Characteristics and genesis of the Yiermand hot-spring gold deposit in Yining county, Xinjiang.

The deposit occurs in hydrothermally eruptive breccia in the Lower Carboniferous Dahalajunshan Formation. Ore-forming processes can be divided into hydrothermal-eruptive sedimentary and metasomatic stages. During hydrothermal sedimentation, hydrothermally eruptive breccia and other hydrothermal sediments were formed and gold was concentrated. Circulation of underground water caused the metasomatism of the hydrothermally eruptive breccia, thus concentrating gold again and forming the hot spring gold deposit. Ore-bearing rocks are rich in Au, Ag, As, Sb, Hg and Bi and poor in Cu, Pb and Zn. Mineralisation occurred during the Early Carboniferous near the surface, at temperatures of around 80-90 degrees C and salinities lower than 1% NaCl.
The deposit occurs in hydrothermally eruptive breccia in the Lower Carboniferous Dahalajunshan Formation. Ore-forming processes can be divided into hydrothermal-eruptive sedimentary and metasomatic stages. During hydrothermal sedimentation, hydrothermally eruptive breccia and other hydrothermal sediments were formed and gold was concentrated. Circulation of underground water caused the metasomatism of the hydrothermally eruptive breccia, thus concentrating gold again and forming the hot spring gold deposit. Ore-bearing rocks are rich in Au, Ag, As, Sb, Hg and Bi and poor in Cu, Pb and Zn. Mineralisation occurred during the Early Carboniferous near the surface, at temperatures of around 80-90 degrees C and salinities lower than 1% NaCl.