ILLUSTRATIONS 



, . . follows.... 4 



Plate I.— Surface geological map ^ 



II -Vertical cross-section of Prospect Mountain tonows .... 



III.-Elevation and plan of contacts of Ruby Hill mines follows • • • • ^ 



IV.— Ideal section of -Ruby Hill ' 



V— Vertical cross-sections Nos. 1, 2, 3, and 4 



„ _ faces JO 



VI —Vertical cross-section No. 5 



.. „ follows JU 



VII.— Vertical cross-sect ion No. b 



, T _ tollows JU 



VIII.— Vertical cross-section No. 7 



IX.— Vertical cross-section No. 8 



, T n follows A* 



X Vertical cross-section No. y 



v. , n follows 32 



XL— Vertical cross-section No. 10 



. , „ ,, follows •'■- 



XII.— Vertical cross-section No. 11 



XIII.— Horizontal sections Nos. 1, 2, and 3 



XIV.— Horizontal sections Nos. 4, 5, and 6 ° 



XV.— Ideal faulting of the two shale belts aces 



XVI.-Projection of the hanging wall of the Ruby Hill fault faces .... 40 



FIG. 1.— Relation of the formations to the main fissure 



2.-Plan of main drift and cross-drift 600-foot level, Richmond mine ™ 



3.— Position of cupels in muffle 



4.— Position of cupels in muffle 



144 



5.— Electric curve 



144 



6.— Assay curve 



...... 14b 



7 —Illustration of electrical activity 



154 



8.— Set of timbers 



loo 



9.— Richmond framing 



10.— Eureka framing fix)*" 



