will increase the capacity from 600,000 to 700,000 gallons in
twenty-four hours, or about forty-five miners' inches.

Owing to the excellent showing of ore obtained on the 3,000 level by
the Hale & Norcross Company, and to the continuation of the ore below
that level (as shown by a winze sunk in the vein), the management
determined to sink the shaft to the vertical depth of 3,200 ft. It is
now 3,120 ft. deep, and it is safe to say that it will reach the depth
of 3,200 ft. early in September, when it will lack but eighty feet of
being as deep as the shaft at Przibram was at the time of the great
festival. Although the shaft is of great size--about thirty feet by
ten feet before the timbers are put in--the workmen lower it at the
rate of about three feet a day, in rock as hard as flint.

The hydraulic pump now working at the 3,000 foot level of the shaft is
the deepest in the world. In Europe the deepest is in a mine in the
Hartz Mountains, Germany, which is working at the depth of 2,700 feet.
It is, however, a small pump not half the size of the one in the
Combination shaft. Although these pumps were first used in Europe,
those in operation here are far superior in size, and in every other
respect, to those of the Old World, several valuable improvements
having been made in them by the machinists of the Pacific coast.

The capacity of the two Cornish pumps, which lift the water from the
2,900 foot level to the Sutro drain tunnel (at the 1,600 level), is
about 1,000,000 gallons in twenty-four hours, and the capacity of the
present hydraulic pumps is 3,500,000 gallons in the same time. They
are now daily pumping, with both hydraulic and Cornish pumps, about
4,000,000 gallons, but could pump at least 500,000 gallons more in
twenty-four hours than they are now doing. The daily capacity with the