216 REVIEWS THE ECONOMIC MINERALS .OF CANADA. 



stations m which they occur. The arrangement has reference to the 

 uses of the objects, and is exceedingly -well-fitted to enable practical 

 men to ascertain where what they may want is to be found. The 

 following are the heads under which the mineral products are arranged ; 

 and the notes, of which we shall give a specimen or two, give infor- 

 mation scientific as well as practical, useful, and precisely of the kind, 

 we should suppose, which would be found most valuable. 



1. Metals and their Ores. 



2. Minerals applicable to Chemical Manufactures. 



3. Eefractory Minerals (for resisting fire). 



4. Minerals applicable to Common and Decorative Construction. 



5. Grinding and Polishing Minerals. 



6. Mineral Manures. 

 T. Mineral Paints. 



8. Minerals applicable to the Fine Arts. 



9. Minerals applicable to Jewellery. 

 10. Miscellaneous Minerals. 



The following is the note on the Bruce mines, Lake Huron : — 



" 2, Bruce Mines, Lake Huron Montreal Mining Co., Montreal. 



" a. Yellow and variegated sulphuretes of copper, from the lode. 



" i. " " " rough dressed. 



"c. " " « jigged. 



" d. Rough waste from jigging on copper bottom sleeves. 



" e. Plans of the mine, by Mr. C. H. Davie. 

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

 westward direction, intersecting a thick mass of interstratified 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 about 

 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 com- 

 puted to contain about 6-J per cent, of copper. The quantity of ore obtained 

 from the mine, since its opening in 184*7, is stated to be about 9000 tons of 

 eighteen per cent. The quantity obtained in 1861 was 472 tons of seventeen 

 per cent. The deepest working is fifty fathoms from the surface. The number 

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

 ciple, were erected at the mine in 1853 ; the fuel used in these was bituminous 

 coal imported from Cleveland ; 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 Baltimore mar- 

 ket, and in part to the United Kingdom. — Huronian." 



"We next give a few notes on marbles, a subject of great and in- 

 creasing interest : — 



