There are no ages for Quartz at American Quartz Mine (American Qtz; American Claim), Spanish Quartz Mine (Spanish Qtz.; Spanish Mine; Spanish Mng. & S F Com. Co.; Spanish Mng. & S F Commercial Co.; American Claim; Spanish Claim; Santa Anita Claim; Santa Anita Extension Claim; Pine Tree Claim; Singleton Claim; Grizzly Claim; Savage Claim; , Washington, Washington District (Omega District), Nevada Co., California, USA