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MEI Online: Environmental Issues: Latest News: September 6th 2004


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:: Economically Attractive and Environmentally Friendly Detox Process (The ROLB Process)

Riddarhyttan Resources AB has developed a new process to remove WAD cyanide and thiocyanates from cyanide leach tailings. The process was developed by Riddarhyttan personnel at the SGS Oretest Laboratory in Perth, Western Australia.

The test work involved extensive batch test work followed by a continuous pilot plant test. In the pilot plant the WAD cyanide concentration was reduced from 1 000 mg/l to less than 0.25 mg/l and the thiocyanate concentration from 6 000 mg/l to less than 50 mg/l.

The ROLB process is simple to operate and significantly cheaper than alternate technologies, it is estimated that the cost of detoxing the cyanide leach tailing at Suurikuusikko will fall from USD 3-4 per tonne of ore to USD 0.5-0.6 per tonne of ore. This decrease in cost is included in the appraisal made by Riddarhyttan in the latest annual report.

A patent application for the ROLB process was lodged in April this year and to date no objections have been received. A number of mining companies have expressed interest in obtaining a license to use the ROLB process.




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