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Location: 55 NW from Tucson, Arizona, United States
25000 W. Avra Valley RoadMaranaArizona, United States85653
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Mining scale, mining and mill throughput capaciites.Full profiles of select mines and projects.
Shaft depth, mining scale, backfill type and mill throughput data.Full profiles of select mines and projects.
Equipment type, model, size and quantity.Full profiles of select mines and projects.
Camp size, mine location and contacts.Full profiles of select mines and projects.
Asarco LLC includes the Mission, Ray and Silver Bell Arizona mines.
The Silver Bell mine is operated by Silver Bell Mine, LLC ("SBM") of which AR Silver Bell, Inc. ("AR SB") maintains 100% of its capital stock of which ASARCO, LLC maintains 100% of its capital stock.
(Translation from Spanish)The Silver Bell district in Arizona provides a good example of various electrical and electromagnetic methods applied to the same porphyry copper deposits. Lowest resistivities in the Silver Bell area corresponded with the quartz monzonite porphyry and with zones of sericitic alteration. Likewise, highest IP responses were associated with sericitic alteration. The low resistivities at Silver Bell are caused by the strongly fractured nature of the porphyry system, particularly in sericitic zones, and its interconnected sulfide veinlets. Sericitic zones are highly conductive because of intense fracturing, abundant pyrite mineralization, and sericitic alteration. The higher resistivities of the potassic zone, on the other hand, reflect silicification, disseminated sulfides (as opposed to sulfides deposited in veinlets), and overall less abundant sulfide and clay minerals. Propylitic zones are less fractured and have much lower total sulfides and, thus, higher resistivities. Resistivity weakly correlates with the leached cap and underlying zones of enrichment.Copper-porphyry mineralization is concentrated over several quartz monzonite porphyry domes and porphyry-cogenetic dykes of Laramide age (69-63 Ma) that were emplaced on a west-northwest-striking structure known as the Silver Bell fault zone. 11 kilometers and include the Oxide, West Oxide, El Tiro and North Silver Bell deposits. The mineable porphyry deposits contain the mineral chalcocite, disseminated and enriched in supergenes and with fracture control and associated copper oxide mineralization. Paleozoic carbonate rocks contain hydrothermal skarn deposits with chalcopyrite adjacent to mineralized porphyry deposits. High-grade Ag-Pb-Zn-Cu skarn ore was mined during large-scale underground operations in the pre- and post-mining years of the area. All known copper deposits lie within a long zone of disseminated pyrite up to 13 kilometers long and from less than 152 meters to over 2.4 kilometers wide.
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