Global Gold Rush en Organic gold mining? Meet 'Green Gold' <p>TADO, Colombia &mdash; Can rain forest plants replace toxic chemicals in the production of gold? The answer is a qualified &ldquo;yes.&rdquo; Instead of using mercury to separate the precious metal from tailings, a small group of miners who pan for gold in northern Colombia work with a natural extract made from the leaves of balsa trees.</p> <p><a href="" target="_blank">read more</a></p> Global Gold Rush Green Innovation Colombia Thu, 06 Dec 2012 11:00:00 +0000 John Otis 5728154 at