﻿184 



Canadian Becord of Science. 



Fig. 5. 



r 3' V' '<^"7' 8'" 



I 1 I I I 1 I 



mixed with pyrrhotite and rock, while in the heart of the 

 vein a large quantity of nearly pure 

 pyrrliotite almost free from copper 

 is found. The cross-section of the 

 ore-body then shows as follows : 

 rock, copper-ore and rock, copper- 

 nickel ore, nickel ore, copper-nickel 

 ore, copper ore and rock, and, finally, 

 rock again. This can be mapped 

 in the form of a curve across the 

 ore-body in a horizontal line, the 

 height of tlie curves showing the 

 ratio of copper and nickel. 



The figure does not, of course, 

 represent a cross-section of any 

 particular mine, but shows, as well 

 as can be done without figures, the 

 manner in which copper and nickel 

 are found on cross-cutting a large 

 vein such as at the Copper Clif!" 

 mine. As there is much ore inter- 

 k" 7' 8" mixed with the rocky walls, and 



Central horizontal line of matte. • i i „ i c ™ i. n i 



Vertical column = percent.^Hori- Hiauy mcludcd fragments of rOCk 



zontai^^coiumn_- distance .^^ ^^^^ orc-body itsclf, aud as cach 

 mass of rock tends to attract copper-ore, it follows that 



the ore as mined 

 shows about 

 equal amounts 

 of copper and 

 nickel. Fig. 6 

 must then be 

 taken merely as 

 a general indi- 

 cation of the 

 I I iri I I I I I 1 I I I I 1 • J- J 



Central horizontalline of matte. ^^"^J ^^^ 



Horizontal distance = distance from outside to centre of pot. f 1^ p ^^i \ n pral S 

 Vertical heiglit = per cent, of metals. '^"'-' iiiiueiaio 



occur at the Copper Clifi' mine. 



