GEOLOGY OF MOOSE RIVER GOLD DISTRICT — WOODMAN. 29 



South from Moose River, at least one anticline intervenes 

 between the mines and the edge of the upper formation ; and 

 calculation based upon that traverse is rendered still more 

 uncertain by the scattered distribution of such outcrops as are 

 structurally valuable. 



Details at " West Mine." — It is at "West Mine" that the 

 union of the two anticlines occurs. This region contains, besides 

 two or three natural exposures, two trenches and several shallow 

 shafts. The location of the axis before and after branching, and 

 of the openings, is shown in pi. 1, fig. b. On areas 187 and 188 

 the rocks show no sign of a double axis, where visible. By esti- 

 mate, tlie farthest point west at which the two axes should be in 

 the least separate, is 64 feet west of the east side of area 189, 

 and 156 feet south of its north end. As a matter of fact, there 

 must be a zone eastward for some hundreds of feet, in which 

 the division is accomplished, and before it can be said that there 

 are two distinct axes. The few natural exposures are some- 

 what disturbed, but farther east two axes are plain. 



The data at West Mine are not so full as in the settlement. 

 The only sources of continuous observation would be trenching 

 across the strike and cross-cutting underground. The two 

 trenches already referred to were in disuse at the time of my 

 study, and gave only intermittent views of the bedrock. The 

 " surface " or drift varies in depth from one foot up to eight or 

 ten. The north end of the northern trench lies in area 214, six 

 feet east and 94 south from its northwest corner. The rocks 

 here have a high north dip, but were not well exposed in 1899. 

 The cut runs 77 feet S. 25° E., to a lead. South of this lie two 

 or three feet of compact quartzite, with a smooth contact; then 

 fourteen feet of dark slate interspersed with siliceous layers, 

 ending against more whin with a " rolling " or corrugated foot- 

 wall contact. These last strata strike N. 80° E. and dip 64° N. 

 The same attitude is found 29 feet south, where the rock has 

 been trenched for many feet along the strike to expose a bedded 

 vein. Thirty-three feet south again is the north end of an eight- 



