340 NEW YORK STATE MUSEUM 



are slabs with calcite, and one superb octahedron of magnetite, that is 

 nearly symmetrical and perfect. A few quartz crystals also occur. 

 The Barton Hill mines as later noted yield a greater variety. 



The Barton Hill Group. The highest outcrop of ore at Barton 

 Hill is as much as 400' above the highest of the Mineville Group. 

 Measured across the strike (Section CC) it is about 300' between 

 corresponding points, and there is at least 500' of rock section in 

 the interval. The dips show a fold to intervene, and allowing for 

 this the distance 500' is given. It is also possible that there is 

 faulting and this is suggested by the steep slope of Barton Hill, 

 resembling as it does a fault-scarp. The outcrop of the beds at Barton 

 Hill is long, being over J of a mile. It is shaded in on the 

 map. The general southeasterly pitch for the axes of the lenses is 

 also well shown by the map and is notably parallel to those of the 

 Mineville group. 



This belt has been exploited over nearly the whole of the out- 

 crop but all the output is not equally good. The deepest workings 

 are at the 2s"ew Bed where the slope has followed the chute down 

 over 2000 ft. The beds are not as thick as in the Mineville Group a 

 They range about 8', with 20' as a maximum, and are quite irregu- 

 lar. In places three beds have been met, as at the Kew Bed. The 

 Lovers Hole exposed but two but one was very thin, (See Figure in 

 paper by Mr John Birkinbine, Crystalline Magnetite in Port Henry 

 Mines, Trans. Araer. Inst. Min. Eng. Feb. 190. Yol. XVIII), and 

 the other thickened to a large body of extraordinarily pure and rich 

 ore. 40,000 tons of the run of the mine gave 68.6 Fe. As the 

 map shows, the workings are quite irregular all along the belt and 

 much exploration is necessary to keep them well in hand. The con- 

 tinuation to the north appears to be broken beyond the Little 

 Orchard Slope, and a barren piece comes in. The ore, doubtless 

 from the same belt, reappears in the Fisher Hill Mines and their 

 northerly extension, the Burt Lot. In the last named there are two 

 beds separated by about 50 ft. vertical thickness of rock, although 

 much more across the surface from slope to slope, as the dips are 

 flat. The dip at Fisher Hill is about 25° southwest as measured on 

 the skipway. This flattens out in the northerly openings to 22° £ 



In the Burt Lot Mines the dip is about 25°. These latter are in 

 Elizabethtown. The break between Barton Hill and Fisher Hill 

 may be due to a fault or eroded fold, but the lack of outcrops pre- 



