Rosemont Copper was a proposed large open pit copper mine project owned by Hudbay. The project site is located within the Santa Rita Mountains and Coronado National Forest, in Pima County of southern Arizona. It has undergone a permitting review process under the direction of the United States Forest Service and the U.S. Army Corps of Engineers and has been delayed by legal judgements and suspension of its operating permit by the US Army Corps of Engineers.
The Rosemont Copper Mine site is approximately southeast of Tucson. The nearest established communities are Sonoita, Patagonia, Sahuarita, Green Valley, Corona de Tucson, and Vail.
Opponents argue that the mine will pollute surface and subsurface water and damage aquifer quality and quantity, destroy natural habitats and endangering populations of vulnerable and unique wildlife, cause regional air pollution, and harm the local tourism industry.Save the Scenic Santa Ritas - Rosemont Arguments, Scenic Santa Ritas
Proponents argue that the project will create jobs, generate tax revenue and reduce American dependence on foreign sources of copper.Rosemont Benefits, Southern Arizona Business Coalition
Following legal review of Rosemont's permits, on July 31, 2019, U.S. District Judge James Soto overturned the U.S. Forest Service's 2017 decision approving the mine and its 2013 final environmental impact statement clearing the way for that approval. On August 23, 2019, the US Army Corps of Engineers issued a letter to Rosemont Copper Company that immediately suspended its permit. In May 2022, the Ninth Circuit upheld District Court Judge Soto's order blocking the proposed mine on grounds of the 1872 Mining Law. The Ninth Circuit's decision was not appealed to the Supreme Court. The ruling affects other potential mines in the Ninth Circuit that may seek to dispose of waste on public lands under color of the 1872 Mining Law.
Context The Rosemont Copper property is located in Pima County, approximately southeast of Tucson. It straddles two historic mining districts: the Rosemont Mining District and the adjacent Helvetia Mining District.
Copper became the focus of mining in the Santa Cruz Valley and elsewhere in Southern Arizona beginning in the late 1880s."Mining Booms", Santa Cruz Valley Heritage Alliance By 1907, Southern Arizona led world copper production."Mining Booms", Archaeology Southwest Sporadic prospecting reportedly began in the northwestern portion of the Rosemont property, in the Helvetia Mining District, in the mid-1800s. Production from mines on both sides of the northern Santa Rita Mountains brought forth construction and operation of the Columbia Smelter at Helvetia on the west side of the Santa Rita Mountains and the Rosemont Smelter in the Rosemont Mining District on the east side of the Santa Rita Mountains.
Copper production ceased in 1951. In the decades since, the area continued to be the site of successive exploration efforts. In 1956, the American Exploration and Mining Company began exploring the Broadtop Butte prospect. Banner Mining Company acquired most of the claims in the area by the late 1950s. Anaconda Mining Company acquired the claims to the property in 1963 and undertook a major exploration campaign that identified the Rosemont deposit as a major porphyry copper ore body. The company also advanced the Broadtop Butte and Peach-Elgin prospects. The project continued after Amax and Anaconda formed the Anamax partnership and ceased in 1986 when Anamax sold the property to a real estate company during the dissolution of Anaconda. ASARCO purchased the property in 1988, renewed exploration of the Peach-Elgin prospect and initiated engineering studies. ASARCO sold the entire property to real estate interests in 2004. Augusta acquired the Rosemont Property in 2005. Hudbay acquired the property in 2014.
Mineral rights The core of the Rosemont property consists of 132 patented lode claims that encompass an area of ."Mine Plan of Operations", Rosemont Copper Mine A patented mining claim is one for which the federal government has passed its title to the claimant, making it private land."Mineral Patent Application", Bureau of Land Management A contiguous package of 850 unpatented lode mining claims with an aggregate area of approximately surrounds the core of patented claims. An unpatented mine claim is one in which land is essentially leased from the government for the purpose of extracting minerals."Mining Claims", Rosemont Copper Mine Most of the unpatented claims are on federal land administered by the United States Forest Service. In addition, a limited number of claims in the northwest portion of the Property are on federal land administered by the Bureau of Land Management.
Resources Rosemont has proven and probable reserves of 5.9 billion lbs of copper and 194 million lbs of molybdenum and inferred sulfide mineral resources of 1.1 billion lbs of copper and 35 million lbs of molybdenum.Mineral Resources Estimate, US Forest Service EIS
Geology The regional, local and property geology of the Rosemont deposit consists of Precambrian sedimentary and intrusive rocks, which form the regional basement under a Palaeozoic sequence of quartzites, siltstones, and carbonate rocks. Sedimentary deposition ceased for a time during uplift and formation of a widespread unconformity in the early Mesozoic, and then resumed with the deposition of continental and shallow marine deposits.Geology and Seismotectonic Review, Vector Colorado
Subsequent granitic intrusions and felsic volcanic eruptions dominated the late Mesozoic and early Cenozoic, corresponding to the Laramide Orogeny when most of the porphyry copper deposits of the region formed. Compressional tectonics during the Laramide Orogeny created both low-angle thrust faults and high-angle strike-slip faults. Extensional tectonic activity followed the Laramide Orogeny and was accompanied by voluminous felsic volcanic eruptions. Numerous low-angle normal faults formed during this time. These faults have been particularly important in the Rosemont area. The extensional tectonics eventually produced the large-scale block faulting that produced the present Basin and Range Province throughout the southwestern United States.Mine Plan of Operations, US Forest Service EIS
History
In 2007, Augusta Resource Corporation, Rosemont Copper's parent company, filed a Mine Plan of Operations with the U.S. Forest Service for a proposed open-pit mine in the Santa Rita Mountains section of the Coronado National Forest.Mine Plan of Operations, Augusta Resource Rosemont Copper submitted a revised mine plan in July 2007.AERMOD Modeling Report to Assess Ambient Air Quality Impacts, Arizona Department of Environmental Quality The official start to Rosemont Copper's National Environmental Policy Act (NEPA) process began in February 2008.
