| Deposit ID | 10005848 |
|---|---|
| MRDS ID | BL10009 |
| Record type | Site |
| Current site name | Negrillos Mine |
| Alternate or previous names | La Plata |
| Geographic coordinates: | -68.62785, -18.83819 (WGS84) |
|---|---|
| Elevation | 3900 |
| Relative position | 14 KM N OF CARANGAS, 207 KM BY ROAD FROM ORURO |
Political divisions (FIPS codes)
Oruro(province)
Bolivia(country)
South America(continent)
Land(continent)
Federal lands
Federal(land status)
| Country | State |
|---|---|
| Bolivia | Oruro |
| Commodity | Importance |
|---|---|
| Silver | Primary |
| Lead | Tertiary |
| Zinc Critical | Tertiary |
| Copper | Tertiary |
| Manganese Critical | Tertiary |
| Materials | Type of material |
|---|---|
| Chalcopyrite | Ore |
| Galena | Ore |
| Polybasite | Ore |
| Pyrargyrite | Ore |
| Sphalerite | Ore |
| Tetrahedrite | Ore |
| Chalcedony | Gangue |
| Pyrite | Gangue |
| Quartz | Gangue |
| Rhodonite | Gangue |
| Result | ORE ANALYSES BY GUERRA ET. AL. (1965): OXIDE ORE: 5 SAMPLES, CHANNELS UP TO 22 CM, 3.87% PB 1.04% ZN 800 G/T AG, VEIN SULPHIDE ORE: 2 SAMPLES, CHANNELS UP TO 19 CM, 3.35% PB, 7.4% ZN, 1040 G/T AG |
|---|---|
| Result | DISSEMINATED SULFIDE ORE: 4 SAMPLES, CHANNELS UP TO 26 CM, 2.0% PB 26.0% AN 270 G/T AG |
| Result | TAQUEOS: 1 GRAB SAMPLE, 1.2% PB 400 G/T AG. USGS (1990): UP TO 1000 G/MT AG, 20% PB, 10% ZN, 0.7% CU |
| Model code | 77 |
|---|---|
| USGS model code | 20b |
| Deposit model name | Sn-polymetallic vein |
| Host or associated | Associated | ||
|---|---|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff | ||
| |||
| Host or associated | Associated |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite |
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff |
| Host or associated | Host |
|---|---|
| Rock type | Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite |
| (1) | -68.62785, -18.83819 |
|---|
| Type of structure | Regional |
|---|---|
| Structure description | N-S Syncline With Axis 1 Km W Of Town Of Negrillos |
| Type of structure | Local |
| Structure description | N80e 65n Fault Zones |
| General form | IRREGULAR |
|---|---|
| Depth to top | 0M |
| Development status | Past Producer |
|---|---|
| Commodity type | Metallic |
| Deposit size | Small |
| Significant | No |
| Discovery year | 1600 |
| Discoverer | Spanish Colonists |
| Year of first production | 1600 |
| District name | Negrillos |
|---|
| Ownership category | Federal |
|---|
| Type | Owner-Operator |
|---|---|
| Owner | Empresa Minera La Plata |
| Year | 1948 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accuracy | Accurate | ||||||||||||||
| |||||||||||||||
| Year | 1949 | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accuracy | Accurate | ||||||||||||||
| |||||||||||||||
| Year | 1964 | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Accuracy | Accurate | |||||||||||||||||||||
| ||||||||||||||||||||||
| Type of workings | Underground |
|---|---|
| Length | 148M |
| Agency | Database name | Acronym | Record ID | Notes |
|---|---|---|---|---|
| USGS | Mineral Resources Data System | MRDS | BL10009 |
AVILA SALINAS BALDIVIESO, WALDO ARTURO, 1965, GEOLOGIA DEL DISTRITO MINERO DE CARANGAS Y SUS ALREDADORES: UNPUBLISHED TESIS DEL GRADO, UNIVERSIDAD MAYOR DE SAN ANDRES, FACULTAD DE CIENCIAS GEOLOGICAS, 150P., MAP 1:50,000.
GUERRA, M., URIBE, H., AND OTAZO, N., 1965, INFORME SOBRE ORIENTACION TECNICA MINA DE PLATA EMPRESA MINERA LA PLATA: SERVICIO GEOLOGICO DE BOLIVIA INFORME GB-M-463, 13P., MAPS 1:2,000, 1:500.
GEOLOGICAL INVESTIGATIONS BY GUERRA ET AL (1965)
THESIS BY AVILA-SALINAS (1965)
VISITED BY USGS/GEOBOL GEOLOGISTS SEPT 1990
CIMRI
GUERRA ET AL (1965)
| Subject category | Comment text |
|---|---|
| Deposit | DEPOSIT CONSISTS OF THREE VEINS. VETA A AND C ARE ORIENTED N70W 85 NE, ARE 300 M LONG AND 1 TO 40 CM WIDE. VEIN B IS OREINTED N50E 85NW TO VERTICAL, IS 1000 M LONG AND UP TO 1 M WIDE. |
| Type | Date | Name | Affiliation | Comment |
|---|---|---|---|---|
| Reporter | 01-MAY-1990 | Long, Keith R. | U.S. Geological Survey | |
| Updater | 01-DEC-1990 | Ratte, Jim And Gamble, Bruce | U.S. Geological Survey |
Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.