1847.] Jissociation of Geologists and JSTaturalists. 197 



shaft in the valley; E, shaft which struck the large mass of ore, 

 and which was pursued to the northeast. D, shaft by the side of 

 the .27 foot dyke, but no ore was found; 1, 2, 3, 4, 5, east and 

 west dykes; + centre of the valley. 



We may now inquire, how we may rationally explain the seve- 

 ral apparent veins a, a', a", &c. Some, no doubt would regard 

 them as lean, isolated veins, distinct and perfect in themselves. 

 But may we not rather regard them as one vein; or perhaps two; 

 on the supposition that the vein w^as folded, or bent at the time 

 the hill was broken off from the valley. The dip, though not 

 perfectly uniform, still favors this view; at 4, it dips steeply to 

 the west ; at a"' it dips moderately to the east or northeast. There 

 are some indications that there are two veins in close proximity; 

 but it is a point not yet satisfactorily settled. At any rate, we 

 are disposed to adopt the idea that all the ore upon the hill be- ' 

 longs mainly to one vein, which has been folded partly upon it- 

 self. It seems at any rate to be a view worthy of consideration. 

 That a fracture has separated these masses from those of the val- 

 ley, we are inclined to believe no one will doubt. 



The dykes are numerous at this mine, they are encountered at 

 D, and at all the shafts; at D it is 27 feet thick, and forms a 

 steep offset on that side of the valley, and may be traced east jand 

 west nearly half a mile. 



The question now comes up, is it probable that sufficient ore 

 can be obtained here to pay for its mining, and leave a profit to 

 the owner. 2. If so, what is the plan upon which the raining 

 should be carried on. In answer to the first question, we believe 

 it may be answered in the affirmative. This opinion rests on the 

 fact that the ore of this valley was once a continuous part of that 

 which was found upon the hill, south, and that in the valley it 

 had not diminished in thickness or quantity; but if any thing had 

 improved in this respect. It has been disturbed by volcanic 

 forces, dykes have been intruded, but these, though they breakup 

 the line which the ore or vein pursues, still do not obliterate it. 



