Monthly bulletin of the International Bureau of the American Republics, International Union of American Republics . ^ occur in fissure veins, and thegangue consists principally of quartz, clay talc, and porphyry. Thevalues are largely held by ciystalline quartz, which occurs in all itsvarieties, from the pure white and barren to the highly mineralized,carrying sulphides of the base metals in varying proportions and inrarer cases manganese, arsenic, and antimony. Ores presenting highlyrefractory features are rare. The remaining gangue often carries goldwhich has been freed from the quartz by aq
Monthly bulletin of the International Bureau of the American Republics, International Union of American Republics . ^ occur in fissure veins, and thegangue consists principally of quartz, clay talc, and porphyry. Thevalues are largely held by ciystalline quartz, which occurs in all itsvarieties, from the pure white and barren to the highly mineralized,carrying sulphides of the base metals in varying proportions and inrarer cases manganese, arsenic, and antimony. Ores presenting highlyrefractory features are rare. The remaining gangue often carries goldwhich has been freed from the quartz by aqueous agencies, to which INTEKNATIONAL BUREAU OF THE AMERICAN REPUBLICS. 1027 the oxidation of the ]) metals and tlic crunil)ling of the quartz wasprobably due. The percentage of silver values in the auriferous oresI have examined is comparatively small, but it is said there are somerich silver ores. history. Lost and perilous expeditions, intrigues, persecutions, and othercauses, especially the marine disaster suffered ])y th(i governor of. Mining districts of Costa Ricii. 1. Monte de Aguacate. 2. Monte de Oro. 3. Abangares District. Costa Rica, Juan Vazquez de Coronado, occasioned much delay in thedevelopment of the first mineral discoveries. This was retarded alsoby frequent invasions by the Talamancas and other Indian two centuries prior to 1815 but four mineral denouncementsare of record, and but two of these are located. The first discovery affecting the principal mines known to-day wasmade in the district of Aguacate Mountain (then called El Torroto)by the Spanish Bishop Garcia, bishop of Costa Rica and Nicaragua,while crossing the mountain over the old trail which connected Car- 1028 INTERNATIONAL BUREAU OF THE AMERICAN REPUBLICS. tago, the destiny of the bishop on this journey, with other importantprovinces within his dominion. The principal residence of the bishopwas then in Nicaragua, and a visit from him to Costa Rica was a nota-ble event. In this
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