278 BROWN & TIKRON: OEOLOCJY AND ORE DEPOSITS OF TAVOY. 



The average composition of Kalonta concentrates is about 42 

 per cent. W0 3 and 28 per cent. Sn. 



On Adit Hill there are 10 veins which are worked, varying in 

 thickness from 8 inches to more than 2 feet. They are all in granite 

 or greisen with well-defined walls. There is very little evidence 

 of faulting. Strike extensions vary from 050 feet to over 1,000 

 feet and directions from 12° to 22° east of north, west of south ; 

 the average bearing is 15° east of north, west of south and the 

 dips are all towards the west at angles varying from 59° to 70°. 

 On the East Extension hill there is a thin vein of unknown length 

 which bears 10° east of north and west of south with a dip of 70° 

 towards the west, that is to say, towards the centre of the main 

 intrusion. 



FitzhcrberCs Sinthe. — About .'5 miles to the west of the Bolin- 

 taung peak, the Sinthe tin mine is situated, not far from the east 

 bank of the Tavoy river. Operations are confined to ground- 

 sluicing the soil and decomposed overburden which is two or three 

 feet thick, and lies above soft argillites and quartzites of the Mergui 

 series on a steep hill side : these rocks arc penetrated in all direc- 

 tions by thin quartz stringers, often of almost microscopic dimen- 

 sions, but rich in cassiterite. The concentrate produced is a high 

 grade tin ore which docs not contain wolfram. Working can only 

 be carried on in the wet season when storm water is available. 

 Twenty-two tons of tin-stone were won by this method in the rainy 

 months of 1918. The proximity of the Bolintaung granite evidently 

 has a bearing on the origin of this peculiar deposit. 



Other Small Mine*. Other small mines in this neighbourhood 

 include Sein Daing's Talaingya and Dauklauk, E Zin's Talaingya, 

 the Bombay Tavoy Mining Co.'s Talaingya and Ong Hoe Kyin's 

 Talaingya. 



The Kyaukanya Peneichaung Intrusions. 



South of Bolintaung the granite disappears under its sedimentary 

 covering but it comes to the surface again a few miles further to 

 the south, along the snnie direction of strike, in the hill to the east 

 of Kyaukanya known as Kadantaung, again near Byindaung, then 

 in the valley of the Alaungmeshauug near Kadando and finally in 

 the Peneichaung hill of Crisp's concession. A glance at the geolo- 

 gical map will show that all these places are more or less on a line 

 which runs parallel to the axis of the main granite intrusion of the 



