Prof. Johnson's Report on the Bradford Coal Field, 145 
It lost of water, by heating to 320°, - - 38 per cent. 
And ata white heat, = - . -- bPiek 
Of pig iron, it gave —— = - - ~ ) ABA 
Earthy matter, - - - - - pr 
“The pig metal was gray, tough, and moderately soft; the cinder 
opaque, grayish white. In this assay, the cinder was rather imperfectly 
reduced, and some portions were probably lost. 
“No. 6. This.specimen of ore was taken from a pit sunk about 8 feet 
deep, near Mason’s coal mines, on the head waters of Wagner’s run; the 
band of flattened balls, very closely compacted together, is six inches. 
This band of ore is found near the northeasterly outcrop of the series of 
coal measures, a few feet only above the level of the heavy stratum of 
conglomerate rock, which marks so distinctly the limit of the basin in 
that direction. In this same locality, are exposed three other strata of 
ore, the first of which is 53 feet above the one now under consideration, 
the second 62 feet, and the third about 7} feet. This last is a band of 
balls, as will be more particularly stated below; hence, it will be seen, 
that all four of these bands of ore may be worked together, within a ver- 
tical height of 8 feet. ‘The total thickness of the four bands being about 
18 or 19 inches, and the intervening matter to be mined out, ferraginous 
slate, and rather friable sandstone, will not, I apprehend, present any se- 
rious difficulties in the mining. 
*“The following section shows the whole of these measures, commen- 
cing at the top. 
1. Balls of iron ore, - - - - 0 feet 3 inches. 
2. Slaty sandstone, - - - . ie aa | lead 
3. Upper band of iron ore, - - Cs ee 
4. Siliceous iron shale, - - - ey ee 
5. Middle band of kidsing, ore, ae - oe s 
erruginous slate, - ie? GA eae 
7. [ower band of compact al of tom oe, ee 
8. Iron shale, - i. eo 
9. Black slate, - ae se os * 
10. Iron shale, eth  . 
“The four varieties of ore eer at the hore jeskiney, are also met 
with in rarious other situations, especially on Long Valley creek, in the 
bed of which, samples exactly similar to the lower band of the above 
section, have been observed in numerous places. This band is of a du- 
rable texture, and appears to resist more firmly than the accompanying 
materials, the decomposing action of the atmosphere, and hence it con- 
tinues unaltered in places where all the others have been washed away. 
The specific gravity of this Bee: band is 3.265. 
Vol. xxxrx, No. 1.—April-June, 1840. ee 
