CONTENTS. 



Chapter 1.— Introduction 



Chapter II. — History of Gold Mining in British Guiana 

 Production of Gold in British Guiana 1884-1907 



Chapter III. — General, Physical and Topographical Features of British 

 Guiana 

 Situation and Extent . 

 The Alluvial Belt 

 The Sand and Clay Belt 

 The Hinterland 

 Rivers .... 

 Mountain Ranges 

 Pakaraima Mountains . 

 Merume Mountains 

 Mount Roraima . 

 The Kanuku Mountains 

 Imataca Mountains 

 Ranges and Mountains of less Importance 



Chapter IV. — 2'he Counties, Towns and Settlements of British Guiana 

 The Population of British Guiana 

 The Climate of British Guiana . 



Chapter V. — General Geology .... 



The Coast Lands . . . 



The Forest Lands and the Residuary Deposits 

 The Sandstones and the Diabase Intrusions 

 Granite ........ 



Quartz-porphyrites, Porphyries, Felsites, Porphyroids and 



Sericite-schists . 

 The Gneissose Rocks . 



('hapter VI. — 7V;e Petrography of the Fundamental Gneissose Comph 

 The Gneiss .... 



Aplite-gneiss 

 Granitite-gneiss . 

 Hornblende-granitite-gneiss 

 Epidote-granite-gneiss ...... 



Granitite-gneiss altered by Dykes of Basic Rocki* 



Basic Rocks . 



Diorite- gneiss 



Biotite-schist 



Muscovite-schists . 



Pyroxene -gneiss . 



Pegmatite 



Chemical Composition of the Gneiss 



PAGE 

 1 



9 

 9 

 9 



10 

 10 

 11 

 14 

 14 

 15 

 15 

 16 

 16 

 16 



17 



18 

 18 



19 



19 



20 

 22 

 25 



25 

 26 



.30 

 30 

 .31 

 .31 

 33 

 35 

 36 

 36 

 37 

 37 

 38 

 38 

 38 

 39 



