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Chile Cretaceous Antucoya

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Cretaceous calc-alkalic plutons, including batholiths.
Tract ID 005pCu1017
Country Chile
Commodity Cu
Study area name Andes
Tectonic setting continental margin
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2005)
Geologic age
Geologic feature age Cretaceous
Generalized age Mesozoic
Oldest rocks age 145.5Ma
Youngest rocks age 65.5Ma
Age range 80Ma
Identified Cu resources 1,400,000metric tons
Known prospects 2
Mean Cu (t/sq km) 297t/sq km
Map scales used 1M

Results of the assessment

Assessment date 2005
Estimators Carlos Mario Celada, Vladimir I. Berger, Rodrigo Carrasco, Alejandro Diaz, Mariano Gajardo M., Carlos Portigliati, Donald A. Singer, Waldo Vivallo S., and Eduardo O. Zappettini
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
3 90%
6 50%
12 10%
12 5%
12 1%
Mean estimated deposits 6.7 ±3.4 (0.51%)
Probability of mean 0.33
Probability of no copper 0.03

Estimated deposit density

Known
deposits		 Total
deposits		 Area
(sq km)		 Deposit density
per 100,000 sq km
1 7.7 77,511 10

Mean estimated tonnage

Copper 23,000,000
Molybdenum 560,000
Gold 550
Silver 7,200
Ore 4,400,000,000

Undiscovered copper resource

Confidence level 95% 90% 50% 10% 5%
Tonnage 990,000 2,600,000 15,000,000 52,000,000 74,000,000

Economic analysis

Fraser country Chile
Fraser type 0.79%
Fraser high 0.21%
Typical cost 1%
High cost 0%
Infrastructure setting Typical
Comments on depth 25 cover but relatively deep erosion so use default
Expected depth distribution
0 - 250m 0.25
250m - 500m 0.25
500m - 1km 0.5
Economically recoverable resources
Copper 15,000,000t
Molybdenum 260,000t
Gold 280t
Silver 4,400t
Probability no econ recoverable 0.1
Econ NPV 4,600x $1M
Exp dollars 55.64x $1M/100,000 sq km
Exp value class High

Bibliographic references

General Cunningham and others (2008)
Economic Robinson and Menzie (2012)
Cunningham, C.G., Zappettini, E.O., Vivallo S., Waldo, Celada, C.M., Quispe, Jorge, Singer, D.A., Briskey, J.A, Sutphin, D.M., Gajardo M., Mariano, Diaz, Alejandro, Portigliati, Carlos, Berger, V.I., Carrasco, Rodrigo, and Schulz, K.J., 2008, Quantitativemineral resource assessment of copper, molybdenum, gold, and silver in undiscovered porphyry copper deposits in the Andes Mountains of South America: U.S. Geological Survey Open-File Report 2008–1253, 282 p., http://pubs.usgs.gov/of/2008/1253/.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
Angelina prospect Antofagasta Chile Past Producer Details
Antucoya deposit Antofagasta Chile Prospect Details
Puntillas-Galenosa prospect Antofagasta Chile Occurrence Details
Andacollo deposit Coquimbo Chile Producer Details