The Mafjnetite Belt at Cranberry, N. C. — Kiinhall. 805 
Underground workings thus connected rise to near the floor 
of the quarry, at the nearest edge of which at one point they 
break through to daylight. The thickness of the main ore 
body at the level of the upper tunnel is 65 ft. The diiference 
in section at the two tunnels is due to the lenticular configur- 
ation of the ore lens. All of the workings advance in the 
direction of tlie strike. Neither workings on the strike ex- 
ceeded 400 ft. in length in the year 1891, and 40 ft. in hight, 
Avhile both are driven into solid ground beyond the vertical of 
the quarry face. 
The quarry face is advanced from the floor and from two 
benches above, the former being 45 ft. above the upper level. 
Three working breasts are thus maintained each 50 ft. in 
hight. Abandoned shallow excavations still higher on the 
hillside expose an upper lens. These were wrought for the 
sake of iron sands from disintegration of this small super- 
ficial division of the ore belt. The face of the hillside now 
occupied by the present quarry was originally wrought in the 
same way for the supply of the old bloomary. 
The thickness of the ore belt at the surface as shown by 
graphic construction is about 250 ft. including the upper lens, 
or 205 ft. to the superficial edge of the quarry, these measure- 
ments being at right angles to the dip. The horizon of the 
foot wall is clearly defined in the lower tunnel, at which level 
the ore developments, judging from the boring, seem limited 
to a thickness cf 152 ft. The upper and middle divisions of 
the ore belt are disclosed in the quarr^'' face, though nothing 
like a hanging wall has been reached in any of the workings. 
From the present compass of the quarry it has been eroded. 
Of any given thickness of the ore belt only a varying por- 
tion is made up of workable ore. A large propoi-tion of the 
refuse is adapted to magnetic separation or concentration. 
From the above description it will be understood that besides 
the main ore body which crosses the whole quarry face, pass- 
ing on the rise into the right wall, attenuating parts of five 
lenses similarly disposed are wrought in the quarry all of 
which in the summer of 1891 could be more or less distinctly 
traced by coloration. It also appears that the net tliickness 
of the differentiated ore lenses varies at intervals with the 
section. 
