LOCATION AND EXTENT OF DEPOSIT 



501 



appears to be about 20 feet, but in places it may be more, as in one of 

 the shafts sunk some years ago 50 feet were found and the shaft was 

 not sunk through it. This greater thickness is, however, in part due to 

 the dip of the bed, for it inclines strongly toward the west, as various 

 shafts show. It is, of course, possible that future investigations will 

 show that the deposit is much more extensive than it now appears, as 

 Doctor Hitchcock evidently supposed, but so far as we now know, it is 

 of very small area. 



Figure I. — Map of the Brandon Lignite Area. 



Contour interval 20 feet. Topography by U. S. Geological Survey. Co = Cambrian quartzite and 

 schist. Dark.area = lignite, kaolin, and Iimonite. 



Associated Deposits 



The lignite appears to be always surrounded by some sort of clay, 

 and at present the only work done in the locality is for the purpose of 

 obtaining a pure white clay, kaolin, in which when dug there is a con- 

 siderable mixture of white sand from the decomposition of associated 

 quartz rock. There appears to be a large bed of the white kaolin, but 

 clay of various shades of red and yellow also occurs. The workmen in 

 the shafts declare that white clay is always found in contact with the 



