Characterization of acid mine drainage and baseline geochemistry of the Croydon mine environment, North Queensland, Australia

Edraki, Mansour, Anita, Parbhakar, Hardie, Kathleen, Hall, Tania and Kadletz, Oscar (2009). Characterization of acid mine drainage and baseline geochemistry of the Croydon mine environment, North Queensland, Australia. In: Securing The Future: Mining, Metals and the Environment in a Sustainable Society, and 8thICARD: International Conference on Acid Rock Drainage. Conference Proceedings. Securing The Future 2009: Mining, Metals and the Environment in a Sustainable Society, and 8thICARD: International Conference on Acid Rock Drainage, SkellefteƄ, Sweden, (1-12). 23-26 June 2009.

Author Edraki, Mansour
Anita, Parbhakar
Hardie, Kathleen
Hall, Tania
Kadletz, Oscar
Title of paper Characterization of acid mine drainage and baseline geochemistry of the Croydon mine environment, North Queensland, Australia
Conference name Securing The Future 2009: Mining, Metals and the Environment in a Sustainable Society, and 8thICARD: International Conference on Acid Rock Drainage
Conference location SkellefteƄ, Sweden
Conference dates 23-26 June 2009
Convener SveMin/INAP
Proceedings title Securing The Future: Mining, Metals and the Environment in a Sustainable Society, and 8thICARD: International Conference on Acid Rock Drainage. Conference Proceedings
Place of Publication Sweden
Publisher SveMin/INAP
Publication Year 2009
Sub-type Fully published paper
ISBN 9781615678167
1615678166
Start page 1
End page 12
Total pages 12
Collection year 2010
Language eng
Formatted Abstract/Summary
Recent mining activity between 1981-1990 at several mine site in Croydon, North Queensland ha left uncapped sulfidic waste rock dumps. At the federation mine, the waste rock is characterised by typical vughy quartz pyrite veins which are the source of acidity, metals and a range of minerals produced by oxidation and acid mine drainage processes. Acid mine drainage from the major dumps seeps into the adjacent Federation Pit which contained elevated levels of dissolved metals including zinc, arsenic, cadmium, lead, copper, aluminum and manganese and relatively low concentrations of sulfate. The catch dam built below Federation pit is also acidic. There is periodic discharge at high flow times. The results of ICP-MS scans on water and sediments show anomalous concentrations of Al, Mn, As, Cu, Zn, Cd and Pb in the creeks adjacent to the site relative to background levels. While concentrations reduce at various distances from the site Cd, Mn and Zn are relatively more mobile than As and Pb.There is a positive correlation between Cu, Zn, Cd and pH of surface waters with a considerable decrease in the concentrations of metals and arsenic at 12km downstream. The experience of pit water treatment shows that planning for and assessing the site rehabilitation should be based on a measure of metal loads and not concentration alone.
Subjects E1
960908 Mining Land and Water Management
040202 Inorganic Geochemistry
Keyword Abandoned mines
Water quality
Stream sediments
Trace metals
Rehabilitation
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 08 Apr 2010, 14:57:58 EST by Laurelle Elliott on behalf of Centre For Mined Land Rehabilitation