Cordon Alkalic Complex

Late Oligocene to early Miocene K-alkaline magmatic province at south end of Cagayan rift basin.
Tract ID 142pCu7302
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 Late Cretaceous through Early Miocene
Generalized age Tertiary-Paleogene
Oldest rocks age 99.6Ma
Youngest rocks age 20Ma
Age range 79.6Ma
Identified Cu resources 1,400,000metric tons
Mean Cu (t/sq km) 1008t/sq km
Map scales used 200K, 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
1 50%
4 10%
5 5%
5 1%
Mean estimated deposits 1.68 ±1.74 (1.04%)
Probability of mean 0.34
Probability of no copper 0.04

Estimated deposit density

(sq km)
Deposit density
per 100,000 sq km
3 4.68 4,860 96

Mean estimated tonnage

Copper 4,900,000
Molybdenum 28,000
Gold 110
Silver 1,600
Ore 990

Undiscovered copper resource

Confidence level 50% 10% 5%
Tonnage 1,200,000 13,000,000 23,000,000

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 2,400,000t
Molybdenum 9,900t
Gold 36t
Silver 760t
Probability no econ recoverable 0.79
Econ NPV 480x $1M
Exp dollars 35.16x $1M/100,000 sq km
Exp value class Medium

Bibliographic references

General Hammarstrom and others (2014)
Economic Robinson and Menzie (2012)

Deposits and prospects associated with this tract

Name Type State Country Development Details
Marian deposit Nueva Vizcaya Philippines Prospect Details
San Fabian deposit Nueva Vizcaya Philippines Prospect Details
Dipidio Group deposit Quirino Philippines Prospect Details
Papaya Gold/Copper Project prospect Quirino Philippines Prospect Details
Pao Yabbe prospect Quirino Philippines Prospect Details
Magnetite Creek prospect Quirino Philippines Prospect Details