Precious metals in the lincang ge ore deposits, Yunnan, China

Precious metals are highly enriched in the high-Ge coal and host rocks • Precious metals can be concentrated in the upper, middle and lower portions of the coal seam section • The highly elevated concentrations of precious metals are attributed to hydrothermal solutions that captured precious metals from magma chamber during its long-term circulation in the coal basin and deep underground along basin faults • The coals are enriched not only in Ge and W, but also in Be, U, and Nb, indicating that the hydrothermal solutions are alkaline N₂-bearing water mixed with volcanogenic CO₂-bearing chloride-sulfide volcanogenic solution.