North Bay Resources Inc (NBRI)

[ironhammer]

good question this was in the last March 4 NR The Company reports the following Mill optimization progress:
• Centrifuge grade has been optimized from initial results of 0.5 ounce per ton to 19 ounces per ton, with a weighted average of 13 ounces per ton.
• Double pass centrifuge grade of 45 ounces per ton has been achieved.
• Optimization of gravity circuit has been successful with targeted results achieved in grind.
size and classification involving residence time in the ball mill, water flow, and residence time in the centrifuge. Final optimization of the gravity circuit is expected to increase overall recovery by up to 17%.
• The flotation circuit is currently being brought on-line to target very fine gold (-200 mesh) and gold in quartz not otherwise recovered by centrifuge or scavenger recovery at the shaker table. Implementation of flotation is expected to increase overall recovery by up to
30%.