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Update - Macalder metallurgical testwork
Update - Macalder metallurgical testwork.
About this update from Red Rock Resources Plc
[{"type":"text","content":"\n \nRNS Number : 1634I Red Rock Resources plc 09 June 2011 \n \n\nRED ROCK RESOURCES PLC\nUpdate - Macalder metallurgical testwork\nDated: 9 June 2011\n \nRed Rock Resources plc (\"Red Rock\" or the \"Company\"), the gold mining and exploration company with projects in Kenya, and Colombia, and interests in steel feed, uranium, and rare earths reports on results of the Phase 2 metallurgical testwork at the Macalder tailings project in Kenya.\n \nMacalder tailings\n \nThe Macalder tailings deposit is at the previously operated Macalder VMS base metal mine situated in South Nyanza District in the South West of Kenya, close to the shores of Lake Victoria.\n \nThe Macalder Mine processed a VMS base metal deposit for the recovery of the copper mineralisation which was concentrated by flotation and roasted to a calcine for dissolution of the copper values which were subsequently precipitated onto scrap iron. Calcine tailing was then cyanide leached for the recovery of the gold and silver values. The cement copper was transported to the Kilembe Mines Smelter situated in Jinja, Uganda.\n \nThe gossan material from the upper levels of the VMS deposit was mined and processed for the recovery of the gold and silver values by a combination of amalgamation and cyanide leaching.\n \nThe tailing from the flotation, the calcines from the roast-leach circuit, and the gossan tailing are available on site for further processing.\n \nOn 19 August 2010 the Company announced an Indicated Mineral Resource in the tailings of 1.424m tons at a grade of 1.64 grams per ton of Gold.\n \nMetallurgical Testwork\n \nPhase 1 testwork was carried out to delineate the flowsheet. The testwork based upon variability samples from throughout the tailing resource indicated that a conventional cyanide leach plant would be required. Preconcentration of the tailing was shown to be non-viable.\n \nPhase 1 testwork was carried out on thirteen \"composite\" samples of the various types of tailing, identified visually, which were despatched to Amdel Laboratories in Western Australia. Amdel's scope of work was to determine the basic characteristics of the samples in conjunction with a preliminary metallurgical assessment with respect to the recovery of the value metal contents. The results indicated that a direct cyanide...