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between the Pequannock and Succasunny, running from the 

 northeast to the southwest, parallel with the Copperas Mountain, 

 at a distance from it of between two and three miles. The rock 

 of this region is the usual granitoid gneiss, consisting principally 

 of felspar and hornblende. The strike of the strata here, as almost 

 every where else, is to the south-southwest, the usual direction 

 of the dip being towards the south-southeast, and at high angles, 

 commonly exceeding 60°. 



A series of parallel veins, or more properly speaking, of paral- 

 lel belts of closely contiguous veins, consisting of very excellent 

 magnetic iron ore, imparts especial interest to this range. 



I shall allude more particularly to three of these belts of ore, 

 conspicuous for their length and well-developed features. Though 

 the excavations yet made are not sufficiently numerous to esta- 

 blish satisfactorily cither the independence or the strict continuity 

 of the several portions of a vein or veins occupying the same 

 line of bearing, yet the indications are, that the individual veins 

 are of considerable length, say several furlongs, but by no means 

 prolonged over the whole district. 



I incline to view each supposed long vein as made up in fact 

 of a string of several veins very nearly in a line, one commencing 

 either at or a little before the termination of another. 



As the question of their strict continuity is one of little practical 

 importance, we may venture, for the sake of present convenience, 

 to designate them as three great veins, inasmuch as they lie in 

 three separate parallel zones. From a little to the northeast of 

 Hibernia, where the larger exposures of the ore commence, to a 

 point at some distance southwest of Succasunny, where they at 

 present cease, the space over which these belts of the magnetic 

 ore have been worked, is upwards of ten miles. 



The inclination and strike of the several veins coincide, when- 

 ever they are at all regular, with that of the enclosing strata of 

 gneiss. Their direction is from north-northeast to south-south- 

 west. 



Commencing with the southeasternmost line of ore at present 

 developed, we find upon it the two mines, entitled Muir's Mine, 

 and Sweed's Mine. The next parallel belt towards the northwest 

 embraces the Hibernia Mine, Jackson's Mine, and Dickerson's 

 Mine, near Succasunny. The third range includes the Denmark 



