http://www.ars.usda.gov/is/pr/thelatest.htm
USDA Agrucultural Research News
First 3 paragraphs:
Miners might have been better off farming plants rather than digging pits
for high-grade ores.
U.S. Department of Agriculture agronomist Rufus L. Chaney and colleagues in
USDA's Agricultural Research Service, at the University of Maryland, and in
England have patented a way to use plants to "phyto-mine" nickel, cobalt and
other metals.
Phyto-mining, or biomining, is the use of plants to extract valuable
heavy-metal minerals from soils.
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