470 
GARFORTH : DEEP MINING. 
The following table (with supplementary list for the Yorkshire 
output) extracted from the Parliamentary Returns shews tlie (quantity 
raised in the several years : — 
Year. 
Total Tons of Coal raised 
in the United Kingdom 
Tons of Coal raised in 
Yorkshire. 
(including Yorkshire). 
TONS. 
TONS. 
1871 
117,439,251 
12,801,260 
1872 
123,393,853 
14,576,000 
1873 
128,544,400 
15,311,778 
1874 
126,590,108 
14,827,313 
1875 
133,306,485 
15,855,990 
1876 
134,125,166 
15,129,506 
1877 
134,179,968 
15,805,235 
1878 
132,612,063 
15,582,283 
1879 
133,720,393 
16,241,443 
1880 
146,969,409 
17,468,536 
1 ^1 1 RA ^00 
1 9i 9k7 1 ±^ 
10,^0 1,1^1 
1882 
156,499,977 
18,525,406 
1883 
163,737,327 
19,563,287 
1884 
160,757,779 
19,220,144 
1885 
159,351,418 
18,497,778 
1886 
157,518,482 
19,389,336 
1887 
162,119,812 
20,104,713 
1888 
182,660,160 
20,576,375 
1889 
189,633,656 
21,973,400 
2,797,344,007 
329,736,924 
Note. — It is a matter for regret that no record is kept of the depths 
at which the coal shewn in the table has been worked, consequently 
it is impossible to state the rate at which the average depth is 
increasing. The depth of the shaft is no criterion, as seams lying at 
different depths may, by inclines and tunnels, be raised from the 
same level. It is to be hoped some arrangement will shortly 
be made to obtain such information. With a return of the 
area and thickness of the seam worked within certain limits of 
depth, an approximate tonnage might be given. 
The greatest depth of shaft in 1871 was 2,376 feet, as compared 
with 2,850 feet at the present time. The latter does not however 
fully represent the greatest depth at which coal is now being worked, 
as some seams are worken by means of inclines. 
Many collieries from which large quantities of coal have been 
obtained in the past are now exhausted, the shafts closed, and the 
works abandoned. 
