ORES OF THE PRIMARY ROCKS. 573 
1. Magnetic oxide of iron, crystallized in large and small octohedrons and druses, over large surfaces 
in the fissures fn the ore, some of them richly iridescent. Some few crystals were cubic. 
2. Magnetic oxide of iron, compact, pure, and mixed with other minerals, as serpentine and hornblende. 
3. Magnetic granular ore. 
4. Common pyrites, granular and disseminated. 
5. Magnetic pyrites, massive, compact, granular and disseminated. 
6. Copper pyrites in small quantities. 
7. Carbonate of copper, in small quantities. 
8. Serpentine, disseminated in limestone, and massive. 
9. Amianthus in veins in limestone and serpentine. 
10. VAsbestus in the iron ore. 
11. Brown spar, crystallized. 
12. Rhombic spar, large crystals. 
13. Hornblende, crystalline, black. 
14. Augite, grey and green. 
15. Coccolite, green, very fine. 
16. Felspar, nearly black. 
17. Felspar, white. 
18. Mica, green and black. 
19. A mineral believed to be new, supposed to have been analyzed by Prof. Beck. 
This mine has been worked since 1823, and has furnished about two thousand tons per 
annum. The bed seems inexhaustible, as far as we could perceive, as it has been worked 
only about twenty feet deep, and there is little prospect of reaching the bottom. 
“ Forshee mines. These are half a mile southwest of the O’Neil mine. The mass is com¬ 
posed of a great number of layers of ore, alternating with the layers of rock. The whole hill, 
which is more than one-fourth of a mile long and nearly as wide, appears to consist of rock 
and ore, the ore forming a large proportion of the whole. Some layers are granular, forming 
handsome shot ore ; some are compact, and rather more free from pyrites than usual. In 
these mines are large bodies of the ore in black powder, which is entirely destitute of pyrites. 
Umber also is connected with the Forshee mines, and appears to be abundant and of fair 
quality. The minerals associated with the ore of the Forshee mines are red garnet, brown 
tremolite, green coccolite, serpentine yellow and black, calcareous spar, asbestus and mica.”* 
The strata here dip about forty degrees to the eastward, and gneiss underlies the ore. Its 
eastern boundary was not traced, but the bed of ore seems to be very thick, with strata of 
gneiss, hornblende and augite interstratified or interlaminated with it. Nearly the same 
minerals were observed here and in the vicinity, as at the O’Neil mines. The locality with 
the large sheets of mica is only about half a mile farther to the southwest; and the rocks 
west of this mine about half a mile, are filled with crystalline minerals. Garnet and augite 
abound. 
Dr. Horton, Third Annual Geological Report of New-York. 
