Abstract:

Located in the southern Qinling Mountains, the Huachanggou gold deposit is a small gold deposit which is currently being mined. On the basis of detailed field geological survey and systematic laboratory study including microscope observation, electron probe scanning, X-ray surface scanning, the occurrence of gold has been identified. The result shows that the gold exists mainly as independent mineral phase; the carriers are pyrite, quartz, dolomite, chalcopyrite and tennantite. The gold minerals are native gold with the fineness of 945 to 982. Neither argentiferous native golds nor electrums are found. Gold is embodied as inclusion, fissure-filling, intergranular and interlocking form. The gold granularity is mainly characterized by micro particulate (0.010-0.005 mm, which accounts for 44%), micro fine particulate (0.02-0.01 mm, which accounts for 22%) and extra micro particulate (0.005-0.001 mm, which accounts for 19%). The micro medium-to-giant grained golds are less in number, however, they are significant to ore grade and total resource. The authors also discussed the causes and significance of the high fineness and the distribution of granularity of the native gold.

Key words: Huachanggou gold deposit, occurrence of gold, fineness of gold, Shaanxi Province