Resumen de Vietnam antimony: exploration accelerates
Found in the Lang Can commune, Na Hang district, Tuyen Quang province, this mine has two primary ore bodies. The first is 150 metres long with a thickness of 0.3 metres and Sb content of 38.39%. The second is 100 metres in length with a thickness of 0.5m and Sb content of 16.98%. Total reserves (P 2 ) are 34,625 tonnes, corresponding to 4,107.21 tonnes of Sb.
These seven quartz-bearing veins are 700 metres in length with a thickness of 30-40 metres and pitch on the west side at a slope angle of 70 o. They are located in Quang Thanh, Hai Ha district, Quang Ninh province. Antimony mineralisation distributes in grey schist and sandstone of Tan Mai formation along hydrothermal quartz veins. There are three large veins, ranging between of 70-210 metres in length and 0.6-1.2 metres wide. The antimony is concentrated into nests, lenses and small veins, while the mineral composition consists of antimonite, pyrite and chancopyrite. Sb content is poor, usually only reaching 1%, although there are a few cases where 7-8% is found. Fe is 1.1%, while S is 2.93%. The mine was exploited by the French from 1916 and a preliminary evaluation put reserves at 1,200 tonnes.
2 The Chiem Hoa zone in Tuyen Quang province has an antinomy potential of about 400,000 tonnes, with the Lang Vai mine having approximately 10 tonnes Au, 103 tonnes Ag and 139,000 As. Searches will take place deep into Lang Vai, while the basic investigation will be enlarged to the take in the whole of the Chiem Hoa ore zone. This will cover mines such as [Khuon Phuc], Lang Can, Coc Tay and Hoa Phu in a bid to create an exploitation industry.
