The article notes that “skeptics in the industry will be watching the metallurgical results very closely.” Should this be the case, it is appropriate to acknowledge the work carried out by Caribou’s staff, Peter Brown, P. Eng. (Met Engineers), and Kamloops Research & Assay Laboratories in the selection of the flowsheet. Plant results are currently close to, and occasionally exceeding, projected metallurgical targets at planned throughput rates. It is anticipated that concentrate grades and metal recoveries will continue to improve as metallurgical optimization work progresses.
“The early indications are that we will not need to use balls in the grinding mill.” This quotation, together with the statement that “this, combined with the absence of a crusher should contribute to a low consumption of energy” requires clarification for your readers.
Run-of-mine ore, which passes through a 20-inch (508-mm) grizzly, is delivered by an apron feeder into a 22X7-ft mill. This mill is operating autogenously; that is, without grinding steel. The grinding circuit also includes a 13 1/2×22-ft ball mill, to which grinding balls are added.
It is hoped that the publication of this letter will be of interest to your readers and give due credit to those associated with the development of the Caribou mill. L. P. Taggart, P. Eng., Executive Vice-president, Proton Systems.
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