- Mineral Resources
- Online Spatial Data
- Global assessment of undiscovred copper resources
U.S. part of a continental margin arc that formed during subduction of the Pacific and Juan de Fuca plates beneath western North America
Tract ID |
003pCu9014 |
Country |
United States of America |
Commodity |
Cu |
Study area name |
United States revised |
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 |
9,200,000metric tons
|
Mean Cu (t/sq km) |
147t/sq km
|
Map scales used |
500K |
Results of the assessment
Assessment date |
2010 |
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% |
8 |
50% |
14 |
10% |
14 |
5% |
14 |
1% |
|
Mean estimated deposits |
7.63 |
±4.45 |
(0.58%) |
Probability of mean |
0.33 |
Probability of no copper |
0.06 |
Estimated deposit density
Known deposits |
Total deposits |
Area (sq km) |
Deposit density per 100,000 sq km |
6 |
13.63 |
203,703 |
7 |
Mean estimated tonnage
Copper |
30,000,000 |
Molybdenum |
840,000 |
Gold |
750 |
Silver |
9,600 |
Ore |
6,000 |
Undiscovered copper resource
Confidence level |
90% |
50% |
10% |
5% |
Tonnage |
760,000 |
19,000,000 |
73,000,000 |
100,000,000 |
Economic analysis
Fraser country |
Washington*-Oregon |
Fraser type |
0.69%
|
Fraser high |
0.31%
|
Typical cost |
1%
|
High cost |
0%
|
Infrastructure setting |
Typical |
Comments on depth |
default |
Expected depth distribution |
0 - 250m |
0.25 |
250m - 500m |
0.25 |
500m - 1km |
0.5 |
Economically recoverable resources |
Copper |
20,000,000t
|
Molybdenum |
410,000t
|
Gold |
390t
|
Silver |
5,900t
|
Probability no econ recoverable |
0.11 |
Econ NPV |
5,500x $1M
|
Exp dollars |
24.49x $1M/100,000 sq km
|
Exp value class |
Medium |
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 |
Glacier Peak |
deposit |
Washington |
United States |
Occurrence |
Details |
Gold Mountain |
deposit |
Washington |
United States |
Occurrence |
Details |
Margaret |
deposit |
Washington |
United States |
Occurrence |
Details |
Mazama |
deposit |
Washington |
United States |
Prospect |
Details |
Middle Fork |
deposit |
Washington |
United States |
Occurrence |
Details |
North Fork Snoqualmie River |
deposit |
Washington |
United States |
Occurrence |
Details |
Sunrise |
deposit |
Washington |
United States |
Occurrence |
Details |