NDLI: Acid mine drainage investigations at the Reddale Coal Mine, Reefton, New Zealand

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Acid mine drainage investigations at the Reddale Coal Mine, Reefton, New Zealand

Content Provider	Semantic Scholar
Author	Weber, Paul A. Thomas, David G. Pope, Jacqueline C.
Copyright Year	2013
Abstract	The Reddale Coal Mine, near Reefton, commenced operations in early 2012. Acid-base accounting techniques applied to drillcore combined with assumptions carried forward from mining similar lithologies in other areas (where acid neutralisation capacity (ANC) is assumed to be 0 kg H2SO4/t equivalent) resulted in what proved to be an overly conservative waste rock management strategy that assumed the site would produce acid mine drainage (AMD) immediately. This has not occurred. The lack of ANC data meant that, prior to mining, the time lag to acid onset derived from ANC was not identified. After 12 months of operation the drainage waters remain near neutral and, as a result, the water treatment plant has yet to be used, even after the removal of 494,000 tonnes of BCM overburden. 15mm (19kg CaCO3/m 2 ) of aglime (AP < 2.5mm CaCO3) was applied to each 4m lift of the Ferndale engineered landform (ELF) such that the overall NAPP of the overburden within the ELF was 19.4 kg H2SO4/t. This indicates that the site may eventually produce AMD, in the absence of neutralising materials. Subsequent, geotechnical assessment of the ELF demonstrated that the permeability of the dump on the uncompacted tipheads was 1 x 10
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.okc-sk.com/wp-content/uploads/2015/04/Weber-et-al-2013-Acid-mine-drainage-investigations-at-the-Reddale-Coal-Mine.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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