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Sedimentary exhalative deposits (SEDEX or SedEx deposits) are zinc-lead deposits originally interpreted to have been formed by discharge of metal-bearing basinal fluids onto the seafloor resulting in the precipitation of mainly stratiform ore, often with thin laminations of sulfide minerals.
Upon exposure to oxygen (O 2) and water (H 2 O), metal sulfides undergo oxidation to produce metal-rich acidic effluent. If the pH is low enough to overcome the natural buffering capacity of the surrounding rocks (‘calcium carbonate equivalent’ or ‘acid neutralising capacity’), the surrounding area may become acidic, as well as contaminated with high levels of heavy metals.
Metal mines may generate highly acidic discharges where the ore is a sulfide mineral or is associated with pyrite. In these cases the predominant metal ion may not be iron but rather zinc, copper, or nickel. The most commonly mined ore of copper, chalcopyrite, is itself a copper
The stoichiometric ratio of MS to H 2 S is 1:1, meaning for every sulfide ion present as a metal sulfide compound, one molecule of H 2 S is generated. Thus, the amount (in moles) of H 2 S measured by weighing the trap is equal to the amount of AVS originally present in the sediment. The metal (M) is transformed from solid form to the dissolved ...
Collecting drainage in the Iron Mountain Mine. The mine is located at in the Klamath Mountains of Shasta County, about 9 miles northwest of ReddingThe mine area is drained by several creeks which ultimately enter the Spring Creek Reservoir, formed by the Spring Creek Dam, and finally the Keswick Reservoir formed by a dam across the Sacramento River.
The best nickel deposits are formed where sulfide accumulates in the base of lava tubes or volcanic flows — especially komatiite lavas. Komatiitic nickel-copper sulfide deposits are considered to be formed by a mixture of sulfide segregation, immiscibility, and thermal erosion of sulfidic sediments.
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Some sulfide minerals are economically important as metal ores. The sulphide class also includes the selenides, the tellurides, the arsenides, the antimonides, the bismuthinides, the sulpharsenides and the sulphosalts. [1] [2] Sulphide minerals are inorganic compounds. Pyrite