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Preliminary in-country metallurgical test work
Preliminary in-country metallurgical test work.
About this update from Goldstone Resources Limited
[{"type":"text","content":"\n \nRNS Number : 8930Y Goldstone Resources Ltd 11 December 2017 \n\n11 December 2017\n \nGOLDSTONE RESOURCES LIMITED\n(\"GoldStone\" or the \"Company\")\n \n \nPRELIMINARY IN-COUNTRY METALLURGICAL TEST WORK\n \nGoldStone Resources Limited (AIM: GRL) is pleased to announce the results of preliminary metallurgical test work on the AK01 proposed North and South pits on the Akrokerri licence, which have returned encouraging results and indicate the potential for heap leach processing of the oxide mineralisation. The Company is conducting preliminary metallurgical test work on samples obtained from the recent trenching to establish a range of potential processes for the development of the project.\n \nHighlights\n• Column tests show the AK01 oxide zone is extremely amenable to both the heap leach and to the CIL gold recovery processes\n• Gravity recovered gold of 14.8% and 25.4% in the North and South Pit samples respectively\n• Gold extraction from the tailings produced by the gravity tests were 90.2% and 93.5% for the North and South pit samples respectively using bottle roll test work with carbon1 \n• Column leach testing indicates moderate cement requirements, with 8 kg/tonne (\"kg/t\") addition rate enhancing the leaching efficiency and yielding acceptable column slump levels2\n• Column leach testing over a 30 day period resulted in recoveries of some 82.6% and 84.7% for the North and South pit samples respectively with cement addition of 8 kg/t\nNotes:\n1. Samples pulverised to all passing 75 microns prior to leaching by sodium-cyanide solution both with and without carbon in bottle roll tests over 24 hour periods.\n2. 4.5% & 3.3% column height slump in the North and South pit sample columns respectively utilising 8 kg/t binder material addition.\n \nPreliminary Metallurgical Test Work on the AK01 North and South Pits for Oxide Heap Leaching\n \nPreliminary metallurgical test work to assess the amenability of the oxide mineralisation to processing by heap leaching has been com...