eralization in some parts is exclusively pyritic, in other parts galena-sphaleritic, and elsewhere composite. ... The detailed descriptions, though confined mainly to the 1, 100-foot and Argo tunnel levels, serve to illustrate the general character ofanbsp;...
|Title||:||Economic Geology of Gilpin County and Adjacent Parts of Clear Creek and Boulder Counties, Colorado|
|Author||:||Edson Sunderland Bastin, James Madison Hill|