84 TRANSACTIONS OF THE [Nov. 20, 
line, i. e., normal to the general strike and trend of the country, 
and this fold has then been tilted to a very steep pitch to the 
north and doubtless broken by a great fault somewhere in this 
direction. The broken condition of the igneous rock and its 
appearance as stretched and isolated masses argues its intrusion 
before this excessive folding and disturbance. 
How much of this fold and ore has been eroded, we have no 
means of knowing, but if the above statement (4) is true, as 
there seems reason to believe, and the pitch holds for some con- 
siderable depth, the point at which the workings of the Passaic 
Company will meet the pitching trough of the fold, can be 
approximately plotted. The foot-wall will come in not so much 
from the west as from the south. Fig. 3 is an attempt to sketch 
the general shape of the ore, without attendant walls. 
The questions that at once suggest themselves as to whether 
the ore was formed before the folding occurred, and as to its 
source can be best treated in connection with Franklin Furnace, 
to whose description we now pass. 
THE FRANKLIN FURNACE ORE Bopy. 
The relations at Mine Hill are somewhat analogous to those 
at Stirling Hill, and yet are more complicated. The ore bed 
shows a similar northerly pitching fold, but with a much less 
steep pitch. There is also reason to think that on the east 
a small anticline comes in. In the front or west bed the ore is 
much nearer the contact with the gneiss than at Ogdensburgh, 
and seems clearly to be at a different horizon in the limestone. 
It begins on the north, as shown on the map. Fig. 4, in the 
“front vein,’ near the Hamburg road, and runs south 30° west 
for about 2,500 feet. It then bends around in a sharp fold 
forming the back vein and strikes to the east, at an angle of 
about 30°, and after running some 600 feet, pitches below the 
surface at an angle of 27° or 28°. The borings for the new 
shaft of the Lehigh Company have proved it to continue for 
about 2,000 feet further,and when the pitch of the bed as shown 
in the Buckwheat Mine is plotted, and an allowance made for 
topographical differences of level, the known depth of the bor- 
ings to ore (1,000 feet) checks very well with a pitch of 28°. 
The line of the ore underground is indicated on Fig. 4 by a 
heavy broken line. How much further it runs will be an inter- 
esting thing for future workings to determine. 
The old mine at the north end of the front vein is called the 
Hamburg, or the Hamburg Road Mine. In it the interesting 
mineral sussexite was discovered. The workings south of this 
