- 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 |
