BUILDING STONE. 89 



3. At the east side of the Mahanaddi, just north of the Damiida-Daling 

 boundary, tufa occurs in small quantity. 



4. Tufa was formerly worked near the end of the spur at the junction of the 

 Sibakhola and Mahanaddi. 



5. A small deposit is said to have been found within the last few months on 

 the hill side a little below the mouth of the Kuhi naddi. 



6. Near the head of the Kuhi there is a deposit from which lime has been 

 rather extensively burned within the last year or two. 



7. Tufa occurs in small quantity near the head of the Sivok naddi. 



8. It is found in considerable quantity in some of the ravines which join the 

 Riyem near the mouth of the latter, but has not been worked as yet. The Tertiary 

 rocks here are more than usually calcareous. 



9. It was formerly worked at Pashok, but the locality is now exhausted. 



10. Tufa is said to have been lately found near the head of the Kangbong nad^i 

 (west of Pashok). 



11. There are two abandoned quarries near the head of the Sim naddi (north- 

 east of Takda). The rock from which the tufa has been derived is a calcareous acti- 

 nolite rock. By following the strike of this, other deposits would no doubt be found. 



12. In the Sambul naddi (west of Damsang) there is a mass of tufa some 80 

 feet long and 20 high, with a thickness varying up to 2 feet or so. It was worked 

 some years ago when Major Lance's bangalo at Damsang was being built. There is a 

 smaller deposit about 150 yards higher up stream. 



13. Near the left bank of the Lesu, a little above the Fing or Thaffing naddi, 

 there is a mass of tufa through and over which a spring of water issues. It seems to 

 be more than a foot thick in places. 



14. In the Rumtek naddi (a small tributary of the Lesu) tufa was being quarried 

 this year from by far the largest deposit I have seen in the district. Part of it is 

 concealed by surface soil, but the portion visible is about 150 feet long by 30 or 40 

 broad, with a thickness at the side, where it was being quarried, of 8 feet. A little 

 higher up stream there is smaller deposit, and near the head of the naddi some of the 

 watercourses are lined with tufa. 



Building Stone. 



There is little demand for other building stone than rubble ; which 

 is generally procurable from the rocks nearest at hand : coarse slate from 

 the Daling beds; gneiss, which usually is easily split into conveniently 

 sized pieces; and, near the foot of the hills, the harder Tertiary beds — 

 are the varieties of stone mostly used for such purposes. 



m ( 89 ) 



