68 HATCH : AURIFEROUS QUARTZITES OF PARHARDIAH. 



III. — Report on the auriferous quartzites of Par* 



HARDIAH, CHOTA NAGPUR, by FREDERICK H. HATCH 9 

 Ph.D., F.G.S., Assoc. M. Inst. C.E., Mining Special- 

 ist , Geological Survey of India. (With Plate X.) 



The property is situated at Parhardiah near the village of Somij, 



in the zemindary of Anandapur, Singhboom 

 Situation. . 111 



district, Chota Nagpur. It is reached by a 



country road from Manharpur Station on the Bengal-Nagpur Rail- 

 way, from which it is distant some 14 miles. 



Description of the "veins". — The so-called "veins" which have 

 been prospected by the Company are in reality highly silicified beds 

 of quartzite which are associated with a series of calc-chlorite schists, 

 the whole constituting a part of the great group of Transition 

 rocks. The beds strike approximately east and west and dip at 

 an angle of 60 to 70 degrees to the north. 



The quartzite is a bluish to whitish grey rock, consisting of an 

 aggregate of closely interlocked granules of quartz. Examined 

 under the microscope, the granules are seen to be small and of 

 fairly uniform size but of irregular shape and with ragged edges. 

 Calcite occurs in the sections in patches and streaks, and here and 

 there is an occasional shred of talc. It is evident from the way in 

 which these beds are veined with small seams of secondary quartz 

 that they have formed a channel for the passage of mineralizing 

 solutions, and to this fact must be ascribed the presence of the 

 metalliferous constituents, namely, iron-pyrites and gold. 



The calc-chlorite schist consists of calcite, chlorite and magne- 

 tite. The carbonate constitutes the biggest proportion of the rock 

 and is evidently of secondary origin. The magnetite is present in 

 well-defined octohedral crystals. A small quantity of talc is also 

 ( 68 ) 



