Word: open-pit
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...rich Lake Superior region, the steam shovels are biting close to the bottom of the vast open-pit iron ore mines, including those in the famed Mesabi Range. Within 17 years the steel industry will have to depend on low-grade iron ores...
...Some open-pit mining of tin ore can be resumed as soon as the Japs move...
From its early shots of the milewide, purplish-red wound which is the Mesabi Range's largest open-pit mine, to the closing clocklike surge of B-17s off their production line into the sky, An American Romance is a cameraman's field...
...money will be used to blast new channels for the Seine River as a preliminary to draining Steep Rock Lake. Most of its 125 billion gallons of water will then be pumped out, its bottom stripped for open-pit mining. The Canadian Government has already appropriated some $5,000,000 for the erection of power lines and the financing of a railroad spur to lead from Steep Rock to Atikokan, which has rail connections with Lake Superior...
...Almost roof-high and room-long in the Mines, Metals and Machinery Building stretches Treasure Mountain, showing open-pit mine operations aboveground, gold and copper mining along 500 feet of underground passageways. Good also: U. S. Steel's diorama of a steel-built San Francisco of 1999; a 555-lb. piano hanging from a thin steel thread...