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Showing 1 to 7 of 7 for “"chrysocolla"”.
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INTEGRATED AND MULTI-SCALE CHARACTERISATION OF GEM MATERIALS LACKING LONG-RANGE ORDER. THE CASE STUDIES OF CHRYSOCOLLA AND ANDEAN BLUE OPAL
… material lacking a long-range structural order, chrysocolla and Andean blue opal. Chrysocolla is a hydrated copper silicate (Cu2-xAlx(H2-xSi2O5)(OH)4·nH4O), known for its vivid blue–green colour and its millennial use (Bianucci et al., 2009; Clark, 2021; Torpy et al., 2021). Its classification …
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A study of the flotation characteristics of a complex copper ore
… 1.0 % of the LQ ore. LQ ore was dominated by chrysocolla, which constituted 3.8 % of the ore. The treatment of HQ ore with 30 g/t SIBX has shown that up to 90 % of the copper can be recovered from HQ ore. On the other hand, while 30 g/t SIBX was sufficient for chalcopyrite recovery in LQ ore, …
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The stratigraphic and structural controls on copper-gold mineralization at Cassenha hill prospect, within the Archean to Paleoproterozoic Angolan shield, Congo craton, South Western Angola
… (stage II) consisting of malachite ± azurite ± chrysocolla, which represents the prevalent mineralization at the prospect. The δ 18O value of quartz veins range from +12.81 to +13.53‰, while the δD of chlorite minerals range from -51 to -45‰. Therefore, assuming fluid-rock interaction took place …
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Etude de la flottabilité de la malachite à l'aide de l'amylxanthate de potassium et d'un acide gras. (Cas d'étude: Flottation du minerai oxydé de Kamfundwa au Katanga en RDC)
… of the flotation tails reveals the presence of chrysocolla, a copper bearing mineral not easily recoverable under the experimental conditions used. The cost calculation regarding reagents consumption rate has enabled to validate a compromise between copper recovery and selectivity and has …
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Fremont Finery: Exchange and Distribution of Turquoise and Olivella Ornaments in the Parowan Valley and Beyond
… variscite, azurite, malachite, and possibly chrysocolla are also present. Also, various experimental methods were used to chemically characterize a turquoise artifact from Parowan Valley (see Appendix A). I analyzed over 350 Olivella artifacts (see Appendix B) and examined modern Olivella …
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Microbial carbon within and above exotic copper deposits in northern Chile : implications for ore genesis and exploration
… Two main sample suites were examined: chrysocolla-rich ores from the Huinquintipa and Mina Sur deposits; and soils overlying a paleochannel in the Huinquintipa area known to be mineralised. The samples were processed using four different analytical techniques to determine their 13C …
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Enhanced copper recovery from Chingola refractory ore
… copper found in malachite, pseudomalachite and chrysocolla. This ore was previously not processed due to the difficulty of recovering copper, which is structurally integrated in the mica lattice. Following a literature review, high-intensity magnetic separation, direct, staged flotation, and …