... of 4.02 g/ton.The oxide deposit was expressed on the surface as a series of 3- to 15-m-deep ancient mine workings, which extended 800 m along the strike of the deposit, and sparse outcrops of silicified rock. Oxide ore occurs as two deposits: a surficial deposit consisting of ancient tailings and dump...

... and then milled ore. They only used a combination of spirals, jigs and shaking tables to gravitational separate the ore and to extract cassiterite (plus inclusions; cf . Fuchsloch et al., 2019 ). Other minerals/elements were not of interest in the past. Therefore, the tailings largely retained their primary...

... of the carbonatite complex ( Miller, 2008 ). This resulted into a complex rock suite with i.a. monzonite, syenite, urtite, foyaite, lamprophyre, tinguaite, ‘fenite’ and calcio-carbonatite, which lead to the formation of at least five economically mineable fluorite ore bodies ( Figure 1 ). Consequently, this broad...

... of South Africa and Council for Geoscience , Johannesburg/Pretoria , 325 - 380 . Craig , J.R. , 2001 . Ore-mineral textures and the tails they tell . Journal of the Mineralogical Association of Canada , 39 , 937 - 956 . De Kok , S.K. , 1972 . Differential flotation of copper-zinc...

... in existing ore bodies, allow tailing dumps to be considered as industrial waste deposits ( Ptitsyn, 2014 ). * Corresponding author. E-mail address : [email protected] (N.V. Yurkevich) 25 7 2016 20 2 2017 30 3 2017 © 2017, IGM, Siberian Branch of the RAS 2017 IGM...

...Ilya V. Vikentyev; Marina A. Yudovskaya; Andrey V. Mokhov; Alexey L. Kerzin; Anatoliy I. Tsepin Abstract The Uzelginsk deposit in the southern Urals, in Russia, is an example of a weakly altered classical massive sulfide deposit of the Uralian type. Pyritic Cu–Zn ore contains gold in two main modes...

... are epidote-rich retrograde skarn and limestone replaced by massive pyrite and chalcopyrite. Ores of the McLaren deposit consist chiefly of epidote-rich retrograde skarn, quartz-pyrite replacement bodies, and magnetite-rich replacement bodies. The Fisher Mountain deposit consists of quartz-pyrite-rich...

... were remediated to limit dust formation. P hoto by U.S. F orest S ervice (B) Historical tailings deposits at a mine in southern California, USA, are heavily traveled by motorcycles and other off-road vehicles, which results in substantial exposure of the vehicle operators to dusts with very high...

... of the mine entrances and shafts have now been filled with water and are inaccessible. Published reports describing the extent of ore bodies date to the late 1800s and early 1900s and are focused on mines toward the center of the study area near Port Henry and Moriah. The Cheever Mine was the first...

... to be from drainage of flooded mines, mining wastes and tailings abandoned in settling ponds, and exposed ores. The transport of the fine materials eroded from the tailings ponds contributes to spreading pollution over larger areas downstream. Concentrations of Pb, Cd and Zn in the streams draining...

...” (fig. 1 ). According to Sainfeld [1952] ore deposits appear as vein, substitution and impregnation-types bodies. Ore deposits in Tunisia are distributed around the salt-bearing Triassic outcrops with a NE-SW trend (fig. 1 ). According to Rouvier et al . [1985] , although mineralizations are linked...

... mine in California. Mountain Pass was for many years the world's main REE provider, and it is scheduled to resume operations in the near future. Compositionally bastnäsite contains ~75 wt% rare earth oxides (REOs) and in the above-mentioned confirmed ore bodies, concentrates have been prepared, after...

...) reverse fault. The mine exploited and processed As-, Sb-, and Cr-ores in the period between 1923 and 1979. Over one million tons of tailings containing As, Sb, and other hazardous substances are located in an open dump site for flotation waste created by the mine ( Fig. 2 a). The production...

... at the grain scale . The Canadian Mineralogist 43 , 1205 – 1224 . Walker, S.R., Jamieson, H.E., Lanzirotti, A., Hall, G.M., & Peterson, R.C. (2015) The effect of ore roasting on arsenic oxidation state and solid phase speciation in gold mine tailings...

..., Indonesia Table 2. Examples of High-Grade Ore Components Associated with Hypogene Porphyry Cu Deposits High-grade component Telescoped vein system Calcic exoskarn Size (Mt), grade (% Cu) 193, 4.26 375, 1.95 (+0.72 g/t Au) Calcic and magnesian exoskarn Carbonate-replacement bodies Magma carbonate-replacement...

... the underlying subsoil. Samples were collected at 1 m intervals and each sample weighed more than 2.5 kg. The density and moisture content of the tailings were measured by using ring sampler on site. ore beneficiation tailings geochemistry mineralogy sequential extraction Dexing copper mine 3D model...

... by abundant disturbances and penetrated by thin (<1 m) lenticular pegmatoid bodies of quartz–feldspar composition and by quartz veins up to 40 cm thick. The leuco-and melanocratic varieties are unevenly distributed throughout the deposit section: The lower sub-ore member is characterized by nearly equal...

...), Australia (Dubbo) and Mongolia (Khaldzan Burgei). The ore bodies occur in variable forms, such as cumulates, pegmatites and veins and grades are low (0.5-2%) compared to those of carbonatite deposits (see Figure 2 ) and contain complex and variable silicates (zircon, eudialyite, elpidite and gittinsite...

... followed the recent accident at Aznalcollar, Spain. On April 25, 1998, a tailings spill from the mine of Aznacollar, in the southern Iberian pyrite belt, released about 7 × 10 6 m 3 of sulfide sludge in a tributary of the Guadalquivir river ( Van Geen and Chase, 1998 ), which drains the Donana national...

..., Snezhnyi, Levaya Naminga, and Vostochnyi-11 sites). In total all ore bodies at the deposit form a series of ore bands or ribbons extending across the strike of the trough from northeast to southwest [ 4 , 5 ]. All orebodies are characterized by variability and wide occurrence of ore types, variable...