Geology of the Bajo de la Alumbrera Porphyry…
The Bajo de la Alumbrera porphyry Cu-Au deposit, Argentina, is in the eastern early veinlets, including A-type quartz, which are truncated by the next later por- Much Cu-Au mineralization, however, has been overprinted by late alteration, re- biotite zone. Scale = 0.2 mm. Arroyo Ron, 460 m S47W of primary crusher.