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The Lucky Friday mine is an underground silver, lead, and zinc mine near Mullan, Idaho, it is operated by Hecla Mining company. Lucky Friday is one of the few mines remaining operational in the silver valley, producing 1000 tons of ore per day, the ore deposit type is Polymetallic veins of hydrothermal origin, the mining method used is underhand cut and fill mining. The mine's primary access and production are through the Silver Shaft, an 18 feet (5.5m) diameter, concrete lined shaft sunk to a depth of 6,200 feet (1,890m).
Lucky Friday mine Wikipedia
The mine is located one mile east of Mullan, Idaho in the Coeur d’Alene Mining District.
The geology is Precambrian meta‐sedimentary rocks and forms veins ranging in width from 4 to 20 feet in width extending down over 6,000 feet. The ore is bleached by hydrothermal processes and extend downwards in veins at a 75 degree angle.
The mine was discovered in 1880 by J.F. Ingalls, Production started in 1942.