But pyrite sometimes contains hidden gold within its crystal structure - it can hide as much as 2,000 parts per million gold (this would be equivalent to a ton of pyrite containing about 60 ounces of gold). The gold in the pyrite would not be visible; unless some the mineral had oxidized and was replaced by limonite (a hydrated iron-oxide that is essentially rust) producing what is known as gossan, or boxworks.
johnnysau
johnnysau
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