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



though the occurrences are of more theoretical than economic 

 importance. About I tons of concentrates rich in oassiterite have 

 been obtained during L916, 1017 and L918 from a prospect worked 

 by Osman Musti Khan. The veins occur to the north of peak 

 3,550 in the vicinity of a small patch of Mergui Bediments and they 

 strike a few degrees west of north and cast of south. The conces- 

 sion was called Sinbo-Sinma. 



Ma Sein Dairy's Sinbo-Sinma. — Further to the south and nearer 

 the edge of the granite lies Ma Sein Daing's Sinbo-Sinma mine 

 which produced 11 tons in L918 and 1(1 tons during the two pre- 

 ceding years. Here there are at least five veins in granite with a 

 general strike of 20 c to 30° north of west and south of east, two of 

 which dip southwards at angles of 65° and 70 and three of which 

 dip northwards at the same angles. The veins are irregular and 

 often thin. Horses of decomposed granite are often met with. 

 On the eastern side of the main ridge there is. according to 

 Mr. R. C. N. Twite, a very well-defined vein (Lode Xo. I East), 

 which increases in width as it is followed into the hill side. At an 

 elevation of 3,100 feet above sea level the vein is solid quartz but 

 towards its outcrop it gradually splits up into a number of quartz 

 stringers from 2 to 1 inches in width. 



Myekhanbaw. — StiU further south, and on the granite margin 

 in a southward pointing lobe of the Sinbo-Sinma massif, is the 

 Myekhanbaw mine, the property of .Messrs. Steel Bros. & Co., Ltd.. 

 who purchased it from Mr. A. B. Wallenberg. The prospecting 

 license dates from 15)10. but before that time the area was held 

 by Chew Lu Yin. Production has been as follows : 



Tuns. 

 1916 „ 



1910 7 



1917 i 8 



1918 .' 31 



The concentrates contain 17 per cent, of metallic tin. The 

 Myekhanbaw neighbourhood is to be considered more as a source 

 of tin-stone than of wolfram. Ancient alluvial tin workings are 

 numerous, especially along the Seinpyon chaung. According to 

 the local Karens these operations were conducted by Siamese Shans, 

 There are numerous small veins and st lingers on the area and it 

 is from their disintegration that the detrital deposits have received 

 their values. The part of Nalotuung on which the workings are 



