In connexion with the Warora colliery there is a fire-clay business.
The Mopani colliery, which dates back to 1860, is worked by a joint-stock company.
After the year 1884 Labour troubles became very frequent, the New South Wales coal miners in particular being at war with the colliery owners during the greater part of the six years intervening between then and what is called the Great Strike.
The following works may also be consulted: Books - Bertolio, Coltivazione delle minere (Milan, 1902); Brown, The Organization of Gold Mining Business (Glasgow, 1897); Brough, Mine Surveying (12th ed., London, 1906); Bulman and Redmayne, Colliery Working and Management (London, 1896); Colomer, Exploitation des mines (Paris, 1899); Curle, The Gold Mines of the World (2nd ed., London, 1902); Demanet, Traite d'exploitation des mines de houille (2nd ed., Brussels, vols.
this difficulty was overcome by paving or " causewaying " the road up to the level of the top of the flanges, but 1 " Another thing that is remarkable is their way-leaves; for, when men have pieces of ground between the colliery and the river, they sell leave to lead coals over their ground " (Roger North).