Mine detail: Negrillos Mine

Previously called 'La Plata'

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Location

Lat / long:

-18.83819, -68.62785

Resource(M)

Primary:	Silver
Tertiary:	Lead, Zinc, Copper, Manganese
Ore:	Chalcopyrite, Galena, Polybasite, Pyrargyrite, Sphalerite, Tetrahedrite
Gangue:	Chalcedony, Pyrite, Quartz, Rhodonite
Orebody form:	IRREGULAR
Discovery year:	1600

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1600

Geology

Host type:	Tuff,Andesite
Associated type:	Tuff,Andesite
Structure:	N-S Syncline With Axis 1 Km W Of Town Of Negrillos, N80e 65n Fault Zones
Alteration processes:	Argillic, Propylitic. Ore Is Oxidized From 8 To 15 M Depth.

References

MRDS	BL10009
DEP	10005848
Reference	{Deposit:: AVILA SALINAS BALDIVIESO, WALDO ARTURO, 1965, GEOLOGIA DEL DISTRITO MINERO DE CARANGAS Y SUS ALREDADORES: UNPUBLISHED TESIS DEL GRADO, UNIVERSIDAD MAYOR DE SAN ANDRES, FACULTAD DE CIENCIAS GEOLOGICAS, 150P., MAP 1:50,000.}{Deposit:: GUERRA, M., URIBE, H., AND OTAZO, N., 1965,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.}{Deposit:: GEOLOGICAL INVESTIGATIONS BY GUERRA ET AL (1965)}{Deposit:: THESIS BY AVILA-SALINAS (1965)}{Deposit:: VISITED BY USGS/GEOBOL GEOLOGISTS SEPT 1990}{Other Database:: CIMRI}
Reporter	Long, Keith R., Ratte, Jim And Gamble, Bruce