In March 2008, The Coronado National Forest began their NEPA scoping process for the Environmental Impact Statement. Over 11,000 scoping comment submissions were received. The Draft EIS for Rosemont contained approximately 400 reports on topics such as air quality, water resources, soils and reclamation, and biological resources.List of Reports, US Forest Service EIS The public comment period for Rosemont's draft EIS closed on January 31, 2012.Public Meetings Notice, US Forest Service EIS The Forest Service Southwestern Regional Office released their Final Environmental Impact Statement (FEIS) and draft Record of Decision (ROD) for the Rosemont Copper Project on December 13, 2013.Final Environmental Impact Statement for the Rosemont Copper Project: A Proposed Mining Operation, Coronado National Forest, Pima County, Arizona. Tucson, AZ: United States Department of Agriculture, Forest Service, Southwestern Region, 2013. On June 6, 2017, the Coronado National Forest completed their Record of Decision for the Project (ROD).
Rosemont's permits faced legal hurdles. Following his legal examination of the issued permits for the Rosemont Mine, on July 31, 2019, U.S. District Judge James Soto overturned the U.S. Forest Service's 2017 decision approving the mine and its 2013 final environmental impact statement clearing the way for that approval. Specifically, he ruled that the mining company cannot put its waste rock and mine tailings on Forest Service land even though it has mining claims on it because it has failed to prove the claims are valid. The Mining Act of 1872 has long been interpreted to convey the same mineral rights to such lands by the Forest Service and the Bureau of Land Management.
Following the determination from Judge Soto that Rosemont's attempt to use Forest Service land for waste disposal was invalid, on August 23, 2019, General D. Peter Hemlinger PE, Division Commander, Northwestern Division, US Army Corps of Engineers wrote a letter to Ms. Katherine Ann Arnold, PE, Director of Environment for Hudbay, that rescinded Rosemont's operating permit. Gen. Hemlinger wrote: "I am writing to inform you that I am suspending your Department of the Army (DA) permit, issued on March 8, 2019, for the Rosemont Copper project (SPL-2008-00816- MB). This suspension is effective immediately."
In May 2022, the Ninth Circuit upheld District Court Judge Soto's order blocking the proposed mine on grounds of the 1872 Mining Law. The Ninth Circuit's decision was not appealed to the Supreme Court. The ruling affects other potential mines in the Ninth Circuit that may seek to dispose of waste on public lands under color of the 1872 Mining Law. Hudbay is now seeking partners for a new mine proposal, Copper World, that would be entirely restricted to its privately held property near Helvetia, at least until such time as permission can be obtained for disposal of waste on federal lands.
Permits and approvals Before the Ninth Circuit ruling invalidated the basis for the use of Forest land, Rosemont Copper had secured the following major permits necessary to begin construction on the proposed mine: Record of Decision (ROD)[rosemonteis.us Final Record of Decision], Coronado National Forest memorializes the Forest Service decision and summarizes the requirements determined during the EIS process. Aquifer Protection Permit"Aquifer Protection Permit Issued", Arizona Department of Environmental Quality is needed if you own or operate a facility that discharges a pollutant either directly to an aquifer or to the land surface or to the vadose zone (the area between land surface and the water table where the moisture content is less than saturation) in such a manner that there is a reasonable probability that the pollutant will reach an aquifer.Aquifer Protection Permit, Arizona Department of Environmental Quality Construction Storm Water General PermitConstruction Storm Water General Permit Issued, Arizona Department of Environmental Quality is required for any point source discharge of pollutants to a water of the United States. Because storm water runoff can transport pollutants to either a municipal separate storm sewer system or to a water of the United States, permits are required for those discharges.Construction Storm Water General Permit, Arizona Department of Environmental Quality Agriculture Land Clearing PermitAgriculture Land Clearing Permit Issued is for any activity that includes the clearing of more than and which is not exempt by this ordinance, shall be required to have a Clearing Permit. Air Activity PermitAir Activity Permit Issued, Pima County Department of Environmental Quality PDEQ protects air quality by regulating fugitive dust emissions. The Activity Permit Program ensures that individuals are aware of fugitive dust emissions regulations and requires them to provide information regarding the location and types of activities so the department can monitor compliance.Air Activity Permit, Pima County Department of Environmental Quality