Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org

Ages for Sphalerite at Head Center Mine (Harwood Mine; Center Oil And Smelting Co.; Far Mining Enterprises; American Zinc Co.; Aravaipa Mining Co.), Williamson Canyon, Cobre Grande Mountain, Aravaipa, Santa Teresa Mts, Aravaipa District, Graham Co., Arizona, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 56Ma - 33.9Ma at this locality

Locality age (remote)

Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
sedznpb-00443	56	33.9				29785	Aravaipa District, Graham Co., Arizona, USA	Singer et al. (2009)	USGSOFR2009-1252