Mine detail: El Frances Mine

Location:	Guanacaste, Costa Rica, North America
Lat / long:	10.4955, -85.70413
dep_id:	10097769
mrds_id:	CS00021
Commodity type:	metallic
Major mineral:	Manganese
Operation type:	Unknown
Production size:	Small ammount of material produced
Development status:	Past Producer
ore:	Braunite, Psilomelane, Pyrolusite, Wad
orebody_fm:	LENTICULAR TO IRREGULAR
model:	97: Volcanogenic Mn
alteration:	Silicification
Reporter:	Howe, Stephen S., Mosier, Dan
hrock_type:	Shale
arock_type:	Basalt
tectonic:	Nicoya Ophiolite Complex
References:	Deposit:: SEARS, J. D., 1919, DEPOSITS OF MANGANESE ORE IN COSTA RICA: U.S. GEOL. SURV. BULL. 710-C, P. 78. Deposit:: ROBERTS, R. J., 1944, MANGANESE DEPOSITS IN COSTA RICA: U.S. GEOL. SURV. BULL. 935-H, P. 408-410. Deposit:: KUYPERS, E. P., AND DENYER CH., PERCY, 1979, VOLCANIC EXHALATIVE MANGANESE DEPOSITS OF THE NICOYA OPHIOLITE COMPLEX, COSTA RICA: ECON. GEOL., V. 74, P. 672-678. Deposit:: HEIN, J. R., KUIJPERS, E. P., DENYER, PERCY, AND SLINEY, R. E., 1983, PETROLOGY AND GEOCHEMISTRY OF CRETACEOUS AND PALEOGENE CHERTS FROM WESTERN COSTA RICA, IN IIJIMA, A., HEIN, J. R., AND SIEVER, R., EDS., SILICEOUS DEPOSITS IN THE PACIFIC REGION: AMSTERDAM, ELSEVIER SCIENTIFIC PUB. CO., P. 151, 153. 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.