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- W2059098737 abstract "Abstract Mine waste rock piles pose an environmental hazard which is difficult to assess without an appropriate sampling procedure. A sampling strategy was devised for four waste rock piles representing different types of mineral deposits in the Hillsboro mining district in Sierra County, New Mexico to characterize their geochemistry. The sites consisted of a placer gold waste rock pile (Site A), a Laramide polymetallic vein waste rock pile (Site B), a carbonate-hosted Pb–Zn waste rock pile (Site C), and a carbonate-hosted Ag–Mn waste rock pile (Site D). In addition, another Laramide polymetallic vein waste rock pile (Site E) was studied to compare physical and chemical characteristics with Site B. The waste rock piles have highly variable grain sizes. Chemical analyses of six size fractions indicated that the less than 0.25 mm size fraction typically contained the highest Cu, Pb, Zn and As concentrations. The four waste rock piles were sampled using grids with dimensions specific to the size and shape of each site. Each of the waste rock piles was sampled, using a 0.25 mm stainless-steel sieve, with sample densities of 15, 30 and 45 for each of the respective grids. The data revealed that sampling 45 samples per grid area produced metal concentrations similar to those for 15 and 30 samples. Therefore, the most economic sampling strategy to adequately characterize the waste rock piles, is a homogeneous composite of 15 to 30 samples." @default.
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- W2059098737 date "1999-12-01" @default.
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- W2059098737 title "Waste rock pile characterization, heterogeneity, and geochemical anomalies in the Hillsboro Mining District, Sierra County, New Mexico" @default.
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- W2059098737 doi "https://doi.org/10.1016/s0375-6742(99)00068-0" @default.
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