Peru Eocene–Oligocene Antapaccay

Eocene to Oligocene mostly calc-alkaline plutons, including epizonal plutons intruding abundant volcanic-arc lava flows and breccias; equivalent to rocks in tracts SA10a,bPC and SA12PC.
Tract ID 005pCu1009
Country Peru
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 Eocene and Oligocene
Generalized age Tertiary-Paleogene
Oldest rocks age 55.8Ma
Youngest rocks age 23.03Ma
Age range 32.77Ma
Identified Cu resources 14,000,000metric tons
Known prospects 3
Mean Cu (t/sq km) 630t/sq km
Map scales used 1M

Results of the assessment

Assessment date 2005
Estimators Carlos Mario Celada, Vladimir I. Berger, Rodrigo Carrasco, Charles G. Cunningham, Alejandro Diaz, Mariano Gajardo M., Carlos Portigliati, Alvaro Puig Godoy, 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%
5 50%
9 10%
9 5%
9 1%
Mean estimated deposits 5.4 ±2.36 (0.44%)
Probability of mean 0.32
Probability of no copper 0.03

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
6 11.4 30,150 38

Mean estimated tonnage

Copper 19,000,000
Molybdenum 470,000
Gold 440
Silver 6,200
Ore 3,700,000,000

Undiscovered copper resource

Confidence level 95% 90% 50% 10% 5%
Tonnage 760,000 2,100,000 11,000,000 44,000,000 62,000,000

Economic analysis

Fraser country Peru
Fraser type 0.44%
Fraser high 0.56%
Typical cost 0.27%
High cost 0.73%
Infrastructure setting Mixed
Comments on depth uniform?
Expected depth distribution
0 - 250m 0.25
250m - 500m 0.25
500m - 1km 0.5
Economically recoverable resources
Copper 9,900,000t
Molybdenum 180,000t
Gold 160t
Silver 3,100t
Probability no econ recoverable 0.36
Econ NPV 2,200x $1M
Exp dollars 56.7x $1M/100,000 sq km
Exp value class High

Bibliographic references

General Cunningham and others (2008)
Economic Robinson and Menzie (2012)

Deposits and prospects associated with this tract

Name Type State Country Development Details
Antapaccay deposit Cuzco Peru Prospect Details
Las Bambas deposit Apurímac Peru Occurrence Details
Coroccohuayco deposit Cuzco Peru Prospect Details
Cotabambas project deposit Apurímac Peru Prospect Details
Lahuani prospect Apurímac Peru Occurrence Details
Los Chancas deposit Apurímac Peru Prospect Details
Quechua deposit Cuzco Peru Prospect Details
Tintaya prospect Cuzco Peru Producer Details
Constancia deposit Cuzco Peru Prospect Details