518 Reviews and Notices o/Booh, 



of veins of lead ore intersects Laurentian gneiss. Though just 

 now abandoned, some of these are supposed to be still unexhausted, 

 and two of them are known, at one period, to have yielded a 

 great quantity of ore; one of them as much as |142 worth to 

 a fathom. The Ramsay lode belongs to a series of veins which 

 run parallel with those of Bedford, at a distance of about forty 

 miles to the north-eastward, and although the two groups cut 

 different rocks, both are probably of one age, which would not be 

 older than that of the Calciferous formation of the Lower Silu- 

 rian series." 



" Bruce Mines, Lake Huron, Montreal Mining Co^ 



" At the Bruce mines, a group of lodes traverses the location in 

 a north-westward direction, intersecting a thick mass of inter- 

 stratified greenstone trap. The strata here present an anticlinal 

 form, the lodes running along the crown of it. All of the lodes 

 contain more or less copper ore, which is disseminated in a gangue 

 of quartz. The main lode, which is worked with another of ab- 

 out the same thickness, is, on an average, from two to four feet 

 wide. In a careful examination made in 1848, about 3000 square 

 fathoms of these lodes were computed to contain about 6j- per 

 cent, of copper. The quantity of ore obtained from the mine, 

 from its opening in 1847, was 472 tons of seventeen per cent 

 The deepest working is fifty fathoms from the surface. The num- 

 ber of men employed is thirty-four. Smelting furnaces, on the 

 reverberatory principle, were erected at the mine in 1853 ; the 

 fuel used in these was bituminous coal imported from Cleaveland ; 

 but after a trial of three years, the Company themselves ceased 

 smelting, and subsequently leased their smelting works to Mr. H. 

 R. Fletcher. At present, the ores are in part sent to the Balti- 

 more market, and in part to the United Kingdom. — Huronian^ 



" Wellington Mine, Lake Huron, West Canada Mining Co." 



"The lodes of the Wellington Mines are probably a north-west- 

 ward continuation of those of the Bruce Mine. They are of the 

 same general character, some of them occasionally reaching a 

 thickness of ten feet. They occur on the ground of the Montreal 

 Mining Company, from whom they are leased by the West Can- 

 ada Mining Company at a royalty, and continue in the adjoining lot 

 called the Huron Copper Bay location, where they are worked by 

 the same Company. The quantity of ore obtained by this Com- 

 pany, from the Wellington mine, since 1857, is a little over 6000 

 tons of twenty per cent. In 1861, the quantity was 1175 tons of 



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