5S 
FIFTEENTH REPORT. 
usually quite subordinate in amount to the tine gold, much of which may 
well be still in the form in which it was hrst deposited with the pyrite 
and quartz. Some line gold, however, is probably secondary, and there 
are cases in which the amount of secondary gold is greater than the 
amount of primary. 
There is nothing to indicate that the character of the deposits has 
been changed to any considerable degree since the glaciers cleaned away 
the surface rocks, and there is therefore no reason for believing that 
the ore will show any appreciable dependence on the present surface. 
The secondary changes which have taken place are not surface altera- 
tions. 
