Alaska Peninsula and Aleutian Islands

Tertiary felsic to intermediate composition intrusions of the Alaska Peninsula and Aleutian Islands
Tract ID 003pCu5006
Country United States of America
Commodity Cu
Study area name United States revised - Alaska
Tectonic setting mixed
Deposit type porphyry copper
Grade-tonnage model General porphyry copper model (Singer and others, 2008)
Geologic age
Geologic feature age Tertiary
Generalized age Tertiary
Oldest rocks age 60Ma
Youngest rocks age 0Ma
Age range 60Ma
Identified Cu resources 590,000metric tons
Known prospects 9
Mean Cu (t/sq km) 242t/sq km
Map scales used 250K

Results of the assessment

Assessment date 2012
Estimators Steve Ludington, Jane Hammarstrom, Gilpin Robinson, and 1996 Team
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
1 90%
3 50%
6 10%
6 5%
6 1%
Mean estimated deposits 3.23 ±1.88 (0.58%)
Probability of mean 0.38
Probability of no copper 0.07

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
1 4.23 49,650 9

Mean estimated tonnage

Copper 12,000,000
Molybdenum 340,000
Gold 310
Silver 4,100
Ore 2,600

Undiscovered copper resource

Confidence level 90% 50% 10% 5%
Tonnage 270,000 5,900,000 28,000,000 46,000,000

Economic analysis

Fraser country US-Alaska
Fraser type 0.23%
Fraser high 0.76%
Typical cost 0%
High cost 1%
Infrastructure setting High cost
Comments on depth default
Expected depth distribution
0 - 250m 0.25
250m - 500m 0.25
500m - 1km 0.5
Economically recoverable resources
Copper 5,900,000t
Molybdenum 130,000t
Gold 110t
Silver 1,900t
Probability no econ recoverable 0.66
Econ NPV 1,100x $1M
Exp dollars 11.16x $1M/100,000 sq km
Exp value class Low

Bibliographic references

General U.S. Geological Survey National Mineral Resource Assessment Team (2002)
Economic Robinson and Menzie (2012)

Deposits and prospects associated with this tract

Name Type State Country Development Details
unnamed prospect Alaska United States Prospect Details
unnamed prospect Alaska United States Prospect Details
Warner Bay prospect Alaska United States Prospect Details
Bee Creek prospect Alaska United States Prospect Details
Bee Creek prospect Alaska United States Prospect Details
Four Bear prospect Alaska United States Prospect Details
Mike prospect Alaska United States Prospect Details
Pyramid deposit Alaska United States Prospect Details
Rex prospect Alaska United States Prospect Details
Ivanof prospect Alaska United States Prospect Details