Mine detail: La Union Mine

Previously called ''

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Location

Lat / long:

10.15802, -84.72077

Resource(M)

Primary:	Gold
Secondary:	Silver
Gangue:	Chalcopyrite, Galena, Pyrite, Quartz, Sphalerite
Orebody form:	VEIN

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence

Geology

Host type:	Andesite
Associated type:	Plutonic Rock
Alteration processes:	Silicification Of Andesite Locally Near Quartz Veins And Development Of Chlorite, Sericite, And Calcite With Lt 1 % Disseminated Pyrite.

References

MRDS	CS00141
DEP	10007906
Reference	{Deposit:: REITZ, M. F., 1902, THE GOLD MINES OF COSTA RICA: ENG. MIN. J., V. 74, P. 212.}{Deposit:: BENNETT, EVAN, 1939, GOLD MINING IN COSTA RICA: ENG. MIN. J., V. 140, P. 56-58.}{Deposit:: DIRECCION GENERAL DE GEOLOGIA, MINAS E HIDROCARBUROS (DGMH) UNPUBLISHED FILES VIEWED 1986.}{Deposit:: VISITED BY USGS SCIENTISTS, 1986. ORGANIZACION DE LOS ESTADOS AMERICANOS, 1978, DIAGNOSTICO DEL SECTOR MINERO: SAN JOSE, ORGANIZACION DE LOS ESTADOS AMERICANOS, 91 P.}{Deposit:: U.S. GEOLOGICAL SURVEY, DIRECCION GENERAL DE GEOLOGIA, MINAS E HIDROCARBUROS, UNIVERSIDAD DE COSTA RICA, 1987, MINERAL RESOURCE ASSESSMENT OF THE REPUBLIC OF COSTA RICA: U.S. GEOLOGICAL SURVEY MISCELLANEOUS INVESTIGATION SERIES MAP I-1865, 75 P.}
Reporter	Howe, Stephen S. (Cox, Dennis P.), Mosier, Dan