1919.] 
Departmental Reports. 
49 
British Mica Company (Limited), Lebanon Road, Wandsworth, 
London S.W. 
Davis, Edward, and Co., 3 Fen Court, London E.C. 3. 
Everitt and Co., 40 Chapel Street, Liverpool. 
Micanite and Insulators Company (Limited), Blackhorse Lane, 
Walthamstow. 
Turing and Findlay, 41 Gracechurch Street, London E.C. 3. 
F. Wiggins and Sons, 102 Minories, London E. 1. 
The Ministry of Munitions, care of Messrs. W. A. Smith and Son, 
Cooper’s Row, Crunched Friars, London E.C. 3, is also a buyer of all grades 
of mica. 
TUNGSTEN-ORE. (By J. Henderson.) 
Owing to the largely increased demand for tungsten steel for munition- 
manufacture the mining of tungsten-ores has been greatly stimulated. At 
the present time the British Empire produces a large proportion of the 
world’s output of wolfram and scheelite. Of the total British production, 
Burma contributes about three-fourths, the other important producers being 
Queensland, New South Wales, New Zealand, England, and Rhodesia. Of 
foreign countries, the United States furnishes by far the largest amount, 
the production of tungsten concentrates in 1916 being 5,200 tons, and 
that of 1917 6,000 tons (estimated)*; then follow Portugal, Bolivia, 
Argentina, Peru, France, Siam, Japan, and China. The following table 
contains two estimates of the world’s yearly production of tungsten 
concentrates for some years past, and also gives New Zealand’s production 
to 1916:— 
— 
World’s Produc¬ 
tion in Metric Tons 
(Grifhths)t. 
World’s Produc¬ 
tion in Long Tons 
(Rastall)f. 
New Zealand's 
Production in 
Long Tons. 
Value of 
New Zealand's 
Production. 
1899-1910 
. . 
. . 
675 
£ 
55,065 
1906 
• . 
4,000 
, , 
, . 
1911 
6,105 
• • 
138 
11,853 
1912 
7,670 
8,780 
135 
13,347 
1913 
7,107 
10,000 
221 
22,933 
1914 
6,650 
8,000 
204 
21,498 
1915 
8,469 
12,000 
194 
27,784 
1916 .. 
19,000 
266 
49,070 
* Eng. & Min. Jour., vol. 105, No. 2, p. 90, Jan. 12, 1918. 
f H. D. Griffiths, Min. Mag., vol. 17, No. 2, p. 60, Aug., 1917. 
J R. H. Rastall, Geol. Mag., dec. v, vol. 5, No. 5, May, 1918, p. 194. Rastall 
gives detailed figures, some of which appear to be incorrect (e.g., those relating to New 
Zealand). Griffiths’s figures are incomplete. 
4—Science. 
