A small adit driven into propylitically altered, augite porphyritic lamprophyre marks the Dos Monumentos showing. In the adits only, minor quartz veining is apparent and a sample taken of the entire working 1.7 m wide face gave 4.7 g Au/t and 6 g Ag/t. The adit strikes toward a zone of metasomatized lamprophyre containing abundant copper oxide alteration that assayed 0.23% Cu, 0.2 g Au/t and 28 g Ag/t, a dump sample below the adit returned 20.1 g Au/t and 88 g Ag/t.
Dos Monumentos
Dos Monumentos
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