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).

The author of the #1 New York Times bestseller, The Revenant -- basis for the award-winning motion picture starring Leonardo DiCaprio -- tells the remarkable story of the worst hard-rock mining disaster in American history. A half-hour before midnight on June 8, 1917, a fire broke out in the North Butte Mining Company's Granite Mountain shaft. Sparked more than two thousand feet below ground, the fire spewed flames, smoke, and poisonous gas through a labyrinth of underground tunnels. Within an hour, more than four hundred men would be locked in a battle to survive. Within three days, one hundred and sixty-four of them would be dead. Fire and Brimstone recounts the remarkable stories of both the men below ground and their families above, focusing on two groups of miners who made the incredible decision to entomb themselves to escape the gas. While the disaster is compelling in its own right, Fire and Brimstone also tells a far broader story striking in its contemporary relevance. Butte, Montana, on the eve of the North Butte disaster, was a volatile jumble of antiwar protest, an abusive corporate master, seething labor unrest, divisive ethnic tension, and radicalism both left and right. It was a powder keg lacking only a spark, and the mine fire would ignite strikes, murder, ethnic and political witch hunts, occupation by federal troops, and ultimately a battle over presidential power.

Scattered records of Bald Butte Mining and Milling Company and its predecessor the Bald Butte Mining Company. Records consist of annual reports to stockholders (1895-1896); a cash book (1917-1930); a ledger (1911-1938) payroll accounts (1907-1923); and miscellany.

The North Cliff Mining Company records consist of correspondence from the Pittsburgh office of the company, written by Thomas M. Howe, Secretary, and H. Holdship, Secretary-Treasurer. Correspondence takes place from October 13, 1858 to May 5, 1875.