Ages for Chalcopyrite at Black Horse Mine (Black Horse Prospect), C And H Mine Group (Copper Alex Mine Group; Copper Aleck Mine Group; C & H Mine Group), Sycamore Canyon, Helvetia, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 62Ma - 56Ma at this locality