Rio Zongo

FREYDANCK, H.G., 1965, THE GOLD PLACER DEPOSITS AT THE FOOT OF THE EASTERN CORDILLERA OF BOLIVIA; A REPORT ON THE EXPLORATION ACTIVITIES BETWEEN THE YEARS 1963 AND 1964: LA PAZ, BOLIVIA, DEPARTMENTO NACIONAL DE GEOLOGIA.ORRIS, G.J. AND BLISS, J.D., 1985, GEOLOGIC AND GRADE VOLUME DATA ON 330 GOLD PLACER DEPOSITS: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 85-213, 172 P.CIMRIORRIS AND BLISS, 1985.