details | 7,360,725,100 |
| District E. | | | |
| Northumberland | 7,040,348,127 | 1,530,722,486 | 5,509,625,641 |
| Cumberland | 2,188,938,830 | 661,230,025 | 1,527,708,805 |
| Durham | 6,607,700,522 | 1,336,584,176 | 5,271,116,346 |
| District F. | | | |
| Scotland | 21,259,767,661 | 5,579,311,305 | 15,681,456,356 |
| District G. | | | |
| Ireland | No details | No details | 174,458,000 |
+--------------------------+----------------+---------------+----------------+

As regards the duration of British coal resources, the commissioners
reported (1905):--

"This question turns chiefly upon the maintenance or the variation of
the annual output. The calculations of the last Coal Commission as to
the future exports and of Mr Jevons as to the future annual
consumption make us hesitate to prophesy how long our coal resources
are likely to last. The present annual output is in round numbers 230
million tons, and the calculated available resources in the proved
coalfields are in round numbers 100,000 million tons, exclusive of the
40,000 million tons in the unproved coalfields, which we have thought
best to regard only as probable or speculative. For the last thirty
years the average increase in the output has been 2-1/2% per annum, and
that in the exports (including bunkers) 4-1/2% per annum. It is the
general opinion of the District Commissioners that owing to physical
considerations it is highly probable that the present rate of increase
of the output of coal can long continue--indeed, they think that some
districts have already attained their maximum output, but that on the
other hand the developments in the newer coalfields will possibly
increase the total output for some years.

In view of this opinion and of the exhaustion of the shallower
collieries we look forward to a time, not far distant, when the rate
of increase of output will be slower, to be followed by a period of
stationary output, and then a gradual decline."

According to a calculation made by P. Frech in 1900, on the basis of the
then rate of production, the coalfields of central France, central
Bohemia, the kingdom of Saxony, the Pr