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Downes P.J.,Western Australian Museum | Demeny A.,Hungarian Academy of Sciences | Czuppon G.,Hungarian Academy of Sciences | Jaques A.L.,Australian National University | And 7 more authors.
Mineralium Deposita | Year: 2014

The Neoproterozoic Cummins Range Carbonatite Complex (CRCC) is situated in the southern Halls Creek Orogen adjacent to the Kimberley Craton in northern Western Australia. The CRCC is a composite, subvertical to vertical stock ∼2 km across with a rim of phlogopite–diopside clinopyroxenite surrounding a plug of calcite carbonatite and dolomite carbonatite dykes and veins that contain variable proportions of apatite–phlogopite–magnetite ± pyrochlore ± metasomatic Na–Ca amphiboles ± zircon. Early high-Sr calcite carbonatites (4,800–6,060 ppm Sr; La/YbCN= 31.6–41.5; δ13C = −4.2 to −4.0 ‰) possibly were derived from a carbonated silicate parental magma by fractional crystallization. Associated high-Sr dolomite carbonatites (4,090–6,310 ppm Sr; La/YbCN= 96.5–352) and a late-stage, narrow, high rare earth element (REE) dolomite carbonatite dyke (La/YbCN= 2756) define a shift in the C–O stable isotope data (δ18O = 7.5 to 12.6 ‰; δ13C = −4.2 to −2.2 ‰) from the primary carbonatite field that may have been produced by Rayleigh fractionation with magma crystallization and cooling or through crustal contamination via fluid infiltration. Past exploration has focussed primarily on the secondary monazite-(Ce)-rich REE and U mineralization in the oxidized zone overlying the carbonatite. However, high-grade primary hydrothermal REE mineralization also occurs in narrow (<1 m wide) shear-zone hosted lenses of apatite–monazite-(Ce) and foliated monazite-(Ce)–talc rocks (≤∼25.8 wt% total rare earth oxide (TREO); La/YbCN= 30,085), as well as in high-REE dolomite carbonatite dykes (3.43 wt% TREO), where calcite, parisite-(Ce) and synchysite-(Ce) replace monazite-(Ce) after apatite. Primary magmatic carbonatites were widely hydrothermally dolomitized to produce low-Sr dolomite carbonatite (38.5–282 ppm Sr; La/YbCN= 38.4–158.4; δ18O = 20.8 to 21.9 ‰; δ13C = −4.3 to −3.6 ‰) that contains weak REE mineralization in replacement textures, veins and coating vugs. The relatively high δD values (−54 to −34 ‰) of H2O derived from carbonatites from the CRCC indicate that the fluids associated with carbonate formation contained a significant amount of crustal component in accordance with the elevated δ13C values (∼−4 ‰). The high δD and δ13C signature of the carbonatites may have been produced by CO2–H2O metasomatism of the mantle source during Paleoproterozoic subduction beneath the eastern margin of the Kimberley Craton. © 2014, Springer-Verlag Berlin Heidelberg.

Tiwari O.N.,Copper Project | Pradhan M.,National Institute of Technology Raipur | Nandy T.,Indian National Environmental Engineering Research Institute
Desalination and Water Treatment | Year: 2016

The chemical precipitation technique has been successfully utilized to treat the mine water. The copper concentration in mine water was below 50 mg per liter in majority of samples collected for the study. Iron concentration varied between 0.02 and 4.55 mg per liter. It was 0.674–3.83 mg per liter for manganese and fluoride concentration of 0.18–6.6 mg per liter was found. The pH range of mine water was 4.1 and 7.4. The study investigated the effect of pH adjustment and lime dosage on the mine water. Sample after treatment were analyzed for pH, chemical oxygen demand (COD), suspended solids (SS), total dissolved solids (TDS), and copper and fluoride ion concentration. The copper concentration reduction was found to be >99% over a treatment pH range of 8.0–9.5 using lime dosage of 140–170 mg/L at 56% purity of lime but the fluoride removal efficiency was approximately 40% at a treatment pH of 9.0. Thus, the study indicates the requirement of elevated pH (10.5) for better fluoride removal efficiency of 70%. It was also observed that lime with higher purity is better in terms of copper and fluoride removal effectiveness. Finally, the treated water pH (after settlement of sludge) was in the range recommended for discharge in inland surface waters bodies. © 2016 Balaban Desalination Publications. All rights reserved.

Samareh H.,Islamic Azad University at Tehran | Khoshrou S.H.,Amirkabir University of Technology | Shahriar K.,Amirkabir University of Technology | Saberi M.M.,Copper Project
Arabian Journal of Geosciences | Year: 2015

Ground vibration around mining areas is one of the undesirable phenomena of production blasts. To predict vibration magnitude due to production blasts in Sarcheshmeh Copper Mine, the seismic wave characteristics are recorded in two parts of south-east and south-west mine by seismometers. The blasts of each part are grouped by cluster analysis, and using multivariate analysis for each of the groups, models were defined to predict peak particle velocity (PPV). For model validation, first PPV values of some recorded experimental blast in the mine was predicated and the root mean squared error (RMSE) and mean absolute error were calculated for the cases of after- and before-grouped seismic data. In the south-west region of the mine, the RMSE is calculated after and before clustering the data 8.9 and 11.95, respectively. These values are shown; the created models after clustering in comparison with before clustering could decrease the rate of error up to 3. This rate of error and the value of mean absolute error are shown; the performance of created models is improved after the cluster analysis predicated the PPV. But in the south-east region of the mine, the value of RMSE by means of created models after clustering the data is increased in comparison with before clustering up to 0.22. This shows that the performance of models after clustering is decreased. © 2015 Saudi Society for Geosciences

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