trace of phosphorus. Later analyses, however, indicate that apatite was quite abundant.

II.

Sample cobbed ore from shaft No. 12, northeast of No. 7. III. Sample cobbed ore from shaft No. 6, northeast of No. 12. IV. Sample coarse, granular ore, 4-8 in. wide, near hanging wall. V.-Sample from pillar in Byram slope.

References: N. J. 1855, pp. 211–215; 1868, pp. 567-569; 1873, pp. 43-44; 1879, p. 51; 1880, p. 105; 10th Census, p. 168; 1882, p. 70; 1883, p. 99; 1884. p. 82.

(239) The Baker Mine.

The Baker mine (the southeast Baker of the Report of 1868) was in Randolph Township, Morris County, just northeast of the Byram mine and southeast of the Millen mine.

The mine was in the same general range as the Byram, Chas. King and Bryant mines, but its ore came from a vein that lay further west, possibly on the vein that yielded ore at the King and McFarland mines. The mine was worked before the year 1868 It to the depth of 100 feet on a deposit from 5 to 6 feet wide. was closed during 1868, but was apparently reopened a few years later and operated for a short time. It was idle in 1879 and had then been abandoned for several years.

References: N. J. 1868, p. 570; 1879, p. 52.

(240) The Millen Mine.

The Millen, or Mellen, or Millon, mine, in Randolph Township, Morris County, is on Mine Hill, a few hundred yards south of the road between Dover and Kenvil. A few hundred yards to the south of west is the Baker mine, and a few hundred yards to the southwest is the Byram mine. Further south, on the strike of the Millen vein, are the openings of the Brotherton mine. The Millen mine was opened and abandoned before 1855During this early period of activity the ore had been removed

to a depth of 130 feet. It was reopened shortly after this year and by 1868 it had been worked to a depth of 250 feet and for a length of 200 feet in an ore body that was 2 feet to 5 feet wide on the surface, and gradually widened to 5 feet below. Its dip was very steep to the southeast. The vein contained a small horse of rock and was cut by a transverse fault that caused an offset of a few feet. In some places the ore and rock passed into one another through repeated alternations of seams of the two substances.

The mine was closed shortly after 1873. It was again reopened in 1880 and worked until 1883, when it was abandoned. In 1880 ore was being raised through a shaft 255 feet deep. During the census year 1,263 tons were mined. Its total yield was probably large, though we have no figures that give us any accurate idea of its magnitude.

A sample of ore taken from several carloads by the chemists of the 10th Census gave:

Fe43.73; P = .583. Authority: 10th Census, p. 169.

References: N. J. 1855, pp. 210-211; 1868, pp. 564–565; 1873, p. 43; 1879, p. 51; 1880, p. 105; 10th Census, p. 168-169; 1884, p. 83.

The Hance Mine.

The Hance mine was simply the extension of the line of attraction passing through the Millen mine. So far as is known it was never worked.

Reference: N. J. 1868, pp. 565-6.

(241) The Randall Hill Mine.

The Randall Hill mine was an important one prior to 1868. It is in Randolph Township, Morris County, on the strike of the Byram vein and about one-eighth of a mile north of the Millen mine.

Two deposits were worked before 1855 through a shaft 300 feet deep. The mine was, however, abandoned before this date. Shortly afterwards it was reopened and worked intensively. By 1868 the workings had been extended for a distance of 600 feet

and to a depth of 450 feet on a dip of 45°. Operations continued until 1882, when the mine became so deep that it was no longer possible to raise ore with profit. It was then abandoned.

The ore came from three parallel veins, of which the largest measured from 2 to 8 feet in thickness. These were cut by a number of faults with throws to the right (see Fig. 20).

Plan of faults at the Randall Hill mine. (From Ann. Rep. State Geol. N. J. for 1883, p. 63.)

In 1880 the deposits were worked through two slopes, of which one was 700 feet deep and the other 300 feet deep. Between the two was a fault with a throw to the right of 21 feet. At the deepest point in the mine the deposit was 3 feet to 3.5 feet thick.

