X CONTENTS 



Permeability of the rocks 83 



Deposition of the barite 84 



Conclusion concerning the barite 85 



The other minerals of the barite deposits 86 



The source of the minerals 86 



Transportation 86 



Deposition 87 



Deposition by rising solutions 87 



Mode of occurrence of the deposits 88 



Cavity filling 89 



Order of filling 90 



Replacement 90 



Source of the solutions 91 



Time of mineralization 92 



Corroborative evidence 93 



Mode of occurrence of barite in other deposits 93 



Similarity to shallow vein deposits 94 



Source of the barium in rising solutions .... 96 



Barite deposits of the United States 96 



Conclusion as to origin 99 



Economic Importance of the Deposits 100 



Mining 101 



Preparation of the barite 102 



Treatment at the Point Milling and Manufactur- 

 ing Company's mill, Mineral Point, Mo 103 



Uses 103 



Future of the barite industry of Missouri 105 



Bibliography 106 



