| Deposit ID | 10021648 |
|---|---|
| MRDS ID | DE00333 |
| Record type | Site |
| Current site name | Viloco Mine |
| Alternate or previous names | Araca |
| Geographic coordinates: | -67.63561, -16.87268 (WGS84) |
|---|---|
| Elevation | 4775 |
| Relative position | AT VILOCO |
Political divisions (FIPS codes)
La Paz(province)
Bolivia(country)
South America(continent)
Land(continent)
| Country | State |
|---|---|
| Bolivia | La Paz |
| Bolivia | La Paz |
| Commodity | Importance |
|---|---|
| Tin Critical | Primary |
| Tungsten Critical | Secondary |
| Arsenic Critical | Tertiary |
| Zinc Critical | Tertiary |
| Copper | Tertiary |
| Molybdenum | Tertiary |
| Materials | Type of material |
|---|---|
| Cassiterite | Ore |
| Chalcopyrite | Ore |
| Molybdenite | Ore |
| Scheelite | Ore |
| Sphalerite | Ore |
| Wolframite | Ore |
| Chlorite | Gangue |
| Pyrite | Gangue |
| Pyrrhotite | Gangue |
| Quartz | Gangue |
| Tourmaline | Gangue |
| Model code | 77 |
|---|---|
| USGS model code | 20b |
| Deposit model name | Sn-polymetallic vein |
| Host or associated | Associated | ||||||
|---|---|---|---|---|---|---|---|
| Rock type | Plutonic Rock > Granitoid > Granite | ||||||
| Rock unit name | Quimsa Cruz (Tres Cruces) Batholith | ||||||
| Rock description | Quimsa Cruz (Tres Cruces) Batholith | ||||||
| |||||||
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Shale |
| Host or associated | Host |
|---|---|
| Rock type | Sedimentary Rock > Clastic Sedimentary Rock > Sandstone |
| Rock unit name | Quimsa Cruz (Tres Cruces) Batholith |
| Rock description | Quimsa Cruz (Tres Cruces) Batholith |
| (1) | -67.63561, -16.87268 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | On Both Flanks Of N10-20w Viloco Syncline On Western Fringe Of The Loligo-Emio Tres Cruces Batholith |
| Strike | N 60 E |
|---|---|
| Dip | VERTICAL |
| Development status | Producer |
|---|---|
| Commodity type | Metallic |
| Significant | No |
| Discovery year | 1902 |
| Year of last production | 1985 |
| Type | Operator |
|---|---|
| Owner | Empresa Minera De Araca . Empresa Minera Viloco (Comibol Subsidiary . Upper Levels |
| First year | 1926 |
| Last year | 1952 |
| Type | Owner |
|---|---|
| Owner | Empresa Minera De Araca ; Corporacion Minera De Bolivia (Comibol) |
| First year | 1926 |
| Last year | 1952 |
| Type | In-situ | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Estimate year | 1990 | ||||||||||||||
| Total resources | 90930000mt ore | ||||||||||||||
| |||||||||||||||
| Type of workings | Underground |
|---|---|
| Overall depth | 625M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | DE00333 | |
| USGS | International Strategic Minerals Inventory | ISMI | W055 |
WILLIG, C.D., AND DELGADO, J., 1985, SOUTH AMERICA AS A SOURCE OF TUNGSTEN, PAPER PRESENTED AT THE THIRD INTERNATIONAL TUNGSTEN SYMPOSIUM, MADRID, SPAIN, 36 P.
VALENZUELA, S.R., 1979, GEOLOGY OF THE MAIN WOLFRAM MINES IN BOLIVIA, PRIMARY TUNGSTEN ASSOCIATION, BULLETIN NO. 6, FEB. 1979, P. 8.
AHLFELD, F., AND SCHNEIDER-SCHERBINA, A., 1964, LOS YACIMIENTOS MINERALES Y DE HIDROCARBUROS DE BOLIVIA: DEPARTAMENTO NACIONAL DE GEOLOGIA BOLETIN 5, P. 139-141.
WILLIG, C.D., AND DELGADO, J., 1985, SOUTH AMERICA AS A SOURCE OF TUNGSTEN, IN MPR PUBLISHING SERVICES LTD., (ED.), TUNGSTEN: 1985, PROCEEDINGS OF THE THIRD INTERNATIONAL TUNGSTEN SYMPOSIUM, MADRID, MAY, 1985, P. 58-85.
GUSTAVSON ASSOC., 1992, COMPENDIUM OF THE ECONOMIC GEOLOGY OF BOLIVIA
ANNUAL ITEMS 1 TO 5: WILLIG, C.D., 1985, P. 24. ANNUAL ITEMS 6 TO 8: GUSTAVSON ASSOC. (1992). CUM ITEM 1: VALENZUELA, S.R., 1979, P. 8. CUM ITEM 2: AHLFELD AND SCHNEIDER-SCHERBINA (1964), P. 141. CUM ITEMS 3-4: MINISTRY OF MINES.
| Subject category | Comment text |
|---|---|
| Deposit | VEINS UP TO 1.5 M WIDE. LATERAL ZONING WITH MOLYBDENITE-WOLFRAMITE-SCHEELITE IN THE CONTACT ZONE, PASSING OUTWARD INTO CASSITERITE-SCHEELITE-BASE METAL ZONE. SN MINERALIZATION EXTENDS FROM 500 TO 2000 M OUTWARD FROM THE CONTACT ZONE. ORE SHOOTS AT VEIN INTERSECTIONS WITHIN SANDSTONE PITCH 35-50 SW. THE MAIN ORE SHOOT WAS 500 M LONG AND 55O M DEEP. VEINS ARE OXIDIZED (CASSITERITE ONLY) TO ABOUT 400 M DEPTH. SN CONTENT DIMINISHES GRADUALLY WITH DEPTH IN THE SULFIDE ZONE. ABOUT 80% OF PRODUCTION CAME FROM MAIN ORE SHOOT. A TOTAL OF 14 VEINS, MOSTLY NARROW, WERE PRODUCTIVE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-SEP-1985 | Pasitschniak, Anna | Geological Survey of Canada | |
| Updater | 01-DEC-1993 | Long, Keith R. | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.