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2003
Anoxic limestone drains (ALDs) have been widely used in the passive treatment of acid mine drainage (AMD), but their effectiveness has often been less than anticipated. Iron hydroxide often precipitates around limestone particles and inhibits neutralisation. To determine the conditions under...
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An environmental study of the Athabasca tar sands: Report and recommendations to Alberta Department of the Environment
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Intercontinental Engineering of Alberta Ltd.
The following was the general concept of the work for which the Study was commissioned: • Identify the various methods that could be used for oil extraction and their comparative merits with respect to minimum adverse effects on the environment. • In considering the Clark method of tar sands...
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2003
McCloskey, L., Wilmoth, R., LeFever, J., Jordan, D.
Exposed, open pit mine highwalls contribute significantly to the production of acid mine drainage (AMD) thus causing environmental concerns upon closure of an operating mine. Four innovative technologies were evaluated under the US Environmental Protection Agency’s, Mine Waste Technology (MWTP),...
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2003
Ayres, B., Silveira, C., Ellice, C., Christensen, D., O’Kane, M.
Peak Gold Mines (PGM), a member of the Rio Tinto Group, is an underground and open cut gold mining operation located near Cobar, NSW. A multi-phase study was initiated in 2001 in support of developing a dry ‘moisture store and release’ cover system design for the PGM tailings dam, which contains...
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2003
Madison, J. P., Gammons, C. H., Poulson, S. R., Jonas, J. P.
Spatial and temporal trends in water chemistry in the acidic (pH ~2.6) Berkeley Pit lake, Butte, Montana, can be explained by a newly developed iron-cycling model. Key elements of this model include: 1. subaqueous oxidation of pyrite and other metal sulfide minerals by dissolved ferric iron,...
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2003
Castendyk, D., Mauk, J. L., Brodie, K., Simpson, M.
Subaqueous water-rock reactions that occur at the pit wall/lake water interface can affect the pH of pit lakes. Many pit lake water chemistry models neglect subaqueous reactions, which may create inaccurate predictions over time. A mineral quantification method is presented that defines the wall...
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2003
Haley, K. J., DeVos, D. F., Verburg, R. L., Johnstone, R.
DeBeers Canada Mining Inc (DeBeers) recently submitted an Environmental Assessment (EA) for its proposed Snap Lake Diamond Mine located in Northwest Territories, Canada. As part of the EA process, a site water quality management plan must be developed. Plan development requires an integrated...
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2003
Weber, P., Stewart, W., Skinner, W., Smart, R., Thomas, J.
The acid neutralisation capacity (ANC) of rock sample containing significant iron carbonates and/or reactive framboidal pyrite can be a difficult parameter to determine. Results indicated that negative ANC results can occur if reactive sulfide minerals are present; and an over-estimation of ANC...
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2003
van Tonder, G., Vermeulen, D., Cogho, V., Kleynhans, J.
A number of rehabilitated open cast coalmines in SA are already decanting. The paper focuses on the situation at one of these mines where the following information exist: monthly decant rates and rainfall; sulfate concentrations of the decanting water; water level measurements inside the mine...