72 GEOLOGY OF MOOSE RIVER GOLD DISTRICT — WOODMAN. 



istics of this sulphide. It has already been mentioned that this 

 mineral is never distorted by cleavage, while pyrite often is. 

 Also, the former never occurs on cleavage and slickenside planes, 

 while the latter frequently does. 



MINOR SULPHIDES. 



Pyrrhotite has been found very sparingly in the slate, bub 

 there is too little of it to assign it a definite distribution. 

 Galena occurs in the bedded leads, and has been reported from 

 slate in immediate proximity in two cases. It is uncommon. 

 Where present it occupies the interior of the lead, in both quartz 

 and calcite, and is never more than an eighth of an inch broad 

 in single masses. It does not appear to influence the distribu- 

 tion of gold. Chalcopyrite has been found in irregular masses 

 in both veins and sediments. In the latter, in several instances 

 it has been stretched along the cleavage planes into thin plates, 

 or else was deposited originally in that attitude. The former is 

 more probable, in view of the polished surfaces of these thin 

 sheets. I have never seen it in joint or fault planes. 



GOLD. 



In sediments. — Gold occurs in both sediments and veins. In 

 the former it is held most in the slates, and often as mucl\ is 

 found at a distance from the veins as near them ; but it is not 

 uniform in distribution, as shown by a large number of assays 

 made in 1899. The quartzite is not barren as a whole, however, 

 although it carries on the average much less than the slate. A 

 sufficient number of tests has never been made to prove any 

 distinct relation between the run of gold in the whin and the 

 proximity of leads. All the assays for this district were taken 

 within the general slate zone. It has not yet been determined 

 that the great mass of whin to the north carries any gold. In 

 the sediments as a whole, little of the metal is free. Almost all 

 is locked up in sulphides, even near the surface. 



In veins: special enricliinent. — In the veins, however, a 

 large proportion is free within the zone of oxidation, and a small 



