Before electricity was widely used in underground mining, mules were used to transport loads of ore. By 1910, it is estimated at least 1,000 mules and horses were working underground. By 1918, electricity began to phase out the use of mules underground, and in 1934, the last mules were pulled out of the mines. Once brought underground, mules would not come to the surface again until they were no longer fit to work. Once retired, Butte’s mules could graze in a pasture near Anaconda.
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