6 CONTENTS. 



The ore deposits — Continued. Page. 



Genesis of the ores ■ 61 



Original source of material . _ _ 61 



Ore minerals 61 



GangiTe minerals 63 



Process of concentration 66 



Economic importance and future of the district 67 



Sources and uses of fluorspar . _ 67 



Future production 69 



Guides for prospecting . _ 70 



Index 71 



