| Year |
Amount of ore tons |
Approximate value US$ |
| 1913 |
2 269 |
120 000 |
| 1914 |
4 294 |
441 300 |
| 1915 |
47 000 |
693 750 |
| 1916 |
20 300 |
500 000 |
| 1917 |
33 404 |
No data |
| 1918 |
18 860 |
957 000 |
| 1919 |
14 509 |
1 630 900 |
| 1920 |
35 076 |
2 401 000 |
| 1921 |
8 540 |
876 000 |
| 1922 |
929 |
166 016 |
| 1923 |
2 025 |
150 000 |
| 1924 |
No data |
No data |
| 1925 |
13 070 |
331 000 |
| (1 ton = 1.016 tonnes) |
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