Gary Beaudoin; former Project Manager of Golden Tiger Corporation
February 9th, 2001
Bulk testing of the Toson Terrace placer gold deposit in the Zaamar Goldfield of Mongolia was carried out by Golden Tiger Corporation in 1996. The sampling methodology described in this technical paper is to calibrate the results of gold grade for loose material (LCM).
A pilot plant and an electric water pump rated to deliver l00m3/hour of water were used for the bulk testing. The slurry was produced by feeding the material into a 6m3 hopper protected by a 150mm grizzly, discharged onto an inclined belt and then fed into a 4m long trommel (incl.1m scrubber) by a feed chute equipped with water spray.
The trommel screened off oversize at >5mm. The <5mm was pumped to a MD7.5 Knelson concentrator where the feed slurry was 40% solids and had a maximum feed capacity of 20m3/hour. Concentrates were collected after each 100m3 batch sample.
The results indicate a gold grade of 320 mg/m3 ("in situ" BCM) for a 3m thick low-grade zone, and 415 mg/m3 ("in situ" BCM) for a 4m thick high-grade zone. The top 30cm of the underlying bedrock material yielded a gold grade of 317 mg/m3 ("in situ" BCM). The pilot plant processed 200m3 of sluice tailings and the Knelson recovered 29.02 grams of gold, indicating a grade of 145mg/m3 (loose material LCM). These tailings were from the high-grade zone, thus the sluice mining achieved only 51% gold recovery.
Special acknowledgement to World Placer Journal and Gary Beaudoin (former Project Manager of Golden Tiger Corporation.
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