Resolving the 'invisible' gold puzzle

In Carlin-type gold deposits, which make up 75% of the US production, gold does not occur in the form of nuggets or veins, but is hidden -- together with arsenic -- in pyrite, also known as 'fool's gold.' A team of scientists has now shown for the first time that the concentration of gold directly depends on the content of arsenic in the pyrite.

from Top Technology News -- ScienceDaily http://bit.ly/2J7K6BP