An experimental study of gold leaching from host minerals of Hadamengou gold deposit and its geological implications.

The deposit, on the northern margin of the North China craton in Inner Mongolia, is of the hydrothermal type related to alkaline magmatism. Leaching studies of the three main types of ore found that Au and Fe dissolved simultaneously from haematite, indicating that Au is mainly chemically bonded in the lattice and/or colloidally adsorbed in iron oxides, whereas extraction of Au from pyrite lagged behind that of Fe, indicating that it is hosted mainly as grains of native metal. Previous studies have shown that the deposit is characterised by intense K-feldspathisation and a high content of iron oxides, occasionally replaced by sulphides. This may be China's first known iron oxide-type gold deposit.
The deposit, on the northern margin of the North China craton in Inner Mongolia, is of the hydrothermal type related to alkaline magmatism. Leaching studies of the three main types of ore found that Au and Fe dissolved simultaneously from haematite, indicating that Au is mainly chemically bonded in the lattice and/or colloidally adsorbed in iron oxides, whereas extraction of Au from pyrite lagged behind that of Fe, indicating that it is hosted mainly as grains of native metal. Previous studies have shown that the deposit is characterised by intense K-feldspathisation and a high content of iron oxides, occasionally replaced by sulphides. This may be China's first known iron oxide-type gold deposit.