Likewise the extension of the railroad network up the Roaring Fork Valley to the previously failed mining town of Aspen in the late 1880s made the extraction of silver ore there economically feasible, and saved the town from near extinction.
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The prospector Charles Senter discovered and claimed the outcropping of molybdenite (molybdenum sulfide) veins in 1879, during the Leadville, Colorado, Silver Boom, but he had no idea what the mineral he found was.