Cocos

Middle to Late Tertiary continental arc formed above the northern part of the Middle America Trench in a complex zone of interaction of the North American, Caribbean, and Cocos Plates
Tract ID 003pCu4004
Country Costa Rica-El Salvador-Guatemala-Honduras-Mexico-Nicaragua-Panama
Commodity Cu
Study area name Central America and Caribbean Basin
Tectonic setting mixed
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Miocene through Pliocene
Generalized age Tertiary-Neogene
Oldest rocks age 34Ma
Youngest rocks age 1.806Ma
Age range 32.194Ma
Identified Cu resources 15,000,000metric tons
Known prospects 4
Mean Cu (t/sq km) 260t/sq km
Map scales used 500K

Results of the assessment

Assessment date 2010
Estimators Floyd Gray, Steve Ludington, Carl Nelson, and Lukas Zurcher
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
4 90%
14 50%
24 10%
24 5%
24 1%
Mean estimated deposits 13.73 ±6.97 (0.51%)
Probability of mean 0.36
Probability of no copper 0.02

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
2 15.73 203,630 8

Mean estimated tonnage

Copper 53,000,000
Molybdenum 1,400,000
Gold 1,300
Silver 18,000
Ore 11,000

Undiscovered copper resource

Confidence level 95% 90% 50% 10% 5%
Tonnage 2,200,000 6,100,000 39,000,000 120,000,000 160,000,000

Economic analysis

Fraser country Honduras*
Fraser type 0.5%
Fraser high 0.5%
Typical cost 0.45%
High cost 0.55%
Infrastructure setting Mixed
Comments on depth skew deep
Expected depth distribution
0 - 250m 0.1
250m - 500m 0.3
500m - 1km 0.6
Economically recoverable resources
Copper 29,000,000t
Molybdenum 580,000t
Gold 500t
Silver 9,200t
Probability no econ recoverable 0.1
Econ NPV 6,200x $1M
Exp dollars 28.4x $1M/100,000 sq km
Exp value class Medium

Bibliographic references

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

Deposits and prospects associated with this tract

Name Type State Country Development Details
Cerro Chorcha deposit Chiriquí Panama Prospect Details
Cerro Colorado deposit Chiriquí Panama Prospect Details
Ixhuatán prospect Chiapas Mexico Prospect Details
Los Lirios prospect Choluteca Honduras Prospect Details
Nari prospect Limón Costa Rica Prospect Details
Sukut prospect Limón Costa Rica Prospect Details
Tolimán prospect Chiapas Mexico Occurrence Details