11 



CONTENTS. 



PART 2. 



The Geology and Ore Deposits of the Tavoy District. By J. Coggin 

 Brown, O.B.E., D.Sc, Superintendent, and A. M. Heron, D.Sc., 

 Officiating Superintendent, Geological Survey of India. 



PART I. 



Chapter I. — Introduction .... 



Bibliography .... 



Chapter II. — Geology 



The Mcrgui Series . 



Granite and Pegmatite . 



Tertiary formations 



Recent and sub-recent formations 



Physical geography 



Pages. 



167 

 168 



178 

 I7S 

 184 

 194 

 106 

 198 



Chapter J 1 1. 



PART II. 



-Tungsten .... 



Properties 



Uses .... 



Tungsten minerals in general 

 Modes of occurrence of tungsten minerals in 

 Mineralogy op Tavoy district? 

 General distribution op Wolfram and cassjtkr 



Tavoy .... 



Chapter IV. 



-Structures and Characteristics op 

 Wolfram and cassiterite in granite 

 Wofram and cassiterite in aplite 



in pegmatite 



in greisen 



Wolfram and osssiterite 

 Wolfram and cassiterite 

 Veins . 



General features 



Length, strike, dip 



Composite veins 



Nature of vein quartz 



" Shoots " 



Outcrops . 



Tenor 



Cassiterite content of concentrates 



Chapter V. — Order of deposition and its economic bearing 

 Persistence in deptu ..... 

 Decomposition of Wolfram .... 

 Secondary enrh mmkxt ..... 

 Prospecting for wolfram veins 



Tavoy Deposit 



avoy 



I'E IN 



203 

 203 

 •_'(M 

 207 

 209 

 209 



225 



227 

 227 

 227 

 228 

 228 

 229 

 229 

 230 

 232 

 232 

 233 

 2:5f, 

 236 

 239 



242 

 245 

 249 

 253 

 253 



