Resolution Copper

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Resolution Copper, (RCM), is a joint venture owned by Rio Tinto and BHP Billiton formed to develop and operate an underground copper mine near Superior, Arizona, U.S. The project targets a deep-seated porphyry copper deposit located under the now inactive Magma Mine. Rio Tinto has reported an inferred resource of 1.624 billion tonnes containing 1.47 per cent copper and 0.037 per cent molybdenum at depths exceeding 1,300 metres (0.81 mi).[1] This is one of the largest copper resources in North America.[2]

Pictured is an overview of Superior, Arizona, looking eastward and the site of the proposed mine. The access shaft is the white dot on the Apache Leap escarpment on the south rim of Queen Canyon above town. The subsidence area would be to the southeast and would include the popular Oak Flat campground. In the distance are the copper mines of the Globe-Miami mining district.

Mining method[edit]

The mining method planned to be used is block caving which creates subsidence. In an RCM report, subsidence is split into three categories collectively called "surface impact zones". These are intact zone, fracture zone and cave zone.[3] The report indicates a substantial cave zone, for this project, with a long dimension of 112 miles and a depth exceeding 850 feet.[3]

The company is exploring solutions for tailings produced which will be on the order of 1.599 billion tones or 19.9 billion cubic feet. One possibility is using existing mined out open pits as tailing deposits.[4] The company hopes to have the new mine in production by 2020.[1][2] The proposed mine might be capable of producing 25 percent of projected future US copper demand for several decades.[2]

Project status[edit]

The project is currently stalled pending a proposed land swap with the federal government.[5] Resolution Copper has proposed to give the federal government 4,500 acres (18 km2) of environmentally sensitive land in Arizona in exchange for the 3,000-acre (12 km2) proposed mine site, which includes the popular Oak Flat Campground, which has been a protected area since 1955.[6]

In May 2009, Arizona Democratic representative Ann Kirkpatrick introduced legislation in Congress to complete the land swap. The swap already has the support of Arizona's two Republican senators.[7] The swap also has considerable opposition and may have cost Ann Kirkpatrick her congressional seat in her 2010 loss to Paul Gosar; however, she regained the seat in 2012 and won again in 2014.[8][9][10]

The proposed land swap was readdressed during the 113th United States Congress when Rep. Paul A. Gosar (R, AZ-4) introduced the Southeast Arizona Land Exchange and Conservation Act of 2013 (H.R. 687; 113th Congress).[11]

Investment in project[edit]

Resolution Copper has invested almost a billion dollars in the Superior project through 2012, and plans a $6 billion investment to develop the mine, if the Federal land exchange is approved. Pending approval, the project budget has been cut from about $200 million in 2012 to $50 million in 2013.[12]

Resolution Copper also owns the mineral rights acquired from ASARCO to the Superior East deposit which is another deep seated porphyry deposit within a mile to the east.[13][14]

See also[edit]


  1. ^ a b Resolution Copper Mining LLC reports an Inferred Resource, 29 May 2008 news release
  2. ^ a b c "History". About Us. Resolution Copper Mining. Retrieved December 15, 2014. 
  3. ^ a b "Environment". Resolution Copper Mining. Retrieved December 15, 2014. 
  4. ^ Resolution Copper: FAQs
  5. ^ Niemuth, Nyal J. "Arizona". Mining Engineering. May 2008. p.71.
  7. ^ Erin Kelly and Dan Nowicki, Arizona Republic (21 May 2009): Bill revives land swap for Arizona copper mine, accessed 29 May 2009.
  8. ^ Sean J. Miller (May 11, 2010). "Arizona lawmakers spark ire of Apaches over copper mine, land exchange". The Hill. Retrieved December 15, 2014. 
  9. ^ Sean J. Miller (September 27, 2010). "Legislative setbacks could be costly for freshman Democrat". The Hill. Retrieved December 15, 2014. 
  10. ^ "Live Results in U.S. House for Arizona". Huffington Post. Retrieved December 15, 2014. 
  11. ^ "H.R. 687 - Summary". United States Congress. Retrieved 17 September 2013. 
  12. ^ "Letter to the community", November 30, 2012
  13. ^ BUREAU OF LAND MANAGEMENT lead file AMC60069
  14. ^ Sell, James D. "Porphyry Copper Deposits of the American Cordillera". "Arizona Geological Society Digest 20" 1995. p.373-395.

Further reading[edit]

  • Scott Manske & Alex Paul, Geology of a Major New Porphyry Copper Center in the Superior (Pioneer) District, Arizona. 2002, Economic Geology v. 97 no. 2 p. 197-220: Abstract. doi: 10.2113/gsecongeo.97.2.197

External links[edit]