Save the Scenic Santa Ritas

Fighting to protect the Santa Rita and Patagonia Mountains from the devastating impacts of mining.

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Air Quality

Air Quality and Climate Change

Corresponding pages in the DEIS:
Summary of Impacts: pp. 158-205; Environmental Consequences: pp. 177-205

Under the proposed action, particulate matter 2.5 (PM2.5) would increase by two times versus background levels, and particulate matter 10 (PM10) would increase by more than three times versus background levels. National Ambient Air Quality Standards for particulates would not be exceeded, but those for PM10 would be close to exceedance (97 percent of standard). Volatile organic compound emissions would be about 105 tons per year and would represent less than a 1 percent increase in Pima County. Nitrogen oxide emissions would be about 1,250 tons per year and would represent a 4 percent increase in Pima County; this would increase the risk of an exceedance of the ozone air quality standard in the Tucson area. Sulfur dioxide emissions would meet the air quality standard at the project site. Greenhouse gas emissions (carbon dioxide) would represent a 1 percent increase in Pima County. Emissions from the project would cause and contribute to degradation of visibility in the Saguaro Park East and Galiuro Wilderness Class I airsheds.

Rosemont Copper has committed to using numerous mitigation measures to minimize emissions and their impacts. These include: operational and engineering controls for controlling fugitive dust associated with the tailings, water sprays and wet scrubbers associated with the ore crushing; use of covers to control emissions from mix tanks and settlers used in the solvent extraction system; spray or physical enclosures for low emission potential processes; location of stockpile and loadout areas within the enclosed stockpile building; use of newer engine designs in mobile sources, dust control on access, haul, service, and maintenance roads; use of low-sulfur diesel fuel onsite for all stationary equipment; expedited construction of electrical lines to reduce the need for onsite power generation and associated emissions; design of the project administration building to showcase use of leadership in environmental and energy design and sustainable energy concepts; and application of acid leaching solution to the heap using emitters (similar to drip irrigation) to avoid aerosol losses to the wind.



Impacts to Air Quality

The area currently has excellent air quality. Tailings and waste piles will be sources of dust, which prevailing winds will blow toward residential areas. Air quality in the National Forest and surrounding residential areas will be degraded by both dust and truck exhaust associated with mine operations.

As a case-study, consider the problems Pima County has seen with the Asarco mine in Green Valley: http://www.gvnews.com/articles/2010/01/21/news/59county%20dust%200110.txt

Recent Posts

  • Litigation Schedule February 17, 2021
  • Links to recent news and letters – 2021 February 15, 2021
  • Links to recent news and letters – 2020 December 31, 2020
  • Long Mountain – a film by Leslie Epperson July 8, 2020
  • A major win for endangered species in the Santa Ritas February 13, 2020

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RSS Latest from Rosemont Mine Truth

  • Pima County reaffirms resolution opposing Rosemont Mine April 19, 2019
  • Hudbay approves $122 million spending plan for “early works” at Rosemont March 29, 2019
  • Hudbay seeking Rosemont Mine joint venture partner after receiving key federal Clean Water Act permit March 15, 2019
  • Hudbay has failed to provide legal justification for Clean Water Act permit, Natural Resources Committee chairman says March 5, 2019

Selected Lens on the Land Photographs

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Litigation Update

Speaking of which (the appeal originally filed in Nov. 2017 challenging the Forest Service’s approval of the mine), we now have a schedule for that case in the 9th Circuit Court of Appeals – not definitive, but at least a general time frame:

 

After a lot of negotiating, the lawyers have come to an agreement on the final schedule of our cases before the 9th Circuit Appeals Court. Here is the updated schedule:

  • Feds opening brief due by 1 June 2020
  • Hudbay opening brief due by 15 June 2020
  • Then, our response by 3 September 2020
  • Feds optional reply brief by 2 November 2020
  • Hudbay optional reply brief by 9 November 2020

Click here for more updates

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