 | | Journal (article/letter/editorial) | | Molybdenite Mineralization at the El Teniente Cu-Mo Porphyry Deposit, Chile Edward T. Spencer,1,†Jamie J...División El Teniente, Rancagua, Chile Abstract The El Teniente Cu-Mo porphyry deposit, Chile, is one...of diorite finger porphyries and the composite Teniente Dacite Porphyry. These units acted as effective...veins and breccias. These are abundant at shallow mine levels and show a close spatial relationship with...series of concentric faults associated with the Braden Breccia Pipe. Mineralization in this paragenetic |  | | Journal (article/letter/editorial) | | distribution of Rb near porphyrycopperdepositsin Chile showthat: (a) Positive Rb anomaliesexist in rocks... The mineralized interval consistsof a rhyolite mine its size and shape. lapilli tuff to tuff brecciahavinga...Potossic El i 386 Alteration of Docite of i I 200 I • ?•00 600 Porphyry I I 50 Teniente 100 ...the adjacentwall rocks. sericite,calcite,epidote,apatite,and pyrite. In zone The watershave low K/Rb ratios...the K/Rb ra- the rocks. Discussion Senecaand El Teniente deposit All of the 19 samplesfrom the Senecadepositcontain |  | | Journal (article/letter/editorial) | | magnetite, and anhydrite, along with minor ruffle and apatite, are other important mineralogicalconstituentsof...Panguna. The nature of the about 1 cm in dialneter. mine intrusives and their relationshipto both contem...grouped togetheras late, postperiod of intrusionin the mine region is considered tive assemblages K-silicate...selvagesco•nprisefrom most of total rock near •nine mine porphyries porphyriesto < 1% near outer limit of...when present. Kaverong Quartz Area adjacent to mine porphyries Biotite-chlorite-K-feldspar-magnetite-anhydrite |  | | Report (issue) | | performed by the author and by F. Elsass and A. H. El Bazli. Copper, lead, zinc, gold, silver, nickel,... G. I. Seiner (USGS Computer Section), and A. H. El Bazli (USGS technician) is gratefully acknowledged...individual multiphase intrusions, constitute a tin province in which tin and niobium deposits are confined...studying three major porphyry copper deposits in Chile, Armbrust and others (1977) concluded that rocks...low K/Rb ratios. For example, at the El Teniente (Braden) mine, rubidium contents range from an average |  | | Book | | Orogen . 3 ¢ Radiometric Ages Near El Salvador and Potteriics, Chile . 4 ¢ Section Through Arequipa, Peru...Through Potrerillos, Chile . ; 6 ¢ Potash Index of Igneous Rocks, Atacama Rego Chile : 7 ¢ Michiquillay...Geology (Peru) . 8 © Structure at Chuquicamata, Chile . 9 ¢ Surface Geologic Map, Michiquillay 10 © Surface...Plutonic Belt, ies 27 @ Geology of the Kobuk-Koyukuk Province (Alaska). 28 © Interior Belt (Alaska). 3 ; ,...: tbe ge genes ie a Structure Visible in Gurr at El Nie : Structural Outline at Copper Basin. ; 48 ¢ |  | | Report (issue) | | Geochemical and geophysical investigations around Garras Mine, near Truro. Cornwall 3 4 Molybdenite mineralisation...associated with the Skiddaw Granite near Carrock Mine, Cumbria 8 Investigation of stratiform sulphide...Scotland 38 10 Geophysical surveys around Talnotry mine, Kirkcudbrightshire, Scotland Geophysical evidence...specimens, and is partly replaced by hornblende. Apatite, sphene and opa ques occur as accessory minerals...after biotite. In addition to the opaque oxides, apatite occurs as an accessory mineral. 3 MINERAL/SA |  | | Book | | ) occur as well as phosphate minerals such as apatite, Ca 5 (PO 4 ) 3 (OH,F). Sulfur usu- INTRODUCTION... INTRODUCTION 6 TABLE 1-2 Formula Comments Apatite Ca 5 (PO 4 )J(OH,F) Pyrite FeS 2 Calcite CaCO 3 ...used. Where high-grade ore occurs at some depth, a mine shaft may be sunk and drifts (tunnels) run from...setting, which may be referred to as a metallogenic province. The porphyry copper belt in the western part...North and South America is one such well-defined province, as is the sedimentary copper belt in Zambia-Zaire |  | | Book | | disseminating the information, the mine geologists and mine managers who have made the mine visits a rewarding experience...concentration required to achieve the break-even point for a mine in terms of revenue and costs. Any detailed exploration...epochs. Following Tumeaure (1955), a metallogenic province may be defined as a mineralized area or region...The size of a metallogenic province can be as large as the Superior Province (Canadian Shield) or as small...as the Upper Michigan Peninsula native copper province. Similarly, a metallogenic epoch can be as broad |
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