The figures are based on the total number of persons employed in mines under the Coal Mines Regulation Act, after deducting the estimated number engaged in
raising minerals other than coal. See Note* p. 25.
+ British Columbia and Nova Scotia only for 1906 and prior years. In later years the particulars for Saskatchewan and Alberta are also included. These four provinces
accounted for about 99 per cent. of the total production of the Dominion in 1912. The number of persons employed in and about coal mines in the other provinces cannot
be stated.
Defective in details.

§ These figures relate to the average number of persons employed during each year. The decrease in 1923 is attributable to the occupation of the Ruhr.
The figures relate to January-July; at end of December 776,886 were employed below ground and 962,831 above and below ground.
Provisional figures.
**Average for two years.
†† From 1919 the figures are for the Austrian Republic.
Includes Polish Upper Silesia for the whole year.
8 The figures for Natal represent the average number of persons employed at producing collieries on productive work during the period of output in 1906 and
previous years. In the years 1907 to 1910 the figures represent the average number of persons employed on productive work during the year. The particulars for 1911 and
later years for each State of the Union of South Africa show the average number of persons at work in all collieries during the year.

*

++ Including reparations coal.

Imports by Sea only. The figures are for the twelve months ended 31st March of the year subsequent to that stated.
Years ended 30th June, up to and including 1906, after which the figures are for the twelve months ended 31st of March of the year subsequent to that
stated-the end of the fiscal year having been changed from June to March by Act No. 12 of 1906.

The Union of South Africa, comprising the Provinces of Cape of Good Hope, Natal, Orange Free State (formerly Orange River Colony), and Transvaal, was
formed with effect from 31st May, 1910. Trade between the various Provinces of the Union is excluded in 1910 and later years, but included in prior years.
See Prefatory Note, p. 22. The exports of domestic produce from Cape Colony did not amount to 1,000 tons in either of the years 1901-04; in 1905 the exports
of coal were 63,000 tons, consisting chiefly of re-exports.

Including coke in 1906 and later years.

§§ Average for two years.

**

*Average for four years.

+ Less than 500 tons.