Vancouver, BC, June 27th, 2013 ? Magellan Minerals Ltd. (TSX-V: MNM, OTCQX: MAGNF) (?Magellan?) is pleased to report that metallurgical results from the first phase of testing for the Feasibility Study on the Coringa Project have been received.
? 96.7% - 99.0% overall gold recoveries from samples ground to a P80 of 75 microns using a combination of initial gravity separation followed by carbon-in-leach cyanidation for 48 hours
? 92.3% - 96.7% gold recoveries from sulphide samples at the relatively coarse grind of P80 of 150 microns, after cyanidation for 48 hours
? Recoveries of 51.1% to 65.2% via gravity methods at a grind a P80 of 150 microns. Previously reported recoveries via gravity testwork indicated recoveries in the range of 40-50% at P80 of 150 microns
Whole ore carbon in leach gold recoveries of greater than 95% after 24 hours of leaching were achieved from two composite samples; the first sample representing 243.64kg of sulphide ore from the Galena, Mae de Leite and Serra zones, and the second representing 280.74kg of sulphide ore from the Meio and Come Quieto zones. These results are as good or better than the previous results obtained after 48 hours of leaching. In addition, gold recovery by gravity concentration resulted in recoveries greater than 50%. Additional testing is on-going now to optimize the flowsheet. The test results are an important step in advancing the design of the processing plant.
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| Grind size (P80 microns) | ||
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| 150 | 106 | 75 | |
| Gravity recovery (7L/m fluidization) |
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| Composite 1 |
| 65.2% | 63.6% | 62.6% |
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| Composite 2 |
| 51.1% | 47.5% | 47.4% |
| Leach recovery (after 48 hours with activated carbon) |
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| Composite 1 |
| 96.7% | 98.0% | 99.0% |
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| Composite 2 |
| 92.3% | 94.8% | 96.7% |
