E/MJ : engineering and mining journal . ich ores characterized by the presei >f rhodonite and rhodo- chrosite. Still another type is illustrated bj the Chur-ruca mine, which seems to be an irregular replacementin limestone. The chief copper mineral is from the mines visited, chalcopyrite is morecharacteristic of the ores in limestone, occurring in bulvery small quantity in those in the igneous rock. Theconditions of occurrence of enargite are almosl the oppo-site, whereas tetrahedrite is found abundantly in and quartz arc the most abundant minerals andare al
E/MJ : engineering and mining journal . ich ores characterized by the presei >f rhodonite and rhodo- chrosite. Still another type is illustrated bj the Chur-ruca mine, which seems to be an irregular replacementin limestone. The chief copper mineral is from the mines visited, chalcopyrite is morecharacteristic of the ores in limestone, occurring in bulvery small quantity in those in the igneous rock. Theconditions of occurrence of enargite are almosl the oppo-site, whereas tetrahedrite is found abundantly in and quartz arc the most abundant minerals andare always present, while rhodochrosite and rhodonite arelocal in their occurrence. Galena is no1 verj abundantin the copper ores, 1ml in some of the mines sphalerite oc-curs in large quantity. Characteristics of the Mines In the preceding paragraphs the general characteristics of the ores and ore deposits have been summarized, and it is now proposed to describe briefly some of the mor important mines in order to bring out more clearly those. MAP OF CENTRAL PART OF MOROCOCHA DISTRICT,SHOWING PRINCIPAL MINES features. The situations of the mines are shown on theaccompanying man. The mines of the Morococha .Min-ing Co. will be described first. The San Francisco mine is the most important pro-ducer of the district. It is working a system of branchingveins with an east-west strike and variable dipfrom 60° N. to 70 S. Owing to the inadequaithe pumping facilities to handle all the water, a numberof the veins have been bulkheaded and work is con-fined to the two most- important, known as Nos. I and are worked through a shaft in which level 1 is atthe level of Morococha Lake and the lowest level, 5, atthat of the drainage tunnel being driven to unwater themine about 400 ft. lower. The filling of vein ! consists chieflj of pyrite withenargite and contain- bu1 lit! I much gangue. The walls are usually well defined with a dis-tinct parting. Vein 6 differs from vein 1 in carryingenargit
Size: 2140px × 1167px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
