Is it possible for natural gold nuggets to be .999 pure? I have seen ebay listings for some but dont believe them.
I reckon its a very poor listing. -No weight stated or scales shown. -Unrealistic claim about purity. The plastic case would be worth more than the gold in my opinion.
Can someone clarify re XRF machine, i was told the machine only scan up to 0.2mm from the surface. So in the case of nuggets, it won't work?
Purest found so far is 99.91 with the rest being silver, found around Boulder. Been thinking about doing some prospecting so stumbled across the info while doing research.Native gold occurs in several different forms, to which popular names descriptive of their appearance have been given, such as crystalline, dendritic, rough, flake, mustard, and sponge gold. Tellurides of gold abound at Kalgoorlie and Mulgabbie. Calverite is the most frequently occurring mineral, but petzite, goldschmidtite, and the minerals termed kalgoorite and coolgardite are also found. Of the metallic minerals, iron in the form of iron pyrites and oxides is widely distributed. Galena comes next, whilst amongst other minerals found in association with the precious metal may be mentioned zinc blende, arsenopyrite, vanadinite, bismuth pyrrhotite, chalcopyrite,' bourononite, copper, scheelite. Quartz is of course the commonest of the earthy secondary minerals, but calcite, chalcedony, gypsum, actinolite, chlorite, and others are also found in association with gold. Some of the native gold is found to be remarkably pure, specimens of sponge gold from lodes at Boulder, Kalgoorlie, and East Coolgardie being found to contain 99.91 per cent, of the precious metal with but 0.09 per cent. of silver.
