CONTENTS. 621 



CHAPTER V. The mining districts of the Boise Ridge Continued. p age . 

 Neal mining district Continued. 



Location 699 



Topography 699 



Geology 700 



The veins 701 



Black Hornet mining district 703 



Topography 703 



Geology 704 



Mineral deposits. 704 



Boise mining district 705 



Shaw Mountain mining district. 707 



Mining districts of Willow Creek and Rock Creek 707 



Location and topography 707 



Geology 708 



Granitic rocks 708 



Dike rocks 710 



The Payette formation 711 



Rhyolite. 712 



Basalt 712 



The ore deposits. 712 



General character .. , 712 



Treatment of the ores 714 



Detailed description 714 



Silver deposits .. 718 



Placers of the Boise Ridge 718 



Recent placers : 718 



Neocene placers 719 



APPENDIX: The fossil plants of the Payette formation, by F. H. Knowlton. 721 



Systematic enumeration of species 721 



Discussion of the flora and its bearing on the age of the beds 735 



