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Yellowhead Mining (TSXV:YMI) reported the findings of its recently completed comminution and flotation testwork to support engineering design for the feasibility study on its Harper Creek copper-gold-silver project, BC.
As quoted in the press release:
Metallurgical and comminution testwork on the Harper Creek deposit has resulted in a 4% improvement in anticipated copper recovery and comminution testwork has indicated a much coarser primary grind resulting in a 13% reduction in the grinding circuit power requirements. Both results represent an improvement on the assumptions used in the Preliminary Economic Assessment (“PEA”) filed on SEDAR on April 1, 2011.
The results are based on samples collected from four PQ (85mmØ) diamond drill holes located throughout the proposed pit limit targeting lithological types that will be mined in the first 10 years of the proposed project life. In all, six discrete lithologies were identified. A total of 6,670kg was sent to G&T Metallurgical Services Inc. (“G&T”) laboratory in Kamloops, BC for comminution and flotation testwork. A further 752kg sample was separately packaged and shipped to FLSmidth’s laboratory in Bethlehem, PA for comminution testwork only. For the flotation test work, G&T created a master composite based on the relative distribution of each of the lithologies throughout the proposed pit area. In all, three main lithological groups represent approximately 90% of the expected mill feed. In addition, ten composites representing individual lithologies and grades were created for variability testing.
Yellowhead Mining President and CEO, Ian Smith commented:
“We are extremely pleased with the very significant increase in Cu recovery which will be reflected in more robust project cash flow. The reduction in total comminution power requirements will have positive capital and operating cost impacts.”
Click here to read the Yellowhead Mining (TSXV:YMI) press release.
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