This collection is composed primarily of interoffice correspondence and financial records. The former includes letters between Joseph R. Walker and Matthew H. Walker at the Salt Lake City company offices and the company superintendents at the mine in Walkerville. These letters discuss daily operations, national mining issues, equipment used, labor relations, assay results, dealings with Butte business interests, etc. (1877-1940). In addition, the collection contains court papers, legal documents, and organizational materials.