Darra Alasang

A Carboniferous through Triassic continental margin arc in northern Afghanistan
Tract ID 142pCu8901
Country Afghanistan
Commodity Cu
Study area name Afghanistan
Tectonic setting continental margin
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Carboniferous through Triassic
Generalized age Paleozoic
Oldest rocks age 359.2Ma
Youngest rocks age 199.6Ma
Age range 159.6Ma
Known prospects 1
Mean Cu (t/sq km) 114t/sq km
Map scales used 850K

Results of the assessment

Assessment date 2006
Estimators Steve Ludington, Jeff L. Doebrich, Robert G. Eppinger, Douglas B. Stoeser, Carol A. Finn, Lawrence W. Snee, John C. Mars
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
1 50%
2 10%
2 5%
2 1%
Mean estimated deposits 1 ±0.79 (0.79%)
Probability of mean 0.15
Probability of no copper 0.31

Estimated deposit density

(sq km)
Deposit density
per 100,000 sq km
1 35,090 3

Mean estimated tonnage

Copper 4,000,000
Molybdenum 100,000
Gold 92
Silver 1,200
Ore 800

Undiscovered copper resource

Confidence level 50% 10% 5%
Tonnage 700,000 8,500,000 17,000,000

Economic analysis

Fraser country Afghanistan
Fraser type 0%
Fraser high 0%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth shallow
Expected depth distribution
0 - 250m 0.35
250m - 500m 0.25
500m - 1km 0.4
Economically recoverable resources
Copper 2,100,000t
Molybdenum 40,000t
Gold 35t
Silver 600t
Probability no econ recoverable 0.89
Econ NPV 370x $1M
Exp dollars 1.7x $1M/100,000 sq km
Exp value class Very Low

Bibliographic references

General Ludington and others (2007)
Economic Robinson and Menzie (2012)