342 On Metallic Minerals. 



case, the quantity of the galena itself is insignificant. — 

 (Note 8.) 



All the sulphurets of lead (galenas) contain a portion of 

 silver, and where that portion is large, and consequently 

 worth extracting, they are called argentiferous, from such, 

 a large proportion of the silver of commerce is extracted. 



That ores of silver should be found in this country, is by 

 no means improbable ; its rocks are precisely those for the 

 most part in which they occur in other countries, such as 

 granite, gneiss, micaceous and argillaceous slates, green- 

 stone (primary), sienite, hornblende slate, gray wacke, 

 compact limestone, and secondary slates. They should 

 not be sought for above the mountain or carboniferous 

 limestone which, in the lower province at least, appears to 

 be the last rock deposit that has taken place. 



ORES OF COPPEa. 



Ores of copper have not been found in Canada in such 

 portions as to indicate its presence in abundance. Forming 

 insignificant veins in and coatings upon rocks, principally 

 of the trap formation, copper has been seen ; also distri- 

 buted in grainSj plates, and wires, through angular detached 

 masses of porphyritic trap. — (See 1st vol. of the Trans- 

 actions, pages 23 and 39.) 



These traces, however, together with the large detached 

 masses of native copper, which have been noticed by 

 Schoolcraft and others, as occurring in the neighbourhood 

 of Lake Superior, may lead, one of these days, to the 

 discovery and successful exploration of copper mines in 

 that section of the country. 



