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Formerly it was extensively wrought, open to the sky, to a depth 

 of seventy feet, and length of one hundred yards. Within only a 

 few paces to the southeast of this opening, which is called the 

 Blue Hole, is another in a more circumscribed vein, of a len- 

 ticular form, called the Mule Ore. This shorter vein is divided 

 through its middle by a wedge or horse, consisting principally 

 of massive crystallized hornblende. 



Exclusive of this intruded mass, the vein, at its widest place, 

 where it is at present worked, is twenty-five feet in thickness. 

 At a somewhat greater distance, on the opposite or northwest 

 side of the principal vein, occur three or more similar detached 

 small veins, or, as we ought, perhaps, more properly to say, lenti- 

 cular portions of the general vein. One of these pots or pools 

 of ore, denominated the Henion Mine, is about fifty feet in length 

 by ten feet in thickness. It has been wrought to a considerable 

 extent, yielding an ore of excellent quality. 



The ore of this and some of the other small subordinate veins 

 possesses the magnetic character in a distinguishing degree. 



The whole of the ore of this immediate vicinity of the Mule 

 Mine is stated to make a good iron, which is apt, however, to be 

 red short, or brittle, at a red heat. 



The pitch of the principal vein of ore of the Mule Mine is 

 parallel to the dip of the adjoining gneiss rock, which is to the 

 southeast at an angle of about 60°. 



Northwest of these several workings of the Mule Mine, and 

 higher up the hill, we meet with another set of short, lenticular 

 outbursts of the ore, wrought by the name of the Cannon Mine. 



The greatest v/idth of the ore in the main excavation here is 

 forty feet, caused, however, by the coalescing at this point of two 

 adjoining masses, which are elsewhere separated by wedges or 

 horses of the gneiss rock. The largest of these divisions of the 

 vein is fifteen feet across. Another somewhat oval mass, lying 

 almost in the prolongation of the one here mentioned, and only 

 separated from it by an intervening wall of gneiss a few feet 

 thick, has furnished at its widest part a nearly solid body of ore, 

 thirty feet in thickness. 



These ores smelt with facility, but produce a highly brittle, or 

 cold short, iron. 



Beyond these excavations, to the northeast, succeeds the 



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