379 



Allie island, the rock is much decomposed, giving a chloritic 

 or serpentinous mass in which native copper is found, 

 though this material has not been observed in the unaltered 

 rock. 



Gold Mines of the District. 



For about thirty years the region around Lake of the 

 Woods has attracted more or less attention on account of 

 discoveries of gold, and mining has been carried on with 

 varying degrees of success. Several very rich pockets have 

 been found, and gold to the amount of about two million 

 dollars has been recovered from the mines on this lake and 

 Shoal lake. At the present time there is little activity, 

 though the Cameron Island mine and the Canadian Home- 

 stake mine are developing on low grade ore. 



The best known mines of this region are: the Mikado, 

 with a reported production of about half a million dollars; 

 The Regina or Black Eagle mine, with a production about 

 equal to that of the Mikado; and the Sultana mine, with 

 a production estimated between seven hundred thousand 

 and a million dollars. At the time of writing none of these 

 mines are being worked. In all three the veins fill fissures 

 which cut across the contact between granite and Keewatin 

 traps. The vein material is largely quartz, but with this 

 is a large quantity of ferro-dolomite which weathers to a 

 rusty brown on exposure to the atmosphere. 



Itinerary. 



The following itinerary has been selected to show 

 characteristic examples of the different formations des- 

 scribed by Dr. Lawson. Two minor formations, the 

 carbonaceous schists and the serpentine, are omitted, as 

 they are too far distant to be reached in a trip of one 

 day. 



At the long pier near the residence of Captain H. A. C. 

 Machin is a remarkably fine outcrop of agglomerate 

 which shows large fragments of acidic rock in a paste of 

 darker, more basic rock. It has been supposed by some 

 that this is a conglomerate of water-worn pebbles and 

 boulders, but, although there is no apparent means of 

 determining the origin of this rock at this place, its deriva- 

 tion is well shown in the neighbourhood of Ash bay as 

 probably being from a volcanic breccia. 



