270 BROWN & HERON: GEOLOGY AND ORE DEPOSITS OF TAVOY 



to be developed during the greater part of the year, though at 

 present only the first unit of 500 H. P. has been installed. 



The water is piped direct to the mine 3 miles away and will 

 operate an impulse turbine under a working head of 2,000 feet. 

 The turbine is directly connected to a 375 k.w., D. C, generator 

 at 750 r.p.m. and 500 volts. 



The power will be used to operate a pump dredging plant, the 

 mill, and workshops, and the electric drills and separator." 



The first pontoon carries a 12-inch gravel pump connected 

 to a 180 B. H. P. motor and a 12-inch turbine pump also directly 

 connected to a 220 B. H. P. motor, this will supply 3,400 gallons 

 per minute to a monitor under a pressure of 70 lbs. per square 

 inch. 



Direct current was selected because a large speed variation 

 of the motors to suit the varying pumping heads is required, also 

 as the transmission lines are short there was no great advantage 

 to be obtained by the use of alternating current. 1 



Placer deposits of cassiterite occur on the flatter ground near 

 the shores of the Heinze Basin, and although production from them 

 has been insignificant in recent years there are large areas of ancient 

 workings. The deposits of Booth's Grant and adjoining areas 

 are now being tested systematically by boring. 



Tawig-shun-taung.—FouT miles west of Kanbauk and on the 

 eastern flank of the range is the Taung-slmn-taung mine, owned 

 by a syndicate of Mr. R. Ady and several others. The most note- 

 worthy feature of this mine is the occurrence of flat veins similar 

 io that at Medaw Kanbay. Detrital deposits are worked during 

 the rains. Although the original prospecting license was given out 

 earlier, the mine only commenced operations in 1916 and the output 

 since then has been as follows : — 



Tons. 

 1916 „. 



1917 : : : 2 , 



1918 29 



The average content of metallic tin in these concentrates is 

 about 35 per cent. 



1 R. C. Beadon (1), pp. 60-61. 



