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The fonds consists of the records of the Britannia Beach Mining and Smelting Company and related companies (Britannia Copper Syndicate , Britannia Smelting Company, Chelan Copper Mining Company, El Potosi Mining and Howe Sound Exploration and Howe Sound Company). The fonds includes annual reports, correspondence, accounting records, exploration records, engineering plan, leases, contracts, agreements, photographs, maps, and one fire insurance plan.