Gravel-filling of shrinkage cracks in gold refining residue and its impact on rehabilitation in southwest Australia. 2. Movement of surface incorporated Gypsum
Pratt, A.S., Bell, R.W., Samaraweera, M.K.S.A. and Ho, G.E. (2000) Gravel-filling of shrinkage cracks in gold refining residue and its impact on rehabilitation in southwest Australia. 2. Movement of surface incorporated Gypsum. In: International Conference on the Remediation and Management of Degraded Lands, 30 November - 2 December, Fremantle, Western Australia.
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Gold refining residue at the Boddington Gold Mine is alkaline (pH 9.5 - 10), saline (6.35 dS/m) and sodic (67 -72 % exchangeable sodium). Previous research has shown that amelioration of these adverse properties can be achieved by incorporating 30 - 60 t gypsum/ha into the residue (Ho et al. 1999). The vertical depth of amelioration, however, is often restricted to the layer into which gypsum is incorporated (surface 30 cm), leaving the underlying residue unamended. This may have a detrimental effect on the growth of deep-rooted plant species used in the revegetation of the residue storage area. The present study was conducted to determine the importance of shrinkage cracks in the residue on the movement of calcium (Ca2+), measured as exchangeable Ca2+ (XCa), down the profile and to evaluate the effectiveness of gravel-filling of these cracks on the depth of amelioration.
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|Murdoch Affiliation:||School of Environmental Science|
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