NILES-AUGUSTA AND WILD CAT MINES. 443 



though perhaps shallower, and a shorter anticline beyond it to the south, 

 from which the White Porphyry had not been entirely eroded off. The 

 conditions in the Waterloo Main shaft would be represented by those of 

 the dotted lines, which on Section B denote the projection of the Harker 

 shaft, and the Evening Star Lower shaft would occupy a corresponding 

 position to the No. 3 Henriett. The ideal structure outlined here necessi- 

 tates a very sudden rise in the original Blue Limestone surface to the north- 

 ward, near the Waterloo-Forsaken line, as the movement of the Carbonate 

 fiiult, which on the line of Section C is nearly 140 feet, would have 

 become nothing and even be reversed before reaching the line of Section B.^ 



Niies-Augusta and Wild Cat. — South of the Forsakeu the data to be obtained 

 from workings west of the line of Carbonate fault were still more meager. 

 The Evening Star Lower and Catalpa No. 2 shafts were both inaccessible; 

 the former was said to have found a large body of vein material and ore, 

 as shown in Section D. The latter was sunk 210 feet, and found the for- 

 mation dipping nearly 45° east. From the dump it was evident that in its 

 lower part it had passed through White Limestone and quartzite. It was 

 assumed that it had passed across the fault line and reached the lower for- 

 mations east of it. 



From the Niles shaft three levels had been run. The upper drift ran 

 east through White Porphyry and struck vein material at the Evening 

 Star line. On the second level the drifts were mainly in limestone, with 

 some vein material at the contact of overlying porphyry, necessitating a 

 steep westward dip in the formation from the contact of the upper level. 

 The lower level at 230 feet was entirely in limestone, whose stratification 

 lines could not be distinguished. The limestone in this mine was of lighter 

 color than is ordinary in the Blue Limestone. 



' Mr. Eicketts (loo. cit., p. 13) supijoses a uiucb simpler structure through the lower Waterloo 

 and Forsaken miues, namely : that the formations continue westward on their normal dip until they 

 reach the surface, there being no displacement anywhere along the assumed line of the Carbonate fault. 

 His opinion is of weight, since he had the advantage of later and more extended underground work- 

 ings and could give months of time where we could only give days. His explanation, however, takes 

 no account of the White Porphyry west of the Carbonate fault line. Assuming that he is right and 

 that our determinations of the existence of White Porphyry are at fault, some structural explanation 

 e.milar to the above is required to the south of this line before the unmistakable conditions existing 

 in the .(Etn.i-Pendery grounds are reached. 



