magma-mine-small-superior
Magma No. 1 had been deepened to 800 feet with developmental crosscuts driven on the 500, 600 and 800-foot levels being actively mined by 1912
Magma No. 1 had been deepened to 800 feet with developmental crosscuts driven on the 500, 600 and 800-foot levels being actively mined by 1912
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