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<p>[QUOTE=&quot;acanthite, post: 736806, member: 6647&quot;]Placer gold:&nbsp; gold that has been liberated from where it initially crystallized and has been transported (usually by water) and concentrated elsewhere by purely physical means.</p><p>&nbsp;</p><p>Oxide gold: can be placer, but also any gold that exists in material that has been exposed to enough air that sulfides around it (possibly encapsulating it) have broken down, leaving the gold &#039;free&#039; and much cheaper to extract.</p><p>&nbsp;</p><p>Sulfide gold:&nbsp; Gold in its primary form, locked in some variable concentration of sulfide minerals.&nbsp; Can be relatively easy to extract, depending on the chemistry, or can be extremely difficult.</p><p>&nbsp;</p><p>Most large gold mines now must extract the gold locked up in the sulfide form.&nbsp; There just isn&#039;t a great deal of oxidized gold left, even less placer gold, by virtue of the fact that it has already been discovered and exploited.</p><p>&nbsp;</p><p>Having said that, there are many, many millions of oz of gold, in many parts of the world, that have not been extracted.&nbsp; The fact that they have not been is any combination of factors, such as degree of encapsulation and chemistry of sulfides (metallurgy), access, depth, proximity to water bodies and other logistical and environmental considerations, political stability of the host country, and climate factors.[/QUOTE]</p><p><br /></p>

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