The Crevasse Mountain Mining Company was a Park County, Montana, mining operation. Officers included P.F. Barr, Erastus E. Edgerton, and John Edgerton. This collection (1890-1893) consists of general correspondence, financial records, legal documents, and superintendent reports on mine operations.

Collection consists of one volume of records created by the Glen Mining Company of White Sulphur Springs from 1891-1894. Includes four annual Trustees meeting minutes, as well as special meeting minutes held between April 1891 and April 1894, as well as the by-laws of the company. Also includes two examples of the company's stock certificates. (SC 2727)

Business records of North Butte Mining Company. Core of the collection consists of interoffice correspondence (1906-1923) between the general manager in Butte, Mont., and the president and secretary-treasurer in Duluth, Minn., and New York. The correspondence includes annual and quarterly reports and weekly letters which all describe development work and production in considerable detail. The remainder of the interoffice correspondence deals with general problems of operation of the mines. There is also general correspondence (1906-1907, 1914-1926) with equipment suppliers, other mining companies, and a wide variety of other letters. Of special interest are files of letters inquiring about possible victims of the Granite Mountain and Speculator disasters. In addition, there are a small number of assay reports, ore shipment statements, and estimates of ore reserves; legal documents; lists of mining claims; articles of incorporation; and a scrapbook of clippings about the Granite Mountain Mine explosion (1915) and fire (1917).