In 1877 the maximum annual output for the mines was attained, being $3 6, 3 01, 537.
The output for the year is less than 4000 tons.
Since high average speed on a line with frequent stops depends largely on rapidity of acceleration, the tendency in modern equipment is to secure as great an output of power as possible during the accelerating period, with corresponding increase in weight available for adhesion.
The company also owns iron mines, limestone and quartz quarries, large iron-works at Domnarfvet and elsewhere, a great extent of forests and saw-mills, and besides the output of the copper mines it produces manufactured iron and steel, timber, wood-pulp, bricks and charcoal.
Queensland's annual output is between 750,000 and 800,000 oz.; the number of men engaged in goldmining is io,000.