Development of a new water sampling device to measure biologically-available metals in natural waters and mine effluents

Abstract An in situ water sampling device has been developed to measure biologically-available or ÒlabileÓ metals in natural waters and effluents. The active mechanism involves the use of a polyacrylamide gel layer to quantitatively control metal transfer to a trace-metal-adsorbing, gel-imbedded resin. Because the resin only adsorbs free metal ions (the gel sampler methodology is a kinetic speciation technique), and because metal bioavailability is related to the free-ion activity, the device provides a direct measure of the biological-availability of metals in the environment sampled. The prototype consists of a layer of ion-permeable polyacrylamide gel which separates the solution to be sampled from an ion exchange resin. Because approximately 90% of the polyacrylamide gel is water, mass transport through the gel is diffusion-controlled, and is therefore well defined. Metal ions are rapidly bound by the resin, creating a steep concentration gradient in the gel. The amount of labile trace metal that accumulates on the resin can be related directly to the concentration of the metal in solution, the expos
Keywords: Trace metals, Water sampling devices, Mine effluents.
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Summary: With the globalization of the mining industry, many companies are now seeking to invest in underground diamond mines, with the purchase of small diamond pipes being seen as particularly attractive. However, recent experiences in South Africa have shown that many projects fail due to a lack of awareness of the hazards associated with diamond mining. In this paper three significant hazards are dealt with Ñ mud rushes, block crushing, and implementation of an inappropriate mining method....
Publication: CIM Bulletin
Author(s): R.J. Butcher
Keywords: Underground mining, Diamond mining, Diamondiferous pipes, Mining methods.
Issue: 1037
Volume: 93
Year: 2000
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Summary: In the 1970s, environmental concerns and associated liabilities were a new and unknown aspect of corporate risk. Today, social concerns and the associated conflicts that they can generate constitute a rapidly expanding aspect of risk. Although not a new phenomena Ñ the Bougainville copper mine was forced into closure in 1988 Ñ social risk has emerged as considerably more important, and increasingly visible, in the last few years. Social risk is now an aspect of all mining activities which...
Publication: CIM Bulletin
Author(s): S. Joyce, I. Thomson
Keywords: Public affairs, Resource development, Sustainable development, Latin America, Social concerns.
Issue: 1037
Volume: 93
Year: 2000
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Summary: Placer Dome is learning from experience in Latin America, Asia and Africa, as well as in North America, that contributing effectively to sustainable human progress in the areas of its operations presents unending challenges to think creatively, communicate effectively and remain culturally sensitive. People must be better off in terms of their economic circumstances, their social conditions and the quality of their natural environment not only during the life of the mines, but after mines...
Publication: CIM Bulletin
Author(s): J.P. Cooney
Keywords: Community relations, Public affairs, Sustained development, Environmental and Social Performance Indicators (ESPI), Mining and Environmental Research Network (MERN) Placer Dome Centre for Industrial Health.
Issue: 1037
Volume: 93
Year: 2000
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Summary: Black Hawk Mining Inc. has completed a comprehensive program on the prediction and management of acid rock drainage (ARD) at their Keystone Gold Mine (Keystone) near Lynn Lake, Manitoba. The program, initiated in 1994, followed a phased approach utilizing initial acid-base accounting (ABA) results and subsequent laboratory kinetic testwork to define site-specific sulphide oxidation and neutralization consumption rates in waste rock. Net acid generating waste rock at Keystone was defined...
Publication: CIM Bulletin
Author(s): D.H. Flather, B.C. K. Drover, J.W. Hendry
Keywords: Acid rock drainage, Keystone Gold Mine, Acid-base accounting.
Issue: 1037
Volume: 93
Year: 2000
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