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NATIONAL HISTORIC LANDMARK In terms of production, the Jumbo Mine was the largest of the Kennecott mines. It opened in 1913 and had its own 16,000 foot tramway to the Kennecott Mill. Exploration for additional ore began in 1917. A 5,000 foot long drift was driven between the Jumbo and Bonanza Mines in an effort to discover new ore bodies. An extension of the Bonanza-Mother Lode Vein system was intersected by this tunnel. Eventually, that vein was mined for over 3,300 feet along the slope of the bedding. A second drift, 12,000 feet long, was driven between a deeper level of the Jumbo Mine to the adit level of the Erie Mine. This drift intersected three additional ore bodies. This drift was ultimately extended in the opposite direction to the Mother Lode Mine. CLICK HERE For Photo Gallery 4 |

