La Fortuna Prospect

ASHLEY, B. E., 1967, THE MINERAL INDUSTRY OF COSTA RICA, IN MINERALS YEARBOOK 1967: U.S. BUREAU OF MINES YEARBOOK, V. 4, P. 900.ASHLEY, B. E., 1968, THE MINERAL INDUSTRY OF COSTA RICA, IN MINERALS YEARBOOK 1968: U.S. BUREAU OF MINES YEARBOOK, V. 4, P. 847.ASHLEY, B. E., 1969, THE MINERAL INDUSTRY OF COSTA RICA, IN MINERALS YEARBOOK 1969: U.S. BUREAU OF MINES YEARBOOK, V. 4, P. 833.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.