Air Quality Permit Update

Air Quality Permit Update

Florence Copper is requesting a minor amendment to its Pinal County Air Quality Permit. Here are the facts, and we encourage your participation in the public input process.


  • Most industrial operations in Pinal County are required to have an air quality permit.
  • Florence Copper’s air quality permit is issued through Pinal County and has been in place since 1996.
  • The permit was renewed in 2011. Permit renewals are routine.
  • There have been no permit violations.
  • A public hearing was held for the permit’s renewal on Jan. 4, 2017. Unfortunately, Pinal County’s recording device malfunctioned requiring a second public hearing, which was held on Feb. 22, 2017.

Current status

  • A prefeasibility study based on a new emissions control design was completed in March 2017.
  • The new design incorporates the latest innovations in technology, reducing emissions even further for improved air quality performance on-site.
  • Florence Copper submitted an application to Pinal County for a minor amendment to its existing air quality permit that reflects the updated air quality emission calculations and model results.

Next steps

  • Once Pinal County issues the draft Air Quality Permit, Florence Copper will request a public hearing on the draft permit.
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