Copper ore mined and copper metal extracted at a copper mine in Montana, United States.
Montana United States USA Date:1928 Duration:3 min 16 sec Sound:NO SOUND
Documentary titled 'The Inside Story of Your Telephone'. Describes raw materials used in telephone manufacturing. Dynamite crew places dynamite at a copper mine in Montana, United States. Miners shovel the blasted ore onto ore cars. Ore is loaded into converters. Slag is poured off. Stacked bars of pure electrolytic copper. Picture of a telephone made of copper.
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