CONTENTS. 5 
Economic geology — Continued. Page. 
Gold — Continued. 
Gold deposits 59 
Occurrence and structure 59 
Fissure veins 59 
Replacement deposits 60 
Deposits of intermediate character 61 
Mineralogical character 61 
List of minerals 61 
Description of the gangue minerals 63 
Description of the ore minerals 64 
Conclusions 65 
Distribution of the gold 65 
General features 65 
Secondary enrichment 65 
Value of the ores 67 
Genesis of the deposits 68 
Character of the solutions 68 
Source of the materials 69 
Deposition of the ores 72 
Conclusions 73 
Age of the deposits 74 
Placers 74 
Mining developments 75 
General statement 75 
Extent 75 
Methods of mining 75 
Methods of extraction 76 
Costs of production 76 
Haile mine 77 
History and production 77 
Development 77 
Geology 78 
Character and occurrence of the ore 80 
Value of the ore 81 
Ore bodies 83 
Colossus mine 87 
Brewer mine 90 
Blackmon mine 92 
Kings Mountain mine 94 
Ferguson mine 96 
Brown mine 99 
Schlegelmilch mine 101 
Thompson mine 103 
Other mines 104 
West mine 104 
Nott mine 105 
Magnolia mine 105 
Darwin mine 106 
Ross & Carroll mine. 106 
McGill mine 106 
McCaw mine . . 106 
Love mine 1 07 
Wilson mines 107 
