Site-Specific Seismic Hazard Evaluation for the Proposed Resolution Copper Mine, Southern Arizona
A probabilistic seismic hazard analysis (PSHA) and deterministic seismic hazard analysis (DSHA) were performed for Resolution Copper’s Mine site including the area above the deposit (Mine area) and the area covering the East Plant site (Shafts 9/10). The peak horizontal ground acceleration (PGA) value for a return period of 2475 years is 0.06 g. This return period is used in the International Building Code (IBC) for the design of typical buildings and other structures in the U.S. A value of 0.06 g indicates a low level of hazard due to the low level of historical seismicity in southern Arizona and the absence of nearby Quaternary faults near the Mine. By comparison, PGA values along coastal California for a return period of 2475 years often exceed 1 g.
Wong, I., P. Thomas, N. Lewandowski, and S. Lindvall. 2018. Site-Specific Seismic Hazard Evaluation for the Proposed Resolution Copper Mine, Southern Arizona. Prepared for Resolution Copper. Walnut Creek, California: Lettis Consultants International Inc. January 23.
Email Address Created for Land Exchange Questions
The Southwestern Region Office of Lands and Minerals Management is overseeing and administering the land exchange and appraisal process which includes the 2,422-acre Oak Flat Federal Parcel. All questions about the land exchange and appraisal process should be emailed to SM.FS.firstname.lastname@example.org
Programmatic Agreement Info
To comply with Section 106 of the National Historic Preservation Act, the Tonto National Forest developed a Programmatic Agreement (PA) and included it in Volume 5, Appendix O of the final EIS. The PA was created in cooperation with the Advisory Council on Historic Preservation, the State Historic Preservation Office, tribes and other consulting parties. The PA contains an agreed upon process for identifying, evaluating and addressing adverse effects to historic properties associated with this undertaking.
To review Volume 5 and the PA, Download Vol 5 PDF, 27 MB.