THE STNB0-S1NMA ttROTiP. 285 



Fowle's Yawmcmt.— About a mile and a half to the east of the 



granite exposure in the Peneichaung hill (Crisp's Concession), the 



Yanmazu lease of Mr. T. Fowle is situated. Originally granted 



as a licensed area for prospecting in 1912. it is now held under a 



mining lease covering 293 acres for a period of 30 years from 1911. 



Its production has been as follows :— 



1 Tons. 



1012 > .... 4 



1913] ' . 



1914 



1915 





 1915 



1917 »J 



1918 



The workings are situated on the slopes of a hill built up of 

 argillites of the Mergui Series and most of the production comes 

 frcm a series of thin quartz veinlets carrying both wolfram and 

 eassiterite, which strike north 18° west, south 18° east and have 

 a' vertical' dip. There are also a few longer veins which strike 

 further to the west of north. In 1917 the mine was worked by the 

 Rangoon Wolfram Co., Ltd., who adopted open-cut methods on a 



huge scale. 



Detrital deposits occur on the hill slope below the vein zone 

 and there are old tin streaming works in the valley of the Pauktaing 

 at the foot of the hill. 



Fowle's Yanmazu North.— The main vein system of Yanmazu 

 crosses over the Pauktaing into the next concession of Yanmazu 

 North, where however it has failed to yield much ore. Of more 

 interest is a large vein in another part of the same area which has 

 the distinction of having furnished the first specimens of seheelite found 

 in situ in the. district. It is about 2 feet in thickness, strikes approxi- 

 mately 20°— 25° west of north-east of south and has a high dip 

 towards the west, It consists of a very dense and hard quartz 

 containing acicular wolfram together with some seheelite. The. wol- 

 fram is fine and very evenly distributed in the vein-stufi. The 

 seheelite is white to light yellow and occurs between the quartz 

 crystals which make up part of the vein. 



The Sinbo-Sinma Massif. 

 There is a certain amount of mineralisation about the border of this 

 great granite massif some five to seven miles north of Hermyingyi, 



