There are no ages for Tetrahedrite-(Zn) at Silverfalls - Chicago Consolidated Mine (Chicago Claim; Silver Falls Mine; Chicago Consolidated Property; Pillchunck Claim; Union Claim; Cold Spring Claim; Richmond Claim; Madison Claim), Igo (South Fork), South Fork Silver District, West Shasta Copper - Zinc District, Klamath Mts, Shasta Co., California, USA