There are no ages for Gold at St. Gothard Quartz Mine (Helvetia Quartz Mine; Helvetia Mine; Helvetia Qtz.; St Gothard Qtz; St. Gothard Consolidated Mine; St. Gothard Cons.), Delhi - St. Gothard Consolidated Mine (Delhi - St. Gothard Mine), Columbia Hill, North Columbia District (Columbia Hill District), Nevada Co., California, USA