Dear Friends;
Some friends brought the clay sample to search the gold presences. The yellow clay is very impure like a soap. No visible gold in the sample.... İ prepared 250 ml of full strength aqua regia (AR) for 20 gram of clay. All sample easily disolved in AR without clogging. And Stannous chloride test appeared very dense purple color. No brown fume observed in AR reaction stage. Can some kind of clay be leached via ferro/ferric cyanide or saline /hypoclorite vat leaching method. İf yes, Could someone please advise the begining reagent recipe and their ideal reaction conditions. İ think that gold grade of clay sample is about 0.8 %. İ virtually concluded this outcome from color comparisons of stannous chloride tests beetwen standart Au test solution and clay sample.
Best regards
ErdemView attachment 1View attachment 2
Some friends brought the clay sample to search the gold presences. The yellow clay is very impure like a soap. No visible gold in the sample.... İ prepared 250 ml of full strength aqua regia (AR) for 20 gram of clay. All sample easily disolved in AR without clogging. And Stannous chloride test appeared very dense purple color. No brown fume observed in AR reaction stage. Can some kind of clay be leached via ferro/ferric cyanide or saline /hypoclorite vat leaching method. İf yes, Could someone please advise the begining reagent recipe and their ideal reaction conditions. İ think that gold grade of clay sample is about 0.8 %. İ virtually concluded this outcome from color comparisons of stannous chloride tests beetwen standart Au test solution and clay sample.
Best regards
ErdemView attachment 1View attachment 2