256 



MINERAL STATISTICS 



British : 

 Copper ore 

 Metal . 



Foreign : 

 Copper ore 

 Metal . 



British : 

 Leiid ore 

 Metal 



Foreign : 

 Lead ore 

 Metal . 



British : 

 Zinc ore . 

 Metal . 



Foreign : 

 Zinc ore . 



British : 

 Iron ore . 

 Metal . 



Foreign : 

 Iron ore . 



Bar or merchant 

 iron 



The consumption of coal in the iron manufacture is computed, upon the information 

 furnished to the Royal Coal Commission, at the rato of three tons of coal used, for all 

 purposes, to each ton of pig-iron produced. For the year 1872 the Mining Record 

 Office sought and obtained returns of the coal used for nearly all the blast-furnace 

 establishments. As the result of the economy -which has been rigidly pursued since 

 the advance in the price of coal, we have only 51 cwts. of coal given as used for each 

 ton of pig-iron produced. This -will give the quantity used in 1872 as 17,191,918 tons 

 only. As it is probable that the quanity given in 1871 is in excess, both years have 

 been computed in the Table at the 1 same rate, for strict comparison. 



The returns of coals produced, as given by the inspectors, differ from those which 

 appear in the mineral statistics for 1872, as shown below, by the addition of the coal 

 raised in Ireland : 



It has been shown that the increased quantity of coal carried by the railways is 

 above 4,305,617 tons. It is thought, however, that the following estimation, made 

 with great care, will have a very close approximation to the truth, as showing the 

 total increase : 



