African Eagle Resources confident after test work on Dutwa ore
01 December 2009
African Eagle Resources has revealed the results of independent test work on ore from its Dutwa nickel project in Tanzania.
The results include the first tank leach and column leach test data, together with further "bottle roll" leach test results and rock property test results.
The Initial column test results showed rapid leach kinetics. After only 16 days, 60% to 70% of the nickel had been extracted, with low net acid consumption of 200 to 230kg/t. This shows extremely fast leaching reaction kinetics, much faster than most published nickel laterite data.
Elsewhere, three tank leach tests were conducted to investigate the ore behaviour under high temperature agitated vat leach conditions. The tests were conducted over 24 hours, but again, very fast reaction kinetics was seen and almost all of the nickel extraction occurred within the first hour.
African Eagle's managing director, Mark Parker, explained: “These results are extremely encouraging, showing very fast reaction kinetics and confirming the good nickel extraction and low acid consumption of the Dutwa ores.”
Parker said the results show that the project is amenable to both heap leach and tank leach, and point the way to further tests to determine the optimum process parameters.
“The fast leaching reaction, low acid consumption and good nickel extraction are extremely positive indicators for the viability and profitability of the project,” he said.
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