Documents from the G. M. Colvocoresses mining collection. Description: Claims and cross section maps, report with assays by Dundas, notes by Colvocoresses, report by Thede, report with assays by Crabtree, data pertaining to tonnage and ore values of the Golden Gem Mine by Crabtree, Gem Mine data and cost of treating mine fill and dump, O'Brien blanket vein data and cost of treating.
