Ages for Chalcocite at American Boy Mine (Lost Horse; Rhode Island; Down #1 & #2; Albert Gross; Fraction; New York; American), Piper Gulch, Mansfield Gulch (Mansfield Canyon), Temporal Gulch, Wrightson District, Santa Rita Mts, Santa Cruz Co., Arizona, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 68.4Ma - 65.4Ma at this locality