A sample of the ore taken from the cars in 1880 analyzed:

Fe= 44.51; P=.577. Authority: 10th Census, p. 169.

In the census year 1879-1880 the mine produced 8,360 tons of ore.

References: N. J. 1855, p. 210; 1868, p. 570; 1873, p. 43; 1879, p. 51; 1880, p. 105 10th Census, p. 100; 1882, p. 70; 1883, p. 100.

(242) The Jackson Hill Mine.

The Jackson Hill mine in Randolph Township, Morris County, was another important mine fifty years ago. It worked the northeast extension of the Randall Hill mine, all the way down the northeast slope of Mine Hill, a distance of about 1,000 feet.

The mine was worked before 1855 and abandoned. It was again opened before 1868 and worked until about 1876, when it was again abandoned, as the workings had reached the property line.

The vein, which was exploited to a depth of 125 feet, varied greatly in thickness, that portion which was worked being from 10 to 14 feet wide.

References: N. J. 1855, p. 210; 1868, p. 570; 1873. p. 43; 1879, p. 51.

(243) The Spring Mine.

The Spring mine, in Randolph Township, Morris County, is one of the Irondale group (see pages 366-367). It was east of the Corwin mine and west of the Jackson Hill mine, in the valley of Morris Spring Brook.

The mine was apparently on a distinct vein not connected with that worked by any other mine. It was in active operation during 1868, at which date it had removed the ore from a 3 to 5-feetthick deposit to a depth of 50 feet and through a length of 400 feet. The ore is said to have been of good quality. Shortly afterward the mine was abandoned.

Reference: N. J. 1868, p. 575.

(244) The Stirling Mine.

The Stirling, New Stirling, Hubbard and North River mines. worked the same group of ore bodies, and were so intimately connected that it is difficult to discuss them separately (Fig. 21).

Plan of ore vein and faults at the Stirling Mine, Wharton. (From a map and survey by L. C. Bierwirth.)

They were all situated in Randolph Township, Morris County, just south of Wharton.

The Stirling mine is the best known of the Irondale group of mines. Its southernmost shaft is a few hundred yards northeast of the Spring mine, and its northernmost shaft about the same distance southwest of the Hubbard mine. The Hubbard and North River mines worked the same shoot, which lay above the Stirling shoot and further northeast. The Hubbard mine was on its southwest end and the North River mine at its northeast end. The New Stirling was a slope situated on the Hubbard property, through which was worked the northeast end of the Stirling shoot, which at this place was beneath the Hubbard-North River shoot (see page 369).

According to C. T. Jackson the Stirling, or Sterling, mines were first worked by a party of Nassau miners in 1640. However this may be, the mine was operated long before 1855, and by 1868 had yielded about 150,000 tons of ore. From this time it was worked almost continuously until 1885.

The ore deposit varied greatly in width. It possessed a dip of 30°-45° southeast and pitched 10°-18° northeast. In 1855 the vein had been opened for a distance of 300 feet to a depth of 100 feet. In 1868 the depth of the mine had increased to 250 feet and its length to 600 feet. The principal shoot on which the early mining was done had been followed about 1,500 feet by 1879. Its total length was later found to be 1,800 feet, its average thickness 7 feet and its height between 90 feet and 150 feet. The dip of its foot wall averaged about 45° southeast and the pitch of the bottom rock 15°-18° northeast. At the bottom of the mine, when work stopped, the ore had pinched to a foot in width. Drill holes put down vertically at 385 and 415 feet southeast of the outcrop of the North River shoot found ore at 338 feet and at 365 feet from the surface. This was regarded as indicating that the Stirling shoot extends northeastward under the North River mine, i. e., that a second shoot lies under that of the North River mine.

The ore was crumbly, was much stained with limonite and contained considerable apatite, the quantity of this mineral being much greater in the middle stopes than in the end stopes. sample of the ore taken from the cars in 1880 gave:

Fe58.80; P= 1.342. Authority: 10th Census, p. 170.

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