According to the analysing of groundwater recharge,runoff,draining of groundwater and dynamics of springhead and so on,the authors have considered that the main causes of Baiquan springhead cutoff are the decrease in atmospheric water and artificial overexploitation groundwater.

The removal of montan resin in montan waxes from Liaohu, Xundian, and Zhaotong brown coals, refinement of resin removed montan waxes (pure waxes)by oxidation of Na 2Cr 2O 7·2H 2O and H 2SO 4 have been done to explore the possibility of producing the modified O, E, OP montan waxes from the refined Chinese montan waxes.