USEFUL METM.* 



I !'. 



and the distinction l.rt \\rrn th- vein and the country rock be- 

 comes roiimn-iviiil. 



The surf ace material oonaiits of a n -dor brown quartz. Beneath 



this there is a zone of oxides carrying both gold and silver. The 

 alteration products at times reach a depth of 300 ft. or more, de- 

 pending upon the susceptibility of the original material to the 



