Abstract

On the basis of analyzing and synthesizing the existing data from regional geological mapping, mineral survey, exploration and mining, this paper present some results of study on quality characteristics and resource assessment of manganese ore in Trà Lĩnh - Trùng Khánh area, Cao Bằng. Our study results indicated that the study area has rather favorable geological settings for the formation of manganese mineralization of sedimentary genesis. Stratigraphic and petrographic factors play an important role for the formation and distribution of manganese ore in the area. Manganese ore of industrial value is concentrated in the sediments of Tốc Tát Formation. The main ore minerals are psilomelane, pyrolusite, manganite, braunite, hausmannite, rhodochrosite, rhodonite... The average Mn concentration in the orebodies and mineralization zones varies from 5.88% to 52.41%, in average 15-20%, classifying as the moderate to high content ore type. The manganese content distribution is fairly stable to unstable.

The potential of manganese ore is rather large, mainly distributed in the Tốc Tát, Roỏng Tháy, Lũng Luông areas and less in the Bản Khuông, followed by Nộc Cu and Hạ Lang areas.