210 



TRANSACTIONS OF THE 



ness of 200 feet. Some of the balls are strong rich ore^ 

 ten or twelve inches thick, weighing 600 weight or 

 more. Specific gravity 3.999 ; weight per cubic foot 

 250 pounds ; and yielding 4850 tons per acre for a foot 

 in thickness. 



Another rich bed of ball mine occurs in Morris's run, 

 consisting of four to six courses ; some of the balls being 

 four feet and upwards in length. 



Specific gravity of this ore, 3.440. 



Weight per cubic foot, 215 pounds. 



Weight per acre, for one foot thick, 4200 tons. 



The produce of this bed might probably amount to 

 5000 tons per acre. 



The highest position, in this immediate neighbourhood, 

 in which I have traced good ball ore, is at the height of 

 420 feet above the Tioga, towards the summit of Bear 

 creek ; and the lowest is about 180 feet above the same 

 river at Coal run. Allowing for the rise of the strata in 

 that direction, the range of beds containing iron is about 

 130 feet thick, which is similar to that shown in the Coal 

 run section. 



In the stream called Saynisch's run, on the north slope 

 of Elk mountain, six miles east of Blossburg, I found a 

 seam of argillaceous ore accompanied with a thin coal 

 vein, at an elevation of 520 feet above the Tioga at 

 Blossburg ; and there were traces of coal as high as 800 

 feet above the same point. 



Hydrate of Iron^ in small quantities, has been found 

 within this basin. 



MANGANESE. 



K bed of black oxide of manganese occurs within 

 this coal region, on Elk mountain, at a height of about 

 700 feet above Blossburg bridge. Thickness not proved. 



