TUNGSTEN Indian Minerals Yearbook 2018 (Part- II :Metals and Alloys) 57th Edition TUNGSTEN (FINAL RELEASE) GOVERNMENT OF INDIA MINISTRY OF MINES INDIAN BUREAU OF MINES Indira Bhavan, Civil Lines, NAGPUR – 440 001 PHONE/FAX NO. (0712) 2565471 PBX : (0712) 2562649, 2560544, 2560648 E-MAIL :
[email protected] Website: www.ibm.gov.in June, 2019 18-1 TUNGSTEN 18 Tungsten ungsten is a hard steel-grey shiny metal that Resources of tungsten-bearing minerals Tis often brittle and hard to work and is of are mainly distributed in Karnataka (42%), strategic importance. The chief sources of Rajasthan (27%), Andhra Pradesh (17%) and tungsten are minerals scheelite (CaWO4) and Maharashtra (9%). The remaining 5% resources wolframite [(Fe,Mn)WO4] which are predominantly are in Haryana, Tamil Nadu,Uttarakhand and West hydrothermal in origin. Tungsten has a melting Bengal (Table- 1). o point of 3,422 C, the highest of all metals and is At Degana, Rajasthan, out of 7 blocks, the resistant to all acids at ordinary temperatures. It minimum and maximum values of WO3 were is elastic,ductile and has high tensile strength and noticed, 0.09% & 1.62% respectively. At Balda of can be drawn into very thin wires. Thus, tungsten Sirohi district, Rajasthan, the average WO3 is the most important metal for thermo-emission content ranges from 0.24 to 0.48 per cent. In Dewa- applications not only because of its high electron Ka-Bera of Sirohi district the average WO3 is 0.03% emissivity but also because of its high thermal and and in Udwarya of Sirohi it is 0.27%.