280 BROWN & HERON: GEOLOGY AND ORE DEPOSITS OF TAVOY. 



The most important group of workings is situated about the 

 head of the Byindaung dialing where the country rock consists 

 chiefly of argillites of the Mergui series containing a mineralised 

 zone which may be as much as 500 feet wide. The zone is penetra- 

 ted by a series of thin quartz veins carrying wolfram and varying 

 in thickness from 1 to 8 inches. One better developed vein attains 

 a thickness of 2 feet. It is known as the •"Tank Lod '." The 

 general strike is east 15° north, west 15° south and the dip from 

 30° to 50° towards the north. There are indications of a cross 

 series striking a few degrees west of north and east of south. Mr. 

 Page in an early report on the mine wrote: — " 1 have however 

 seen an almost horizontal vein which intersected one of each of the 

 other two sets of veins. The steep veins are all sufficiently rich 

 to be working, but the horizontal vein appeared to be barren." 

 The ore channel lias been worked entirely on the tribute system. 

 The veins are followed by open cuts and short adits in the dry 

 season while the overburden and rotten rock is sluiced in the rains. 



The great Kadando vein extends into the eastern portion 

 of the lease, where it averages two feet in thickness, strikes north 10° 

 west, south 15° cast, dips towards the east at 75° and carries wolfram, 

 pyrite, chalcopyrite and pyrrhotite. 



Kyaukanya ore averages about 68 per cent. WO a and 1 per cent, 

 to 2 per cent. Sn. 



Tavoy Concession's Kadwe.—Thh mine adjoins the same firm's 

 Kyaukanya lease on the south. The first prospecting license was 

 issued in 1909 and a mining lease for a period of 30 years followed. 



The output has been as follows : — 



Tuns. 

 1913 54 



191* ll'o 



1915 107 



1916 44 



1917 



22 



1918 



The concentrates average about the same composition as those 

 from Kyaukanya. 



A system of bearing veins originally cropped out at the summ't 

 of Kadwc hill in argillites of the Mergui Series and in the earlier 

 days of the mine these were worked by deep open cuts. Thay 

 varied in thickness from a few inches to about two feet and had 

 strikes varying from north 30° west, south 30° east to north 10° 



