Company: Not specified in provided text
Date: October 2016
Location: British Columbia, Canada
Executive Summary
The Bralorne Project is a gold operation located in British Columbia, Canada. Prior to the most recent shutdown in 2014, the Bralorne mill and concentrator utilized conventional grinding, gravity concentration, and froth flotation to produce both Dore bar and flotation concentrate for sale. Silver contributes only a very minor credit to the Dore. Subsequent to the 2014 shutdown, a Knelson Concentrator was installed to replace the duplex jig in the flowsheet as per recommendations from the 2012 PEA study.
The processing facility has undergone operational adjustments that have increased plant throughput from approximately 90 tons per day to 130-140 tons per day. These improvements incorporated an increased volume of ball loading, decreased ball mill feed particle size (from -1/2″ to -3/8″), and enhanced monitoring of cyclone operation and solids density in the mill. The increased throughput has resulted in a coarser product size (from 80% passing 200 mesh to as low as 50% passing 200 mesh), which has led to reported increases in flotation tailing losses and slightly lower gold recovery, but with overall higher precious metal production.
Processing Overview
The Bralorne mill employs a conventional crushing and grinding circuit followed by gravity concentration and flotation. The crushing circuit includes a jaw crusher and cone crusher configuration capable of operating at 50 tons per hour. The grinding circuit utilizes a ball mill operating at 72% critical speed with a 300% re-circulating load. Gravity concentration is achieved through a jig and shaking table, with a Knelson Concentrator added post-2014. The flotation circuit employs conventional reagents (PAX collector and Dow-froth 250 frother) with rougher, scavenger, and cleaner stages to produce a final concentrate that is thickened, filtered, and bagged for shipment.
Website: https://taliskerresources.com/projects/bralorne/history/
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