16 W. S. DUN. 



present under high prices for copper. Unless fresh bodies 

 are forthcoming to take the places of the depleted deposits 

 or unless scientific skill be brought to bear upon the treat- 

 ment of the complex ores remaining, the district will 

 become little more than a group of subarid pastoral areas. 

 It would be important to make experiments with the com- 

 plex mixture of copper pyrites, iron pyrites, galena and 

 zinc blende at the O. S. A., to see whether it has any com- 

 mercial importance as regards copper, lead, zinc, silver, 

 sulphur and flux for smelting. This deposit is supposed to 

 exceed a quarter of a million tons in amount, and is at 

 present lying idle awaiting research work. While yet the 

 richer copper ore known to be of commercial value is being 

 won, it would be important to undertake the research 

 work. The sulphur is needed for superphosphates, the 

 cinders from the roasting of the iron pyrites after separa- 

 tion from the lead and zinc would be useful as a flux in 

 smelting, if arsenic, antimony and bismuth are present only 

 in negligible amount. 



Other mines calling for intelligent study are the siliceous 

 gold ores of the Occidental, Oobar Gold and Peak Mines. 

 The Peak ores appear to be replacements along zones of 

 crush and along folded sediments. No complete conception 

 appears as yet to have been gained as to the relation of 

 the gold relationship to the complex movements of folding 

 and faulting associated with it. Attention to this area 

 within the near future would appeal to the function of the 

 trained geologist and the metallurgist rather than of the 

 old time prospector. The outcrops located by the pros- 

 pector have been worked, the field may now be examined 

 for zones of decided crush, and such zones, if found, may be 

 prospected with drilling apparatus. The research student 

 would follow the geologist. 



3. New England. — The margins of the country rock 

 alongside of the more sandy types of granite within New 



