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Testing and modeling the influence of reclamation and control methods for reducing nonpoint mercury emissions associated with industrial open pit gold mines.

Journal of the Air & Waste Management Association (1995) (2013-07-19)
Matthieu B Miller, Mae S Gustin
ABSTRACT

Industrial gold mining is a significant source of mercury (Hg) emission to the atmosphere. To investigate ways to reduce these emissions, reclamation and dust and mercury control methods used at open pit gold mining operations in Nevada were studied in a laboratory setting. Using this information along with field data, and building off previous work, total annual Hg emissions were estimated for two active gold mines in northern Nevada. Results showed that capping mining waste materials with a low-Hg substrate can reduce Hg emissions from 50 to nearly 100%. The spraying of typical dust control solutions often results in higher Hg emissions, especially as materials dry after application. The concentrated application of a dithiocarbamate Hg control reagent appears to reduce Hg emissions, but further testing mimicking the actual distribution of this chemical within an active leach solution is needed to make a more definitive assessment.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Mercury, ≥99.99% trace metals basis
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Gold, wire, diam. 0.25 mm, ≥99.9% trace metals basis
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Gold, nanopowder, <100 nm particle size, 99.9% trace metals basis
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Gold, foil, thickness 0.127 mm, 99.99% trace metals basis
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Gold coated microscope slide, layer thickness 100 Å, 99.999% (Au)
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Gold, powder, <45 μm, 99.99% trace metals basis
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Gold, wire, diam. 0.5 mm, 99.99% trace metals basis
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Mercury, ACS reagent, 99.9995% trace metals basis
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Gold, foil, thickness 0.5 mm, 99.99% trace metals basis
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Gold coated microscope slide, layer thickness 1000 Å, 99.999% (Au)
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Gold, wire, diam. 0.1 mm, 99.99% trace metals basis
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Mercury, electronic grade, 99.9999% trace metals basis
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Gold, wire, diam. 0.5 mm, 99.999% trace metals basis
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Gold, foil, thickness 0.1 mm, 99.99% trace metals basis
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Gold, wire, diam. 1.0 mm, 99.99% trace metals basis
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Gold, powder, <10 μm, ≥99.9% trace metals basis
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Gold, evaporation slug, diam. × L 0.3 cm × 0.6 cm, 99.99% trace metals basis
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Gold, wire, diam. 1.0 mm, 99.997% trace metals basis
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Gold, foil, thickness 0.25 mm, ≥99.9% trace metals basis
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Gold, powder, <850 μm, ≥99.99% trace metals basis
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Gold, wire, diam. 0.25 mm, 99.99% trace metals basis
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Gold coated glass cover slip, 99.999% (Au), diam. × thickness 15 mm × 130-170 μm, layer thickness 100 Å
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