THE TTERMYTNT.YT QHOTJP. 287 



situated is made ap of B peculiar porphyritic granite, probably 

 a chilled margin showing Huidal structures in a plastic, cooling 

 magma, with a capping of black and white tine-grained qnartzitc. 

 The deposits are worked by monitors. 



The contact of the Sinbo-Sinma granite witli the Mergui Series 

 follows a course parallel to the ll'tantalon dialing for some distance, 

 and a number of veins, usually with a strike east of north ami west 

 of south, are known in the streair valley. They are worked in the 

 concessions of Mahomed Adam. Ma Ohein ami Tug Kyi IV. 



The Hermyingyi Ixttu^toxs. 



In the five miles of hilly count rv built up of rocks of the Mergui 

 Series, separating the southern edge of the Sinbo-Sinma mass from 

 the northern end of the Central Range, there are at least five small 

 separate granite exposures which break through the overlying 

 covering. 



Ma Chem's Thitkado. — The workings of Ma Chein's Thitkado 



mine are situated on two of these. The original prospecting license 



was issued in 1911, followed by a mining lease in 1915, Output has 



been as follows : — 



Tons. 



1913 



1914 



1915 



1916 



1917 



1918 # 



The concentrates average 25 per cent, of tin oxide. 



The workings are divided into three districts. oi&.: — Kadan 

 Taung, Taung Thit and Mvai-ni Taung. 



On the Kadan Taung. according to Mr. .7. Thomas. Govern- 

 ment Minim' Engineer, two veins strike east-north-east and west 

 south-west and dip about 30° to the 30Uth-SOUth-east, Other small 

 veins are known on the Taung Thit section, but both this and the 

 Kadan Taung are more important by reason of their detrital deposits 

 than of the veins themselves. The Mvai-ni Taung district is, 

 according to the same authority, the most promising section of the 

 mine and the four parallel though thin veins which it carries are 

 regarded as the continuation of the northern Herm\ ingyi group. 

 They have been proved over a strike extension of 100 feet. The 



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