| Reference | {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:: 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.} |