Source of the photo
http://www.chem.elte.hu/departments/altkem/tarczay/szervetlen/FT_szervetlen6_2009.pdf
Author of the description
Gruiz Katalin
The map shows the production of tungsten all over the World.
Tungsten is used in form of metal and in form of tungsten carbide:
W: tungsten lamps (due to high melting point), darts (high density)
WC, W2C: augers, bits
Source of description