North Bay Resources, Inc. (the “Company” or “North Bay”) (OTC: NBRI) is pleased to announce a test shipment of 327 lbs. of gold concentrate grading 14.2 ounces per ton has been made from the Bishop Gold Mill to Just Refiners, Reno, NV. The shipment was the result of ongoing optimization of the Mill in February processing ore from its Fran Gold Property. Recent ore runs produced an estimated 2.44 troy ounces of contained gold from approximately 10 tons of ore. This reflects a recovered gold grade of 0.24 ounces per ton. An additional 0.1 ounce of contained gold in low-grade concentrate remained at the Mill. Recovery is currently estimated at approximately 50% overall or 70% of gravity recoverable gold. Metallurgical testing has shown gravity recovery of up to 67% may be achieved with an additional 30% recoverable by flotation. Head grade is estimated at 0.5 ounces per ton but varies considerably at the centrifuge due to gold charging of the ball mill and overflow container due to the inherent density of gold. The gravity circuit is now efficiently processing material and optimization of the jaw crusher, ball mill, centrifuge, and shaker table are now largely complete. The Company is now implementing the flotation circuit and increasing gravity circuit throughput.
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