SA18 - Southern Appalachian Mountains

Triassic lacustrine carbonaceous mudstone intervals within sequences of continental sandstone and siltstones of the Newark Supergroup, Culpepper Basin
Tract ID 003rfCu3004
Country United States of America
Commodity Cu
Study area name United States National Assessment, revised
Deposit type sediment-hosted stratabound copper
Grade-tonnage model Sediment-hosted stratabound copper—Reduced facies-nonbrecciated
Geologic age
Geologic feature age Triassic

Results of the assessment

Assessment date 1998
Estimators Sandra Clark and Rob Robinson
Assessment depth 1km
Quantitative assessment Yes

Estimated number of deposits

Number of deposits Confidence level
1 90%
2 50%
3 10%
3 5%
3 1%
Mean estimated deposits 1.9 ±0.84 (43%)
Probability of mean 0.25
Probability of no copper 0.07

Estimated deposit density

Known
deposits
Total
deposits
Area
(sq km)
Deposit density
per 100,000 sq km
1.9 11,566 16

Mean estimated tonnage

Copper 6,600,000

Undiscovered copper resource

Confidence level 90% 50% 10% 5%
Tonnage 37,000 1,400,000 19,000,000 31,000,000

Economic analysis

Bibliographic references

General U.S. Geological Survey National Mineral Resource Assessment Team (2002)
U.S. Geological Survey National Mineral Resource Assessment Team, 2002, Assessment of undiscovered deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 02–198, CD-ROM. Also available at http://pubs.usgs.gov/of/2002/of02-198/.

Deposits and prospects associated with this tract

Name Type State Country Details
Keller's Church prospect Pennsylvania United States Details
Glenwood Station prospect Pennsylvania United States Details
Red Hill prospect Pennsylvania United States Details
Sterling prospect Virginia United States Details
Chantilly prospect Virginia United States Details
Brentsville prospect Virginia United States Details
Calverton prospect Virginia United States Details
Stevensburg prospect Virginia United States Details