CONTKNTS. 



Chapter XIV. — Thf British (iuiana, Brazil avd Venezuelan Boundaries 

 Tlie British Guiana-Venezuela Boundary .... 

 The Brazilian Boundary and the Sandstone Plateau Districts 



Chapter XV. — T/ie Mazaruni River 



The Puruni River 



Chapter XVI. — The Easequiho River 



Chapter XVII. — The Potaro and Kuribronr/ Rivers . 



The Potaro River ........ 



The Kuribrong River ........ 



Chapter XVIII. — The Tiger Creek Trail (uid the Poiaro-Kunairaru 

 Road .......... 



The Tiger Creek Trail 



The Potaro- Konawaruk Road 



Chapter XIX. — The. Konawaruk River 



Chapter XX.^ — The Deinerara River 



Chapter XXI. — The Berhice River 



Chapter XXII. — Th'' Structures of the Auriferous Districts 



(a) The North- Western District . . . . . 



Auriferous Quartz Veins ...... 



(h) The Groete Creek, Cuyuni. Mazaruni and Puruni River 



District 



(f) The Essequibo, Potaro, Konawaruk and Denierara River 

 District ......... 



Chapter XXIII. — Quartz Veins and Mineralised Masses 



Quartz Veins or Reefs ....... 



North-Western District 



Cuyuni River District ....... 



The Mazaruni-Puruni District 



The Quartz Veins of the Essequibo, Potaro and Demerar 

 Districts ......... 



Gold-bearing Mineralised Masses 



The Oniai Aplite 



Mineralised Grano])hyre 



Mineralised Granitite 



Mineralised Basic Rocks ....... 



Mineralised Granitite-gneiss 



Chapter XXIV.— TZ/e Plarer Deposits 



The North- Western Goldfields .... 

 The Groete Creek and Cuyuni River Placers . 

 The Mazaruni and Puruni Placers 

 The Essequilio, Potaro and Konawaiuk Placers 

 The Potaro Placer Gravels .... 



The Konawak Cieek Placers .... 

 The Mahdia Valley Placers .... 



The Minnehaha Creek Placers .... 

 The Konawaruk River Placers .... 



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