Test on Different Occurrence States of Gold in Pyrite and Its Significance—An Example of Pyrite From Gold Mines in the Jiaolai Basin

To reveal the relationships between different occurrence states of gold-bearing minerals in pyrite and mineralization,we present the separation and test methods of crystal lattice gold,native gold and quartz inclusion gold in pyrite.Then we have made tests on three occurrence states of gold in the main mineralization stage of pyrite from typical gold deposits in the Jiaolai basin.The result shows that native gold dominates in this pyrite and varies little in content proportion,which implies the same ore-forming fluid and metallogenetic background of gold deposits in the basin.Through tests on the crystal lattice gold contents from the ore-bearing and gold-free pyrite,we carried out prospect prediction and verification to the target areas.New discovery is the existence of quartz inclusion gold in pyrite,and the gold content is relatively high in some gold deposits.This work also shows that tests by common methods may ignore such gold,and may result in low content from analysis,leading to ore loss or inaccurate resource estimates.