County assessor's returns of ore worked in White Pine district during the quarter ending June 30, 1870-Continued.

Assessor's report of ore worked in White Pine district during the quarter ending September

30, 1870.

Assessor'e report of ore worked in White Pine district, &c.-Continued.

Assessor's returns of ore-worked in White Pine district during the quarter ending December

31, 1870.

Assessor's repor of ore worked in White Pine district, &c.—Continued.

The smelting-ore was in all cases sold on the dump, and those mines here marked "smelting" constitute less than one-half of those from which ore was extracted for that purpose. To get at a correct estimate of the ore worked in this district it will be necessary to add about one-quarter for small lots and low-grade ore not taxable.-A. J. B.

Statement of ore worked in White Pine during the quarter ending March 31, 1871, (taken from assessor's books.)

Statement of ore worked during the quarter ending June 30, 1871.

Statement of ore worked during the quarter ending September 30, 1871.

County assessor's returns of ore worked in White Pine district for the quarter ending December 31, 1871.

Several new mining districts have attracted attention during the year, but little has been done in these as yet beyond the location of claims and preliminary testing of the ores. Mr. A. J. Brown, who has visited these districts, sends me the following report:

The Schell Creek mines are situated in the Schell Creek range of mountains, about seventy-five miles northeast of White Pine district, and eighty miles south of Toano, the nearest station on the Central Pacific Railroad. The first discoveries of mineral-bearing lodes were made in the early part of June, 1871, about four miles north of the Schell Creek station on the old overland stage-road, and the Schell Creek mining district was organized. The formation containing the ledges is dolomite, overlying granite. The strata are very near horizontal in this part of the district, having a slight dip of only 6 or 8 degrees to the east, which is evidently caused by the eruption of masses and dikes of the rocks at the western base of the range. The dolomite appears to be entirely destitute of organic remains.

Very few of the mines are at all developed, but what little has been done has proved highly encouraging for their future value.

The McMahon ledge is situated low down, near the west base of the range, and very convenient for cheap working. The croppings are about 1,000 feet in length and 14 feet in thickness, and lie entirely in dolomite. The ledge is opened by a surface cut, exposing a face of ore, 20 feet in length by 8 inches thickness, that will average $75 per ton. A few tons of assorted ore, worked at the Big Smoky Mill, Hamilton, yielded $360 per ton. The gangue in this vein is principally quartz, intermixed with a small quantity of cale-spar. The ore is mostly silver-copper glance or stromeyerite, but black sulphurets, horn-silver, and some native silver occur also.

The Woodburn is situated about 300 yards above the McMahon, and near the summit of the range. This is a parallel vein, and is also incased in dolomite, the ore and gangue being similar to the last named. In fact, all the ledges situated wholly in the dolomite contain ore of the same character, and differ from the main mineral belt in containing a