Some Geologic Features of the Superior Area, Pinal County, Arizona

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Date Published: 
January 1962
Authors: 
New Mexico Geological Society

Here, the topographic expression of structural features is spectacular. The north-south trending Kings Crown Peak-Apache Leap escarpment divides the area into two major topographic units. East of the escarpment is an upland capped by welded dacitic tuff. West of the escarpment, erosion, acting upon faulted basement blocks and thick accumulations of eruptive rocks, has produced a rough terrain at lower elevations. The mining community of Superior is situated in a fault-formed basin in the central part of the area. Rugged landscape southwest of Superior is commanded by Picket Post Mountain, which is an eroded volcanic vent; the remnant of a once extensive volcanic pile.

Reference Information: 

Hammer, D.H. and Webster, R.N. 1962. Some geologic features of the Superior area, Pinal County, Arizona, in Weber, R.H. and Peirce, H.W. (eds). 13th Annual Fall Field Conference Guidebook: New Mexico Geological Society, Mogollon Rim Region (East-Central Arizona).

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Temporary Contact Update

The Tonto Supervisor’s Office in Phoenix remains temporarily closed in July 2019 due to a building renovation project. As a result, questions from the media and general public regarding the Resolution Copper Project and Land Exchange should be e-mailed to John Scaggs at: john.scaggs@usda.gov

EIS Timeline - Feb 2019

  1. Proponent submits revised Plan of Operations [Sep 2014]
  2. Federal Register Notice of Intent to prepare EIS [Mar 2016]
  3. Public scoping period and scoping meetings
    [5 meetings between Mar-Jun 2016; comment period extended from 60 days to 120 days, closed Jul 18, 2016 ]
  4. Compile and review existing data
  5. Prepare project description and identify project alternatives
  6. Publish Alternatives Evaluation Report [Sep 2017]
  7. We Are Here
    Validate Baseline Information; analyze environmental effects
  8. Prepare Draft EIS
  9. Federal Register Notice of Availability of Draft EIS
  10. 90-day public review and comment period, with public meetings
  11. Respond to public comments and prepare Final EIS
  12. Federal Register Notice of Availability of Final EIS and Draft ROD
  13. 45-day Public Objection Period
  14. Resolve objections to Final EIS and draft ROD
  15. Issue Final Record of Decision

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