THE DENSURGI GRAPHITE DEPOSIT. Ij 



developed. The graphite appears to follow the primary strike of the 

 country rock as indicated by the phenocrysts. The eastern part of the 

 deposit is best exposed. Here a mass, three or four feet high, eight 

 yards wide, and twice as long, stands out in rugged gnarled slopes 

 resembling on a large scale the forms assumed by kankar concretions. 

 It is composed of graphite and calcium carbonate, the latter in all 

 probability having been introduced and deposited by calcareous 

 waters pari passu with the removal of the gneiss substance. I am. 

 not inclined to regard the graphite-limestone rock as a primary one. 

 Though it is not possible at present to point with certainty to the 

 original composition, a graphite gneiss seems to be the most probable 

 source of the graphite. (Specimen 15' 104.) 



A partial chemical analysis of the rock showed 23 , 6o / / of carbon 

 dioxide, corresponding to 53'85°/ °f carbonate of lime. Allowing for 

 a small quantity of earthy impurity, the calcareous graphite probably 

 contains about 4o°/ of pure graphite. 



This mass is of no commercial value, but there seems to be reason to» 

 suppose that this calcareous form may be only superficial, the graphite 

 a short distance below the surface being free from lime may be 

 commercially valuable. 



West and south-west of this mass of calcareous graphite, several 

 bands of graphite of fair quality were found. 



To the west of the large mass of calcareous graphite there-is an, 

 open space several yards wide in which no important graphite outcrop 

 occurs, but in the clay banks of a ravine several exposures of graphite 

 occur. This second ravine cuts across the strike of the rocks and it is 

 probable that the graphite exposures seen in its bed represent parallel 

 graphite bands or veins following the strike of the country rock. 

 The most northerly of these bands is about afoot and a half across and 

 the largest band has a width of a yard on the eastern bank widening 

 to two yards on the western bank. The third band is thirteen 

 yards farther south. Loose blocks of calcareous graphite were observed 

 several rods farther east than the most eastern extremity of the calca» 

 reous graphite, and as this is up-stream it seems probable that there is 



