Water Resources

This tech memo has been prepared to summarize results of the Phase II field investigations of the Near West site, conducted in support of RCM's ongoing prefeasibility studies for storage of RCM mine tailings. The purpose of Phase II investigations was to conduct electrical resistivity surveys to assess the potential occurrence of shallow groundwater at the Near West site.

The purpose of the Phase I assessment was to conduct non-invasive field investigations to supplement information obtained previously from published data and to plan Phase III investigations involving subsurface exploration drilling and hydrologic testing.

This tech memo presents the first update of the Groundwater Assessment prepared by Golder Associates on behalf of Resolution Copper Mining.  This work is required as part of the Area-Wide Aquifer Protection Permit for the West Plant Site.  Specifically, this tech memo partially fulfills APP Compliance Schedule Item (CSI) No. 2.

An investigation of hydrogeologic conditions for the Superior Basin has been completed by Montgomery. The chief objective of the survey was to evaluate the cause of recent water level declines reported for some wells located within and adjacent to the Queen Creek corridor through the Superior Basin, as well as observed declines in discharge from Whitlow Ranch Dam.

An evaluation of an approximately 560-acre private parcel for the presence of potential waters of the U.S.

At HRES-19 and HRES-20, the primary target drilling depth was the contact between the Tertiary Apache Leap Tuff and the underlying White Tail Conglomerate. During drilling operations, data was collected to better characterize the hydrogeologic conditions within the Apache Leap Tuff. The target depth was reached at HRES-19, although the depth to the White Tail Conglomerate was shallower than expected. The White Tail Conglomerate was not reached at HRES-20 due to technical issues encountered while drilling.

This draft technical memorandum has been prepared to summarize results of drilling, construction, and development of groundwater production well RESPW-01. The well was installed to intersect mine workings on the 4400 Mine Level adjacent to Shaft No. 8 of the Magma Mine in order to dewater that level and overlying levels.

This technical memorandum was prepared to summarize modifications made to wells HRES-02, HRES-05, and HRES-10 in 2011.

In February 2010, Montgomery published a report entitled "Interim Results of Groundwater Monitoring, Upper Queen Creek and Devils Canyon Watersheds" (M&A 2010) which reported all hydrochemical and isotopic data available through the second quarter of 2009. The current report presents hydrochemical and isotopic data collected since M&A 2010 was published.

This technical memorandum was prepared to summarize results of drilling and construction at hydrologic test wells PHRES-01, PHRES-02, PHRES-03, and PHRES-04. The wells were installed to provide observation wells during the long-term pumping test at well HRES-09, and to provide locations for characterization of fracture distribution and hydraulic conductivity in the Apache Leap Tuff (ALT) aquifer in the vicinity of hydrologic test well HRES-09.