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<p>[QUOTE=&quot;Conder101, post: 1431208, member: 66&quot;]Gold and silver are made in the explosions of supernova and widely scattered.&nbsp; The geologic processes and the crustal melting is how this gold and silver gets concentrated into ore bodies by the repeated melting and slow cooling of the rock.&nbsp; (As the rock slowly cools it allows materials to separate by density and melting point.)&nbsp; This results in &quot;rich&quot; ore bodies where the metal can be measured as a few oz per ton.&nbsp; In the asteroids this geologic concentrating has not occurred.&nbsp; So while the gold may be there, and an asteroid may have a million oz of gold in it, it may be at the rate of a few milligrams per ton of rock.&nbsp; Frankly mining for water and or Iron/nickel would be more profitable.&nbsp; And not for return to the earth but for supplying orbital stations or possibly lunar colonies.&nbsp; Hauling water or iron and nickel up for the earth is prohibitively expensive, but mining asteroids and shipping it to orbiting colonies or DOWN to lunar ones might be more economical than earth supply[/QUOTE]</p><p><br /></p>

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