 | | 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) | | the Chilean porphyry copperdepositsin the E1 Teniente (Braden), Rio Blanco, and Los Bronces (Disputada)...following conclusions, thoughbasedon the study at E1 Teniente, Rio Blanco, and Los Bronces,may alsobe applicableto...distributionof Rb in rocksfroin the leachedcapping at E1 Teniente. Due to this immobility of Rb, weathering of the...phyllic alterationzonesis minerals are K-feldspar, biotite, sericite, quartz, typicallysharp,and may be due...locations of E1 Teniente, Rio Blanco, and Los Bronces mines. Modified from Mapa Geo16gicade Chile, Instituto |  | | Journal (article/letter/editorial) | | hydrothermal amphibole contentsand and Mg/Mg-1-Fe biotite increase ratios toward existthe between ore zone...in other porphyry deposits. Application of the biotite geothermometerof Beane (1974) yields biotitizationtemperaturesin...porphyryorebodies(with the notable exception of secondary biotite, e.g., Jacobs and • Rabaul% • i? J" 5' •...mainlyby secondary biotite, forms an annular zone 1,000 to 1,200 m wide centeredon the Biotite Granodiorite(Fig...gradechalcopyritemineralization(>0.3% Cu) and biotite alteration is the notable feature of the min- |  | | Journal (article/letter/editorial) | | of zonesenrichedin K-bearingminerals(Kfeldspar, biotite, sericite) and Ca-bearingminerals granitoid pluton...monzonite of the alteration(sericite+ K-feldspar- biotite----chlorite) Bethsaidaphase(Fig. 3) (McMillan,...propyliticand potassic(biotite) zones,respectively, in altered andesitesassociatedwith the Braden porphyry copperdeposit...associatedwith plugs and small stocksin which biotite is the dominantpotassic teration mineral (Rose...enhancement of Rb might be associated with intense biotite alteration. Distributionof Rb and Sr is relatedcloselyto |  | | Report (issue) | | Paragneiss, schist, and amphibolite. ....... Biotite tonalite gneiss. ............. Metasedimentary...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...constitute a tin province in which tin and niobium deposits are confined almost exclusively to biotite granite...studying three major porphyry copper deposits in Chile, Armbrust and others (1977) concluded that rocks |  | | Journal (article/letter/editorial) | | soon progressed to shallow depth, resulting in a mine. The numbers of mines and intensity of ACCEPTED...colonialism, modern economic booms (Belich, 2009). Active mine numbers and sizes skyrocketed during two World Wars...rapidly growing number of mineral discoveries and mine establishment was partly driven by the discovery...of conquests and non-military acquisitions. But mine importance and fame did not necessarily correspond...obsolete (for example, recent reserves of a mature mine only, or IP past production for a period of time) |  | | 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...and some of the larger crystals are zoned. Brown biotite is partly altered to chlorite, but green hornblende...ericitisation of feldspars and chloritisation of biotite). Some samp les are granulated (e.g. XDR 135) |  | | 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 |  | | Book | | NaAISi 3 0 8 Anorthite CaAl2 Si2 0 8 Micas Biotite K(Mg,Fe),AlSi30 t0(0H) 2 Muscovite I<(Al 2 )AISi...Accessory Minerals Biotite, ± hornblende, + muscovite Biotite, hornblende Muscovite, biotite Diorite/andesite... hornblende Biotite Syenite/trachyte K-feldspar, plagioclase, feldspathoids Biotite, amphiboles ... Olivine Calcic plagioclase i i Amphibole ! Biotite Pyroxene Sodic plagioclase ~ Potassium . ~ feldspar...series starting with olivine and continuing to biotite is a discontinuous series, because each new mineral |
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