700 
Yorkshire being 296,838 tons. The produce in 1856 being 
275,600 tons ; showing an increase of 21,238 tons. 
The exportation of pig iron from Middlesbro' for the last 
three years has been in 1855, 20,418 tons; 1856, 49,801 
tons; 1857, 69,900 tons; and of wrought iron we sent to 
foreign countries, from the same port, in 1857, 44,594 tons. 
Iron Pyrites — (Coal brasses.) — An attempt has been 
made to determine the quantities of the iron pyrites of the 
coal measures which have been employed during the year in 
the manufacture of sulphuric acid and copperas (sulphate of 
iron) in the chemical works of the West Riding. From the 
neighbourhoods of Halifax, Todmorden, Huddersfield, &c, 
3,560 tons were raised, the value of which was £1,572. 
Coal The production of coals from the different dis- 
tricts of the West Riding of Yorkshire, from 374 collieries, 
has been 8,875,440 tons. In 1856, the coal production of 
the West Riding amounted to 9,083,625 tons, showing a 
falling off of 208,185 tons. The details of the production 
of this large quantity of fuel, which have been determined 
with much care, are as follows : — 
DISTRICT. 
No. of Collieries. 
Coals raised. 
74 
2,568,000Tons 
48 
976,500 „ 
50 
315,520 „ 
50 
2,521,420 ; , 
30 
410,000 „ 
36 
740,000 „ 
18 
458,500 „ 
26 
490,000 „ 
26 } 
4 
5 
395,500 „ 
7 . 
Total 
374 
8,875,440 Tons 
