The Arizona Geological Survey has just published a geological evaluation on the new Santa Cruz Valley Natural Heritage area in southern Arizona. Here is the introduction from AZGS:
The newly designated Santa Cruz Valley National Heritage Area includes ~ 3,600 square miles (9,378 square kilometers; 2,304,000 acres) and hundreds of mines distributed in 20 mining districts in Pima and Santa Cruz Counties. AZGS just released a preliminary evaluation of metallic and industrial minerals of America’s newest National Heritage Area.
The report is accompanied by six figures, two tables and citations for more than 50 published geologic reports and maps from the AZGS and the US Geological Survey. All of which are available as free PDF downloads.
Citation: Pearthree, P.A. and Conway, F.M., 2019, Preliminary evaluation of mineral resources of the proposed Santa Cruz Valley National Heritage Area, Arizona. Arizona Geological Survey Open-File Report OFR-18-03<http://repository.azgs.az.gov/uri_gin/azgs/dlio/1911>;, 7 p.
My comment: It is yet to be determined if designation of a heritage area will have any detrimental effects on mining and mineral exploration. Mining has long been a part of the heritage of this area.