How Can gold be extracted from pyrite 

How Can gold be extracted from pyrite,Pyrite as an Ore of Gold
The most important use of pyrite is as an ore of gold. Gold and pyrite form under similar conditions and occur together in the same rocks. In some deposits small amounts of gold occur as inclusions and substitutions within pyrite.
Some pyrites can contain 0.25% gold by weight or more. Although this is a tiny fraction of the ore, the value of gold is so high that the pyrite might be a worthwhile mining target. If pyrite contains 0.25% . It depends upon how efficiently the gold can be recovered and the cost of the recovery process.