Oliver Mining Company steam-powered shovel near Hibbing

Oliver Mining Company steam-powered shovel near Hibbing, 1919. A shovel removes overburden, the rock and soil that covers the ore body, so that miners can access the ore from the open pit.

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Oliver Mining Company steam-powered shovel near Hibbing, 1919. In this method of mining, a shovel removes overburden, the rock and soil that covers the ore body, so that miners can access the ore from the open pit.

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