. Factory and industrial management . nnel was the Burleigh tunnel at Georgetown, Clear Creek county,which was the first tunnel in the State to be driven by machine-drills. The Revenue tunnel (altitude 10,300 feet) is located at the foot ofHendricks mountain in Ouray county, about seven miles from thetown of Ouray (altitude 7,721 feet), the nearest railroad point. Theprimary object of the tunnel was to reach and develop the vein of theVirginius mine and various intermediate veins, carrying both gold andsilver,—principally the latter. The Mrginius mine has undergroundworkings consisting of shaf
. Factory and industrial management . nnel was the Burleigh tunnel at Georgetown, Clear Creek county,which was the first tunnel in the State to be driven by machine-drills. The Revenue tunnel (altitude 10,300 feet) is located at the foot ofHendricks mountain in Ouray county, about seven miles from thetown of Ouray (altitude 7,721 feet), the nearest railroad point. Theprimary object of the tunnel was to reach and develop the vein of theVirginius mine and various intermediate veins, carrying both gold andsilver,—principally the latter. The Mrginius mine has undergroundworkings consisting of shafts sunk from the surface and levels extend-ing from the shafts, aggregating nearly four miles in length, the out-put of gold and silver to date being about $3,000,000. The tunnelwas commenced in the fall of 1887, and completed in 1891, workbeing almost continuous during that period, either on the tunnel itselfor in raises or upward passages run from the tunnel to connectwith the lower workings of the \irginius. The tunnel is 8 feet. MILL AT ENTRANCE OF REVENUE TUNNEL, ALTdUnE IO,3:)^ KEKI. 770 MINING TUNNELS IN COLORADO. square; its total length to the intersection with the Virginius vein is7,800 feet, or more than a mile and a third, from which intersectionthere is an extension on the vein for another half mile. From thisextension the ore in the vein will be taken out from below, finallyworking up in such stoping to a vertical height of over 2,000 feet, fora length along the vein of 7,500 feet, the average width of the veinbeing about 5 feet. The greatest depth of the tunnel is 3,000 is equipped with a double track of 24-inch gage, operated by anelectric motor. The total cost of the tunnel and of the water-powerplant and other appliances immediately connected therewith (exclusiveof mills) was $400,000, of which more than three-fourths was Col-orado capital and the rest New York and Chicago capital. It is usedboth for ore shipments and drainage, and, wi
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Keywords: ., bookcentury1800, bookdecade1890, booksubj, booksubjectengineering
