- Mineral Resources
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- Global assessment of undiscovred copper resources
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) |
U.S. Geological Survey National Mineral Resource Assessment Team, 2002, Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United StatesA portable document (pfd) recompilation of USGS Open-file Report 96-96 and Circular 1178, recompiled by Paul Schruben: U.S. Geological Survey Open-File Report 02-198, http://pubs.usgs.gov/of/2002/of02-198/.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 20105090H, 21 p., http://pubs.usgs.gov/sir/2010/5090/h/.
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 |