"Franz Heymann" wrote in
:


That is incorrect. 95% of the gold mined in the world occurs as
native gold, or as gold-silver alloys (or simple mechanical mixtures.
I am not quite certain). The only gold ore of any significance id
Calaverite, which is gold telluride, which is mined in quantities
which are small compared to the native gold mined in South Africa.

The other minerals you quote do not contain any gold in their chemical
compositions.

Here's a site that agrees with us:
http://mineral.galleries.com/mineral.../gold/gold.htm

"There are very few true gold ores, besides native gold, because it forms a
major part of only a few rare minerals, it is found as little more than a
trace in a few others or it is alloyed to a small extent with other metals
such as silver. "

and

"A few of the tellurides are nagyagite, calaverite, sylvanite and
krennerite. These are all minor ores of gold but their contributions to the
supply of gold pales next to native gold's own contribution. "

-- Salty