic age
Geologic feature age Eocene through Holocene
Generalized age Tertiary-Paleogene
Oldest rocks age 55.8Ma
Youngest rocks age 0Ma
Age range 55.8Ma
Identified Cu resources 5,700,000metric tons
Known prospects 32
Mean Cu (t/sq km) 1162t/sq km
Map scales used 1M

Results of the assessment

Assessment date 2010
Estimators Jane M. Hammarstrom, Gilpin R. Robinson, Jr., Steve Ludington, Arthur A. Bookstrom, and Michael L. Zientek
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
3 90%
7 50%
14 10%
14 5%
14 1%
Mean estimated deposits 7.7 ±4.07 (0.53%)
Probability of mean 0.34
Probability of no copper 0.03

Estimated deposit density

Known
deposits		 Total
deposits		 Area
(sq km)		 Deposit density
per 100,000 sq km
5 12.7 20,650 61

Mean estimated tonnage

Copper 24,000,000
Molybdenum 140,000
Gold 1,300
Silver 8,000
Ore 4,900

Undiscovered copper resource

Confidence level 95% 90% 50% 10% 5%
Tonnage 960,000 2,400,000 15,000,000 58,000,000 80,000,000

Economic analysis

Fraser country Philippines
Fraser type 0.11%
Fraser high 0.88%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth default
Expected depth distribution
0 - 250m 0.25
250m - 500m 0.25
500m - 1km 0.5
Economically recoverable resources
Copper 12,000,000t
Molybdenum 49,000t
Gold 430t
Silver 3,800t
Probability no econ recoverable 0.34
Econ NPV 2,200x $1M
Exp dollars 75.77x $1M/100,000 sq km
Exp value class High

Bibliographic references

General Hammarstrom and others (2014)
Economic Robinson and Menzie (2012)
Hammarstrom, J.M., Bookstrom, A.A., DeMarr, M.W., Dicken, C.L., Ludington, Steve, Robinson, G.R., Jr., and Zientek, M.L., with contributions from Cox, D.P., Manipon, C.J.C., Rollan, L.A., Sakimoto, Takehiro, Takagi, Tetsuichi, and Watanabe, Yasushi, 2013,Porphyry copper assessment of East and Southeast Asia—Philippines, Taiwan (Republic of China), Republic of Korea (South Korea), and Japan: U.S. Geological Survey Scientific Investigations Report 2010–5090–P, 241 p., http://pubs.usgs.gov/sir/2010/5090/p/.Robinson, G.R., Jr., and Menzie, W.D., 2012, Economic filters for evaluating porphyry copper deposit resource assessments using grade-tonnage deposit models, with examples from the U.S. Geological Survey global mineral resource assessment (ver 1.2, March 2014): U.S. Geological Survey Scientific Investigations Report 2010–5090–H, 21 p., http://pubs.usgs.gov/sir/2010/5090/h/.

Deposits and prospects associated with this tract

Name Type State Country Development Details
Lasang prospect Agusan del Sur Philippines Occurrence Details
Boyongan-Bayugo Group deposit Surigao del Norte Philippines Prospect Details
Luna-Asiga deposit Agusan del Norte Philippines Prospect Details
Amacan deposit Compostela Valley Philippines Past Producer Details
Kingking deposit Compostela Valley Philippines Prospect Details
Lingig Copper/Gold Project prospect Surigao del Sur Philippines Occurrence Details
Agata Group prospect Agusan del Norte Philippines Occurrence Details
Ayan Gold Project prospect Davao Oriental Philippines Occurrence Details
Bolobolo prospect Agusan del Norte Philippines Occurrence Details
Usa prospect Agusan del Sur Philippines Occurrence Details
Gamuton prospect Agusan del Sur Philippines Occurrence Details
Hope prospect Compostela Valley Philippines Occurrence Details
Kamarangan gold/copper prospect prospect Agusan del Sur Philippines Occurrence Details
Limao prospect Compostela Valley Philippines Occurrence Details
Mabulao Copper/Gold Project prospect Camarines Norte Philippines Occurrence Details
Madja copper/gold prospect prospect Surigao del Norte Philippines Occurrence Details
Malangza Copper/Gold Project prospect Southern Leyte Philippines Occurrence Details
Mapawa-Mabuhay Group prospect Surigao del Norte Philippines Past Producer Details
Mawab Gold Project prospect Compostela Valley Philippines Occurrence Details
Paco Gold/Copper Project prospect Surigao del Norte Philippines Occurrence Details
Philsaga - Bunawan JV Gold Project prospect Agusan del Sur Philippines Occurrence Details
Placer Gold/Copper mine prospect Surigao del Norte Philippines Occurrence Details
Samay Copper/Gold Project prospect Camarines Sur Philippines Occurrence Details
Saugon prospect Agusan del Sur Philippines Occurrence Details
Sogod Base Metal Project prospect Southern Leyte Philippines Occurrence Details
Surigao Copper/Gold Project prospect Surigao del Norte Philippines Occurrence Details
Tambis Gold Project prospect Surigao del Sur Philippines Occurrence Details
Tapian Main prospect Surigao del Norte Philippines Occurrence Details
Tapian San Francisco gold prospect prospect Surigao del Norte Philippines Occurrence Details
Theresa Group prospect Compostela Valley Philippines Occurrence Details
Upper Masara prospect Compostela Valley Philippines Occurrence Details
Wagas Mapula prospect Compostela Valley Philippines Past Producer Details
Taguibo prospect Davao Oriental Philippines Occurrence Details
Comval Group prospect Compostela Valley Philippines Occurrence Details
Manat prospect Compostela Valley Philippines Occurrence Details
Kalaya-an Copper/Gold Project prospect Surigao del Norte Philippines Occurrence Details
Matanlang deposit Camarines Norte Philippines Prospect Details
Mapula Group deposit Compostela Valley Philippines Prospect Details