Business
Rockhaven Reports Excellent Pre-Concentration Results for the Klaza Deposit, Yukon
Bulk sample test work ~doubles potential grade by rejecting >50% of the initial feed VANCO...
About this update from Rockhaven Resources Ltd.
[{"type":"text","content":"Rockhaven Reports Excellent Pre-Concentration Results for the Klaza Deposit, YukonBulk sample test work ~doubles potential grade by rejecting >50% of the initial feedVANCOUVER, BC / ACCESSWIRE / September 12, 2023 / Rockhaven Resources Ltd. (TSXV:RK) (\"Rockhaven\") is pleased to announce encouraging results from comprehensive pre-concentration (sorting) test work on bulk samples of material selected from within the mineral resources at its 100% owned Klaza Au-Ag-Pb-Zn deposit, Yukon1. The test work results demonstrate the potential effectiveness of pre-concentration of Klaza mineralisation at a coarse crush size, by doubling the grade of material entering the mill and reducing the mill feed tonnage by over 50%, with only minor losses in metal. Positive impacts on potential future operations that may result from the use of pre-concentration include a material reduction in the amount of flotation tails, a significantly smaller grinding and flotation circuit and, potentially, lower overall capital and operating costs for such an operation. Once trade-off studies are completed, the revised flow sheet and cost estimates that result from the use of pre-concentration may also be employed to help in the determination of cut-off grades for the pending updated mineral resource estimation, as well as for the economics of the upcoming pre-feasibility study.HighlightsCrushing to a top size of 63mm, pre-concentration has been conducted on bulk samples with grades representative of the Klaza and BRX mineral resources.The pre-concentration:rejected greater than half of the initial feed material, while maintaining average recoveries of 93% for Au, 94% for Ag, 96% for Pb and 92% for Zn.led to an approximate doubling of the grade of the potential feed to a mill for all metals of economic interest (Au, Ag, Pb and Zn).It is expected that the adoption of pre-concentration could lead to significantly smaller grinding and flotation circuits, with lower overall capital and operating costs.Positive environmental impacts could be expected to result from the adoption of pre-concentration due to the significant reduction in the amount of flotation tails.Incorporating pre-concentration into a process circuit could potentially lower the cut-off grades for future mineral resource estimates.Testing of a composite of material below the assumed cut-off grade ...