Mineral Resources of Colombia (other than Petroleum) By QUENTIN D. SINGEWALD GEOLOGIC INVESTIGATIONS...PRINTING OFFICE, WASHINGTON i 1950 UNITED STATES DEPARTMENT OF THE INTERIOR Oscar L. Chapman, Secretary ...mine________________________________-_______ Guayaquil mine ___________________________________________ Cau...ILLUSTRATIONS Page PLATE 5. Index map of part of Colombia, South America _______ In pocket 6. Map showing...asbestos, iron, manganese, mercury, and sulfur, Colombia _________ In pocket 7. Map showing principal sources |