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hi every one please need help on recovery of gold from ore Iam using agua regia on gold ore that Ifound as a grounded powder Its from a very old place .and Ifound refining clay and the gold ore .iam using aqua regia on it and precipate gold with smb as aorange light brown powder.clean it with amounia then water but cant melt even at or over1200c turn black slag .Idid it again to make sure i roested the ore and wash it with nitric clean it dryed and used aqua regia on again get same precipate orange light brown powder wont melt either .and i rosted one more time used chlorination on it precipate with smb again same powder clean it with amounia water same result wont melt please help with any idea .whene I aply the powder on aluminium it make it a gold colour .whane i used nitric wash i know it desolve most of the metals exept gold any idea please thanks