AMOUNT OF ORE RAISED FROM THE MINES.-The amount of ore raised from the mines on the Comstock lode may be put down at the present time at about 1,500 tons daily, and the total amount raised since the commencement of operations at about 2,000,000 tons. The following table, compiled by S. H. Marlette, the surveyor general of Nevada, from returns made to the assessor, for the year 1866, shows the number of tons produced quarterly by the several mines, which yielded more than $20 per ton. Some mines, owning mills of their own, work rock yielding as low as $15 per ton, but no record of this becomes public, and is very difficult to obtain, chiefly owing to disinclination on the part of owners of unincorporated mines to make their operations public. The table also shows the yield of the ore per ton.

YIELD OF ORE PER TON.-From information furnished by the superintendents of the following mines, the yield per ton appears to be

Savage mine-30,250 tons produced in the last six months of 1866, yielded an average of $42 93 per ton.

Hale and Norcross mine-16,836 tons produced in the same time, yielded an average of $50 33 per ton.

Gould and Curry mine-62,425 tons produced in 1866, yielded an average of $28 64 per ton.

The following table shows the number of tons of ore, worth more than $20 per ton, produced quarterly by mines on the Comstock lode, names of the mines, and yield of some of the ores:

COST OF MINING PER TON.-The following items are from official sources: Savage mine-average cost per ton of the last six months of 1866.

Gould and Curry mine-average cost per ton for the 12 months ending November

30, 1866.

$0 21

2 11

3 10

1 82

62

7 86

Total cost per ton.....

Hale and Norcross mine-average cost per ton for the 12 months ending March

These results show a marked improvement on previous years, and enable lower grade ores to be worked more profitably than was formerly the case. Some portion of the diminution in cost is due to the lower price of material, but by far the greater part to more efficient management and systematization of labor.