Masbate-Negros

Masbate- Negros island arc system ( Eocene to Miocene W, Miocene to Holocene E)
Tract ID 142pCu7305
Country Philippines
Commodity Cu
Study area name East and Southeast Asia
Tectonic setting island arc
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Miocene
Generalized age Tertiary-Neogene
Oldest rocks age 23.03Ma
Youngest rocks age 5.332Ma
Age range 17.698Ma
Identified Cu resources 6,800,000metric tons
Known prospects 7
Mean Cu (t/sq km) 638t/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
2 50%
4 10%
4 5%
4 1%
Mean estimated deposits 2 ±1.45 (0.73%)
Probability of mean 0.26
Probability of no copper 0.2

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
5 7 12,230 57

Mean estimated tonnage

Copper 7,800,000
Molybdenum 210,000
Gold 44
Silver 2,600
Ore 1,600

Undiscovered copper resource

Confidence level 50% 10% 5%
Tonnage 2,800,000 18,000,000 31,000,000

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 deep
Expected depth distribution
0 - 250m 0.1
250m - 500m 0.3
500m - 1km 0.6
Economically recoverable resources
Copper 3,500,000t
Molybdenum 76,000t
Gold 13t
Silver 1,100t
Probability no econ recoverable 0.86
Econ NPV 570x $1M
Exp dollars 6.48x $1M/100,000 sq km
Exp value class Low

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
Sipalay Group deposit Negros Occidental Philippines Past Producer Details
Hinoba-an Group deposit Negros Occidental Philippines Prospect Details
Aya Aya deposit Negros Oriental Philippines Prospect Details
Basay Group deposit Negros Oriental Philippines Prospect Details
Suguibon deposit Negros Occidental Philippines Prospect Details
Ayungon Copper/Gold Project prospect Negros Oriental Philippines Occurrence Details
Guimaras Gold/Silver/Copper Project prospect Guimaras Philippines Occurrence Details
Inayawan prospect Negros Occidental Philippines Occurrence Details
Masbate Gold/Copper Project prospect Masbate Philippines Occurrence Details
Pan de Azucar Copper/Gold Project prospect Iloilo Philippines Occurrence Details
Umas-Mambuyang prospect Negros Occidental Philippines Occurrence Details
Manlupo prospect Negros Occidental Philippines Occurrence Details