Collection, 1788-1857, assembled by Erastus Hurd consists of one military commission from 1788 as well as papers related to the Charter Oak Mining Company. These papers include articles of association, Hurd's contract to provide maps, notes and a report on mining prospects in the Upper Peninsula of Michigan, instructions for Hurd to act as an agent for the Charter Oak Mining Company and a list of stockholders and eight stock certificates for stock owned by Hurd.

Papers, 1905-2019, of Dana Richter, former faculty member of Michigan Technological University’s School of Forest Resources and Environmental Science and local Copper Country historian.

Records, 1854-1963, of the Indiana Mining Company. Originally established as the Indiana Copper Company, the records Include articles of incorporation, by-laws and minutes.