324 THE CANADIAN NATURALIST. [Vol. 



Vll. 



As Anticipated. As Determixed. 



Old Pewabic 148 feet. Old Pewabic 1 71 feet. 



Green Amygdaloid. . .285 " Green Amygdaloid. . .275 '< 



Albany and Boston. . .382 '' Albany and Boston. ..380 " 



Epidote or Mesnard. ..465 " Epidote or Mesnard. . 448 " 



Conglomerate 520 " Conglomerate 500 " 



To the West of the Quincy and Pewabic lode, little mining 

 has been done on the lake shore, the Hancock being the only 

 copper- bearing bed extensively worked. 



The heaviest copper lies generally near the foot wall. Through- 

 out the region the metal is classed according to its size as mass, 

 barrel, and stamp work. Mass copper is confined to the other 

 districts ; but the Quincy Mine yields a certain quantity of barrel 

 work, or copper pieces of such size that they can be separated 

 from adhering rock without the aid of water dressing. The 

 quantity is, however, small, compared with that which is scattered 

 in particles so small that machinery and mechanical concentra- 

 tion alone can separate them from their matrix. The means 

 used to effect the separation are the same in all the mills of the 

 district. 



The equipment of the Quincy Mine above and below ground 

 is excellent. The hoisting cars are of heavy boiler plate. Here 

 and at other mines the cars discharge themselves by means of a 

 very simple device. They are shaped like large coal-scuttles, and 

 run on four wheels; but on the same axle, and projecting beyond 

 the back wheels, are wheels of smaller diameter, which, when the 

 car reaches the spot where it is to be emptied, run up inclines 

 secured on each side beyond the track. Thus the back wheels 

 are lifted off the track, while the four wheels remain on the rails 

 and the body of the Waggon, tilted forward, shoots out its con- 

 tents. 



Heretofore it has been the custom in the Portage Lake shore 

 mines to calcine the rock, and thus render i-t more friable; but 

 following the example of the Calumet Mine, a hammer like a 

 pile driver has been introduced into the Quincy ore-house, which 

 reduces the larger blocks to a size suitable to the Blake crusher, 

 and for hand-picking. The ore undergoes the following treat- 

 ment. Discharged from the hoisting car, it is carried down an 

 incline to the ore-house, which is on the brink of the steep hill 

 overlooking the lake. The ore-house is provided with a hammer, 

 under which, as stated, the largest blocks, weighing often over a 



