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A large stope in the
Treadwell gold mine, Douglass Island, Alaska, 1908. A stope is an excavated underground cavity. The stopes at Treadwell were left mostly full of broken ore to provide a place for the miners to stand as they excavated upwards, then emptied when completed. Thick walls were left as
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358:{{Information |Description={{en|1=A large stope in the Treadwell gold mine, Douglass Island, Alaska, 1908. A stope is an excavated underground cavity. The stopes at Treadwell were left mostly full of ore to provide a place for the miners to stand as they
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occurred prior to
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Mining and
Scientific Press, San Francisco, 1909 p31.
78:(2,360 × 1,571 pixels, file size: 727 KB, MIME type:
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pillars between stopes to support the rock overhead.
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