- Mineral Resources
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- Global assessment of undiscovred copper resources
Southeast Alaska Tertiary
Tertiary subduction and postsubduction calc-alkalic plutons of southeast Alaska
| Tract ID |
003pCu5005 |
| Country |
United States of America |
| Commodity |
Cu |
| Study area name |
United States revised - Alaska |
| Tectonic setting |
continental margin |
| 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 |
510,000metric tons
|
| Mean Cu (t/sq km) |
560t/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 |
|
|
| 3 |
10% |
| 9 |
5% |
| 16 |
1% |
|
| Mean estimated deposits |
1.56 |
±3.3 |
(2.11%) |
| Probability of mean |
0.18 |
| Probability of no copper |
0.57 |
Estimated deposit density
Known
deposits |
Total
deposits |
Area
(sq km) |
Deposit density
per 100,000 sq km |
| 2 |
3.56 |
10,900 |
33 |
Mean estimated tonnage
| Copper |
6,100,000 |
| Molybdenum |
160,000 |
| Gold |
150 |
| Silver |
2,000 |
| Ore |
1,200 |
Undiscovered copper resource
| Confidence level |
10% |
5% |
| Tonnage |
16,000,000 |
34,000,000 |
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 |
skew shallow |
| Expected depth distribution |
|---|
| 0 - 250m |
0.35 |
| 250m - 500m |
0.25 |
| 500m - 1km |
0.4 |
| Economically recoverable resources |
|---|
| Copper |
3,200,000t
|
| Molybdenum |
65,000t
|
| Gold |
56t
|
| Silver |
1,000t
|
| Probability no econ recoverable |
0.9 |
| Econ NPV |
570x $1M
|
| Exp dollars |
-5.78x $1M/100,000 sq km
|
| Exp value class |
Very 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 |
| unnamed |
prospect |
Alaska |
United States |
Prospect |
Details |
| Margerie Glacier |
deposit |
Alaska |
United States |
Occurrence |
Details |
| Nunatak |
deposit |
Alaska |
United States |
Occurrence |
Details |
| unnamed |
prospect |
Alaska |
United States |
Prospect |
Details |
