GEOLOGr OF MOOSE RIVER GOLD DISTRICT — WOODMAN. 43 



this classification, but it includes by far the larger number. Of 

 the radial type Moose River has none. Of the other class it has 

 several, three of some size. The evidence for these, and the 

 character of the dislocations, are detailed below. 



The direction of motion along the fault plane, and the posi- 

 tion of each block with reference to the adjacent ones, are 

 difficult problems because the data are not at first glance always 

 consistent. The simple possibilities in any case may be grouped 

 under four heads : — ( 1 ) vertical motion, the east side rising 

 or falling wiCh reference to the west; (2) horizontal motion, the 

 east going north or south ; (3) oblique sliding, the east going up 

 or down and north or south. These are all motions of 

 mere translation. There may have been (4) a shearing, upon a 

 fulcrum within or without the field. More than one of these 

 possibilities may be fulfilled in a single fault, and the whole may 

 be complicated by compression of the strata, equalized or differ- 

 ential. These conditions must be examined for each fault in the 

 light of the distribution of dips shown by strata, leads, and axes 

 of folds. 



West fault : course. — This fault has been visible in the west 

 stope of the Big North lead, and obscurely at the west end 

 of the quarry to the north. In tracing out the BigNorth lead it 

 was lost at the break, and was thought to have been recovered 

 on the west side, twelve feet south. I do not think, however, 

 that it has been found, and this opinion is shared by most 

 of those who have worked the lead. At this point, therefore, 

 the horizontal displacement is an unknown distance, quite cer- 

 tainl}'- not much beyond twelve feet. In the west stope of the 

 Big North, the fracture dipped 85° E. Whether this is charac- 

 teristic of the fault as a whole there are no data for discovering. 

 From the Bruce belt, which was tunnelled west to the break, a 

 cross-cut was driven fourteen feet south, beyond the fault, 

 but without success. Hence the displacement here is at least 

 that amount. Fj-om the fault as exposed in the Big North to the 

 west end of the Bruce tunnel is S. 5° E. The position of 



