ILLUSTRATIONS. 1 7 



Page. 

 FIG. 28. Sections showing the structure of the Valley View veins 131 



29. Cross sections of the Valley View vein 133 



30. Vertical section on plane of Siebert and Valley View shafts 134 



31. Cross section of veins in Stone Cabin workings 135 



32. Sketch of vertical cut on the east wall of the Silver Top 120-foot level, 3 feet south 



of main vein, showing splitting and reuniting of a minor vein 136 



33. Horizontal plan of veins in Valley View and Stone Cabin workings on the plane 



of the Mizpah 200-foot level, to show the probable connection between the chief 

 veins on the two sides of the Valley View fault 138 



34. Plotting of the strike of the faults in the Fraction workings 141 



35. Horizontal plan of vein and faults on the 237-foot level, Fraction No. 1 workings.. 142 



36. Horizontal plan showing vein and faults on the 300-foot level, Fraction No. 1 work- 



ings 142 



37. Horizontal plan showing veins and faults on the 400-foot level, Fraction No. 1 work- 



ings 143 



38. Stereogram showing nature of movement along the main northeast faults in Frac- 



tion No. 1 workings 144 



39. Cross section of Fraction No. 1 vein 145 



40. Horizontal plan of veins and faults exposed on the 300-foot level, Fraction workings, 



showing the relation of the vein fragment in the Fraction No. 2 to the vein on 



the corresponding level of Fraction No. 1 147 



41. Hypothetical vertical cross section of the Valley View vein system before faulting 



and erosion 151 



42. Plan showing outcropping veins near the Wandering Boy and their probable rela- 



tion to the veins encountered underground 153 



43. Vertical section on the Wandering Boy shaft, showing the main Wandering Boy 



fault 154 



44. Horizontal plan of 115-foot level, Wandering Boy workings, showing minor vein 



and Wandering Boy fault 155 



4o. Vertical section along east drift, 300-foot level, Wandering Boy mine, showing fault- 

 ing of vein 155 



46. Vertical section along south drift, 300-foot level, Wandering Boy mine, showing 



faulting of vein 155 



47. Vertical section showing short crosscut to east near south end of south drift, 300-foot 



level, Wandering Boy, showing faulting of vein 155 



48. Horizontal plan of Wandering Boy, 300-foot level, showing fragments of vein and 



cross faults, with the general trend of equal displacement 156 



49. Stereogram showing the results of cross faults equally spaced and of equal throw . 157 



50. Diagram showing horizontal plan of equal and equally spaced faults belonging to 



two systems intersecting at right angles 158 



51. Diagram showing course of line of equal faulting for two systems of faults intersect- 



ing at right angles and having uniform displacements, the spacing being uniform 

 within each system but different for each system 159 



52. Diagram showing the diverse courses of lines of equal displacement which are the 



result of two systems of equal faults intersecting at right angles but unequally 



spaced 159 



16843 No. 4205 '-> 



