| Deposit ID | 10080205 |
|---|---|
| MRDS ID | W031306 |
| Record type | Site |
| Current site name | Cofer Prospect |
| Geographic coordinates: | -77.87499, 38.05005 (WGS84) |
|---|---|
| Elevation | 122 |
| Relative position | 5.2 KM (3.2 MI) NE OF MINERAL. |
Political divisions (FIPS codes)
Louisa(county)
Virginia(state)
United States(country)
North America(continent)
Land(continent)
USGS map quadrangles
Lake Anna West(quadrangle 1:24,000 scale)
Fredericksburg(quadrangle 1:100,000 scale)
Washington(quadrangle 1:250,000 scale)
Hydrologic units (watersheds)
Pamunkey(hydrologic unit)
Lower Chesapeake(hydrologic accounting unit)
Lower Chesapeake(hydrologic subregion)
Mid Atlantic(hydrologic region)
| Country | State | County |
|---|---|---|
| United States | Virginia | Louisa |
| Commodity | Importance |
|---|---|
| Zinc Critical | Primary |
| Lead | Primary |
| Copper | Primary |
| Gold | Secondary |
| Silver | Secondary |
| Sulfur-Pyrite | Secondary |
| Arsenic Critical | Secondary |
| Materials | Type of material |
|---|---|
| Bismuth | Ore |
| Bornite | Ore |
| Boulangerite | Ore |
| Chalcocite | Ore |
| Chalcopyrite | Ore |
| Covellite | Ore |
| Digenite | Ore |
| Electrum | Ore |
| Galena | Ore |
| Hematite | Ore |
| Ilmenite | Ore |
| Magnetite | Ore |
| Marcasite | Ore |
| Molybdenite | Ore |
| Pyrite | Ore |
| Pyrrhotite | Ore |
| Rutile | Ore |
| Sphalerite | Ore |
| Biotite | Gangue |
| Feldspar | Gangue |
| Gahnite | Gangue |
| Muscovite | Gangue |
| Quartz | Gangue |
| Result | PYRITE: 30-90%, SPHALERITE: 5-69%, CHALCOPYRITE: LESS THAN 5%, GALENA: LESS THAN 5%, AND ARSENOPYRITE: LESS THAN 3%. |
|---|
| Model code | 184 |
|---|---|
| USGS model code | 28a |
| Deposit model name | Massive sulfide, kuroko |
| Mark3 model number | 93 |
| Host or associated | Associated | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Rock type | Metamorphic Rock > Metavolcanic Rock | ||||||||
| |||||||||
| Host or associated | Associated |
|---|---|
| Rock type | Metamorphic Rock > Metavolcanic Rock > Felsic Metamorphic Rock |
| Rock unit name | Chopawamsic Formation |
| Rock description | Chopawamsic Formation |
| Host or associated | Associated |
|---|---|
| Rock type | Metamorphic Rock > Amphibolite |
| Host or associated | Host |
|---|---|
| Rock type | Metamorphic Rock > Gneiss |
| Rock unit name | Chopawamsic Formation |
| Rock description | Chopawamsic Formation |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Siltstone |
| (1) | -77.87499, 38.05005 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | Ne-Sw Trend |
| General form | POD/LENS (SUBPARALLEL LENSES) |
|---|---|
| Thickness | 10M |
| Development status | Occurrence |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1955 |
| Discoverer | New Jersey Zinc Co. |
| District name | Gold-Pyrite Belt |
|---|
| Ownership category | Private |
|---|
| Type | Owner-Operator |
|---|---|
| Owner | Piedmont Mineral Associates (Callahan Mining Corp.) |
| Type of workings | Underground |
|---|---|
| Length | 500M |
| Overall depth | 110M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | W031306 |
SRC.REF: MILLER (1978)
GAIR, J.E., (ED.), 1978, MASSIVE SULFIDES OF VIRGINIA FIELD TRIP GUIDEBOOK: INTERNATIONAL GEOLOGICAL CORRELATION PROGRAMME, PROJECT NO. 60, 112 P.
HODDER, R.W., KAZDA, R.F., AND BOJTOS, P., 1977, AN EXAMPLE OF BASE METAL MASSIVE SULFIDE DEPOSITS FROM WITHIN A TURBIDITE SUCCESSION OF THE VIRGINIA PIEDMONT (ABS.): MINING ENGINEERING, V. 29, NO. 1, P. 83.
MILLER, J.W., CRAIG, J.R. AND KAZDA, R.F., 1978, VOLCANOGENIC SULFIDES OF THE MINERAL DISTRICT, LOUISA CO., VIRGINIA (ABS.): GEOLOGICAL SOCIETY OF AMERICA: ABSTRACTS WITH PROGRAMS, V. 10, NO. 7, P. 457
MILLER, J.W., CRAIG, J.R. AND KAZDA, R.F., 1979, METAMORPHOSED VOLCANOGENIC ORES OF THE COFER DEPOSIT, MINERAL DISTRICT, LOUISA CO., VIRGINIA (ABS.): GEOLOGICAL SOCIETY OF AMERICA: ABSTRACTS WITH PROGRAMS, V. 11, NO. 4, P. 205-206.
MILLER, J.W., JR., 1978, THE ORE MINERALOGY OF THE COFER PROPERTY, LOUISA COUNTY, VIRGINIA: A VOLCANOGENIC MASSIVE SULFIDE DEPOSIT: VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY, UNPUBLISHED MS THESIS.
1950 DIREXPL NEW JERSEY ZINC CO.: LOCATED DEPOSIT
1975 DIREXPL PIEDMONT MINERAL ASSOCIATES: CONDUCTED EXPLORATORY DRILLING AND MINING TO EVALUATE.
| Subject category | Comment text |
|---|---|
| Deposit | Discovery Year: 1950'S |
| Deposit | MAX. THICKNESS ABOVE IS FOR ONE LENS. THERE ARE 4 LENSES. |
| Deposit | PIEDMONT MINERAL ASSOCIATES INCLUDES NEW JERSEY ZINC CO. AND CALLAHAN MINING CORP. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-AUG-1979 | Meintzer, Robert E. (Le Van, D.C.) | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.