THE COBALT AREA 



BY 



Wieeet G. Miller. 



CONTENTS. 



PAGE 



Introduction 52 



The Rocks and Their Relationships 59 



Age Relations of Rocks of Cobalt and Adjacent 



Areas 62 



Notes on the Rocks 63 



Keewatin 63 



The Temiskaming Series 64 



Lamprophyre Dikes and Lorrain Granite.. 66 



The Cobalt Series 69 



The Nipissing Diabase 80 



Dikes of Aplite or Granophyre 85 



Basic Dikes 86 



Paleozoic 88 



Pleistocene 89 



The Cobalt-Silver Veins 90 



Origin of the Veins 91 



Former Vertical Extension of Veins 95 



Relation of Wall Rock to Ore 96 



Ores and Minerals 97 



Order of Deposition of Minerals 100 



Mining and Milling 100 



Bibliography 100 



Annotated Guide Sudbury to North Bay 102 



North Bay to Temagami, Cobalt and Haileyburv . . 104 



