File:Transactions (1871) (14765774284).jpg

Identifier: transactionsmining35amer (find matches)
Title: Transactions
Year: 1871 (1870s)
Authors: American Institute of Mining, Metallurgical, and Petroleum Engineers
Subjects: Mineral industries
Publisher: New York (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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T in a general way. The territory below the level of the Victoria tunnel is underlease to the Compania Metalurgica Mexieana. The Guadalupe and Abundancia tunnels are operated by theVictoria company, ores being mined from the San Pedro ElAlto, San Cayetano, and Guadalupe mines through the former,and from the Abundancia through the latter. This companyis producing about 75 tons of ore daily. All other mines are operated by camperos, or short-timelessees, and are largely unsurveyed, since, by reason of frequentcavings and of promiscuous stoping and gophering, a mapwould be too complicated and expensive to have a value com-mensurate with its cost. S(IO THE GOLD-MINES OF THE SAN PEDRO DISTRICT. Fig. 1.
Text Appearing After Image:
Topographic Map of the Mines in the San Pedro District. Tin: Q0LD-MINB8 01 i BE SAN PEDRO DI8TRICI, *>>\ II. Q-BOLO The geological features of the district comprise a bandesite, overlain by limestone, which is «-;i j ► j >< • rea occur on the limestone-andesitei ontact, or in the limestone near the andesite. The latter con-tains small secondary veins, but never lias been found to carrypaying quantities of mineral, although high assay-results havefrequently been obtained from specimens. The contacts and contact ore-bodies occur at every conceiv-able angle, but always exhibit, when explored, a hanging-wallof limestone and a loot-wall of Limestone or andesite. The ancient workings, opened at the outcrops, followed theveins to a maximum vertical depth of 250 meters. Several tun-nels were driven during the 19th century, namely: the Victoriain 1818; the Abundancia and Guadalupe in 1890. In 1903,

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