THE PAUNGDAW GROUP. 3Q3 



dome of the granite and separated from it by a few feet of normal 

 argillites. The evidence that the Widnes veins " make and break.*' 

 or, as it is more usually termed, " consist of a series of long, over- 

 lapping lenses," is irrefutable and excellent examples of this structure 

 are to be seen on the mine. 



Steel Bros.' Paungdaw. — Adjoining Widnes on the south is the 

 Paungdaw mine of Messrs. Steel Bros. & Co., Ltd., which was 

 purchased by the firm from the former owners, Messrs. Martin 

 and de Paulsen, in 1916. It has produced as follows :— 



Tons. 



1916 '<"> 



1916 184 



1917 . s 188 



1918 168 



The concentrates contain only about 1 per cent, of metallic 



tin. 



The main eastern boundary of the granite crosses the north- 

 eastern corner of the concession. The rest is made up of granite 

 with patches of residual sediments on Thayetngok Taung in the 

 south-western corner and a thin layer on Ashetaung. At least 

 10 important veins are worked. They are all approximately parallel, 

 strike north 18° west, south 18° east and dip at high angles to the 

 east. The larger veins were commenced as open cuts and then 

 continued as underhand stopes. Development work consists of a 

 deep level crosscut which it is proposed to carry right through the 

 Ashetaung in hard granite, and various exploratory winzes sunk 

 on the more important veins. The compressed air plant comprise* 

 a 45 h. p. Campbell oil engine driving a Sentinel compressor. The 

 veins of this mine appear to have suffered more from faults and other 

 movements during and after the consolidation of the granite than 

 is usually the case in the Paungdaw region. Horizontal fractures 

 occur too, which show themselves as steps on the steep eastern side 

 of ' he granite ridge overlooking the valley. There is much ev'denee 

 of shearing and squeezing movements in the veins themselves and 

 a great development of greisen. Pyrite occurs in large quantities 

 in the deeper portions and is responsible for the staining of the 

 quartz nearer the surface. Green fluorite has been found in small 

 amounts. The surface deposits were of considerable extent and 

 have yielded large quantities of concentrates : they are treated by 

 ground-sluicing methods, water being brought for this purpose 

 from streams 6ome distance away by ditches, flumes and a syphoc 



K 



