| | 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...expansion and coolingof the hydro(quartz, kaolin,montmorillonite, sericite),and prop- ylitic (chlorite, epidote...locations of E1 Teniente, Rio Blanco, and Los Bronces mines. Modified from Mapa Geo16gicade Chile, Instituto | | | Journal (article/letter/editorial) | Triassic age, ranging in com(epidote,calcite,montmorillonite). Of greaterim- positionfrom dioriteat the...effectscomby sericite, kaolinire, and minor montmorillonite prise an early stageof pervasiveargillic alteration...intense argillicalteration(sericite-kaolinite-montmorillonite) is dominant. Rb levels are stronglydepletedin...respectively, in altered andesitesassociatedwith the Braden porphyry copperdeposit. Althoughthe BethlehemJA..., 1971,Rubidiumas a guideto ore at E1 Teniente (Braden), Chile [abs.]: ECON.Gr.oI.., v. 66, p. 977. Brabec | | | 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 ¢ | | | Book | 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...to meet our needs rather than mine our own resources. Only if we mine U.S. copper will gold production...Oklo uranium mine, Republic of Gabon. This view not only shows a typical small open pit mine, but several | | | 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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