344 NEW YORK STATE MUSEUM 



siderable quantities have 10$ or more of this mineral. This variety 

 is called " red ore " and is of course avoided. This especial richness 

 in apatite is interesting when compared with the investigations of 

 D. H. Browne, on the distribution of phosphorus in the Ludington 

 mine, Menominee District, Mich. (Trans. Amer. Inst. Min. Eng. 

 XVII 616). Between the Old Bed and the Miller, there is a long 

 pod of this red ore, which is separated from the Miller by a trap dike 

 for its greatest part, but which runs into the Miller at its north- 

 ern end. 



The Miller bed has an axis that runs about SL 30 W, but it pitches 

 at a higher angle than the Old Bed and in the northerly portion 

 has a quite steep westerly dip, corresponding closely with the 

 Welch Shaft bed. The inclination of the skipway is about 40°. To 

 the southwest along the line of the axis it lies quite flat from east 

 to west, but it has one notably steep drop on the pitch. This is 

 indicated by the different altitudes of the several sections of this 

 bed. Thus from DD to EE, it has pitched 200 feet, and a large 

 part of this is in the one roll just mentioned. The breasts varied 

 from 10 to 100 feet. 



Mine 21 is the largest of all and has a magnificent ore body, 200- 

 300 feet perpendicularly between walls. It has the general north- 

 west course for its axis, while the pitch is not to be easily,- if at all, 

 determined. The dip varies from being nearly south and very flat 

 in the Tefft shaft extension to an increasing steepness around to the 

 eastward and to an increasingly eastward dip. The skipways, which 

 are nearly parallel to the foot wall, run down at about 60°. The ore 

 body seems to lie on the southeast side of a doming anticline. 



The "fifth bed or mine is the Bonanza- Joker, lying south of the 

 others, and not outcropping. It is an extension of " 21," for the 

 workings are now approaching each other and a hole has been 

 bored through. (Section AA.) The axis of the Bonanza runs south- 

 west as do the others. The bed is a double one, as it splits between 

 the Bonanza and Joker shafts into two, over and under. A great 

 horse of rock comes in, but each portion forms a noble ore body, 

 the upper being 100' thick and the lower 65' as mined. 



Still another thin ore body has been lately shown by the diamond 

 drill south of the Joker, and a hole in the footwall of the Joker has 

 revealed a vast additional thickness lying lower. The map with 



