Granite Mountain Mine

Alexander Street, Butte, MT

Underground copper mine operated circa 1909 - 1944


Granite Mountain Mine

Photo taken by Richard Doody in July 2006



The North Butte Mining Company purchased the Granite Mountain Mine from Adolph Lewisohn in 1909. Over the next 5 years the Granite Mountain shaft was sunk from the initial 500 feet down to 2800 feet, the same level as the Speculator shaft. In 1915, the Granite Mountain shaft became the operating shaft, with the Speculator shaft being maintained as backup and as ventilation.

The first major accident at the Granite Mountain Mine occurred on October 19, 1915, when part of a dynamite shipment of was ignited accidentally on the surface next to the Granite Mountain shaft, killing 15 miners.

On June 9, 1917 a spark from a carbide lamp ignited the oil soaked insulation of a damaged cable. Smoke from the fire quickly spread throughout the Granite Mountain and into the adjoining Speculator Mine. It became the deadliest accident in the history of American hard rock mining. One hundred sixty eight miners lost their lives. Sixty five of these were burnt beyond recognition and were buried in a mass grave at Mountain View Cemetery.


Mine (154)
Montana (1,624)
Silver Bow County, Montana (138)

Update Log 

  • July 12, 2018: Added by Richard Doody


  • Richard Doody