The collection consists of the records of the Oregon Copper Company, which owned mines in Baker County, Oregon. These records include correspondence of and between manager John Arthur and board member C. B. Handy, financial records, maps and plans of mining sites, reports to and correspondence with stockholders, and summaries of the company's operations. The collection also contains correspondence and schematics relating to mining equipment designed by Lyle McLean; materials relating to the Clover Creek Consolidated Mining Company and the Balm Creek Gold Mining Company, which Arthur also managed; and photographs of mine shafts at the Balm Creek mining site.