Butte Montana North Butte Mining Co Ledger

Updated August 7, 2026

Lot number736
Estimate100.00 - 150.00 USD
AuctionThe Richest Hill on Earth - Day 1
DateAugust 13, 2026 at 9:59 PM MDT
Auction houseDavis Brothers Auction
LocationMissoula, Montana

Granite Mountain Speculator Mine. The Granite Mountain/Speculator Mine disaster of June 8, 1917, occurred as a result of a fire in a copper mine, and was the most deadly event in underground hard rock mining in United States history. Most men died of suffocation underground as the fire consumed their oxygen; a total of 168 miners were killed.

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