Atlanta Gold Inc. announced positive metallurgical test results from 11 tons of bulk stock material previously washed by a sluice/jig plant located at the Knife River Corporation's facility in Boise, Idaho with the objective of obtaining 25 lbs of concentrate for refining evaluations and estimating costs. The initial bulk sample of 107 tons processed by Knife River in August 2012 recovered 20% of the gold values from an average feed of 0.051 ounces per ton (opt) Au. Reprocessing in June 2013 of 11 tons of the materials remaining from the initial bulk sample and grinding to -20 mesh liberated additional gold and heavy metals produced a concentrate of 18.896 opt Au which was verified by an independent mine laboratory.

Of the total gold, 66.6% was recovered from standard cyanidation. Using grind, roast and cyanidation, overall recovery rates increased to 88.9%. The objective for Final Recovery testing is to determine if the onsite gravity recovery system would produce a concentrate using only water as a medium.

This testing supports the hypothesis that gravity separation is a viable option. Bulk stock material was fed by hopper conveyor feeder to a ball mill and the outflow slurry delivered to a custom sluicing system with an 8 foot long spreading flume and into a 30 inch wide by 4 foot long sluice box containing low profile riffles. The sluice concentrates were collected after each 2,000 lb run.

The concentrates were taken back to the shop, screened through a 20-mesh screen and the -20 mesh was upgraded/cleaned on a 4x8 shaker table, producing 25 lbs of heavy concentrate obtained from processing 11 tons of the feed material. The +20 mesh, shaker table tails, -20 mesh sluice concentrate, head feed samples, sluice tailings and overflow slimes were saved, dried, sealed and sent for assay.