The sedimentary rock-hosted gold and/or silver deposits of the northeastern Basin
and Range are classified into three categories based solely on their gold to silver ratio:
(1) silver-dominant [Au:Ag <1 :10], (2) gold-silver subequal [Au:Ag 1:10 to 3:1], and (3) gold-dominant [Au:Ag >3:1]. This classification shows some commonalities
within each category in trace element chemistry, ore genesis, and economics.