The collection consists of ledgers, account books, and sales receipts of merchants in Dawson City, Yukon, during the Klondike Gold Rush as well as correspondence, purchasing records, and production records for several placer mining companies in and around Dawson City in the 1940s and 1950s. The records of Klondike-era merchants include those of Marcus Rosenthal and Company, Barrett and Hull (1901-1904), William Barrett, Klondike Thawing Machinery Company (1911-1926), Landhal's Emporium (1906), and Rook Brothers (1905-1906). Records of placer mining companies include those of Clear Creek Placers Ltd. (1941-1956), Yukon Gold Placers Ltd. and subsidiary companies (1941-1956), Canadian Placers Ltd. (1940-1941), and Spruce Creek Placers Ltd. (1941-1956).