The basin's lake beds are auriferous.
This action was of economic importance, since it prevents accumulations of auriferous gravels within areas in which it operatesa fact which was proved by prospecting.
The broad gravel flood plain in this part of the basin is said to be auriferous.
Two types of mineralization exist, one type being auriferous quartz-carbonate veins with combinations of pyrite, galena, sphalerite and chalcopyrite present.
This basalt has been subjected to biotite-carbonate alteration and auriferous silicification.
In the adjacent region to the locality there are considerable non auriferous mineral deposits.
Auriferous quartz veins were subsequently found in surface exposures at the site of the current open pit.
Frequently they doubled as goldsmiths and were required to separate auriferous silver from base metal.
