THE ADIRONDACK GRAPHITE DEPOSITS 8/ 



as the Dresden amphibolite. Although the map is based upon 

 measurements secured by pacing, it is quite clear that the diameter 

 of the basin is not over 300 to 500 feet. If this is so, then the 

 amount of ore present on this property is decidedly limited. 



Amount of ore. The mine is located upon the rim of the struc- 

 tural basin. Professor Crosby, in a report upon the property, 

 remarks that the dip seems to flatten as the drifting to the south 

 continues. This is exactly what would be expected from such a 

 structure. Toward the center of the basin the dip should approach 

 zero. 



All the rocks in the neighborhood are shot through by pegmatites 

 in such a manner as to indicate that the Algoman granite is not far 

 distant. It is a possibility that it has cut off the ore bed near the 

 center of the basin. Some exploratory work in the way of trench- 

 ing along the line represented upon the map would be advisable. 

 Several well-placed diamond drill holes would settle many of the 

 questions raised. 



Let us calculate the probable amount of the ore, assuming that 

 the above inferences are facts. 



Appropriate diameter of basin, 400 feet. 

 Area of basin, 125,600 square feet. 

 Thickness of pay ore, 10 feet. 

 Volume of pay ore, 1,256,000 cubic feet. 

 Weight of one cubic foot, 168 pounds. 

 Weight of pay ore, 210,000,000 pounds. 

 Amount of available graphite, 5 per cent. 

 Weight of graphite in ore, 10,500,000 pounds or 5250 tons. 

 This, of course, assumes that not much ore exists to the east. 

 It is not certain how far it continues. In walking east from the 

 mine toward the fork in the road (" 1355 " in altitude), in the first 

 brook crossed, the Johnsburg limestone was found beneath the 

 Dresden amphibolite. Furthermore, W. J. Miller has placed a 

 little cross ( X ) upon the geologic map where the secondary road 

 crosses this same stream. This indicates limestone. The writer 

 does not know whether it is the Johnsburg or the Faxon, but it is 

 more probable that it is the former. The ore certainly does not 

 reach this far. This perhaps illustrates the practical side of 

 applied geology. 



The ore. The bedded ore of the Rowland property reminds us 

 of that found at the International Company's mine. It has been 

 affected by the Algoman granite. Below is the tabulated result of 



