Perhaps the most prominent feature of underground mines is the headframe: this structure sits atop the shaft, and allows miners and materials to enter and exit the mine. Above is the headframe for the No. 9 shaft at BHP's Superior mine.
Perhaps the most prominent feature of underground mines is the headframe: this structure sits atop the shaft, and allows miners and materials to enter and exit the mine. Above is the headframe for the No. 9 shaft at BHP's Superior mine.
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