Documents

Phase I Environmental Site Assessment (ESA) for an approximately 147-acre site (JX Ranch, or “the Property”) along Turkey Creek in the Sierra Ancha Mountains of Tonto National Forest in Gila County, Arizona.

This technical memorandum was prepared to summarize results of drilling, construction, equipping, and testing at hydrologic test wells DHRES-03, DHRES-04, and DHRES-05/DHRES-05B. The wells were installed to characterize hydrogeologic conditions in the Gila Conglomerate and Apache Leaf Tuff west of the Concentrator Fault in the vicinity of West Plant site and to provide monitoring locations for the aquifer west of the Concentrator Fault during dewatering operations in 2010 and 2011.

The purpose of this report is to 1) compile Arizona hedgehog cactus survey data collected during preparation of the Pre-feasibility Activities Plan of Operations; and 2) compile previously completed survey data from the vicinity of the PAA that may inform the analysis of the effects of the Pre-feasibility Activities to AHC.

Resolution Copper Mining Company (RCM), acting jointly with Rio Tinto (RT-OTX), asked Mark Logsdon (Geochimica, Inc, Aptos, CA) to prepare a plan to geochemically characterize the rock mass that may be subject to chemical weathering as a consequence of block-caving operations at The Resolution property near Superior, Arizona. Results from this study will be used by RCM and its contractors to develop a geochemical model of the block-cave zone as it affects operational and closure considerations.

The basic objective of this guide is to help engineers, planners, environmental specialists, and road managers make good decisions, protect the environment, and build good low-volume roads.

This report summarizes the meteorological, upper air, nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), and particulate matter (PM) data collected at the Resolution Copper Project near Superior, Arizona for the first quarter, January 1 – March 31, 2016.

We present a new empirical ground motion model for PGA, PGV, PGD and 5% damped linear elastic response spectra for periods ranging from 0.01–10 s. The model was developed as part of the PEER Next Generation Attenuation (NGA) project. We used a subset of the PEER NGA database for which we excluded recordings and earthquakes that were believed to be inappropriate for estimating free-field ground motions from shallow earthquake mainshocks in active tectonic regimes.

This paper compares a number of approximations used to estimate means and variances of continuous random variables and/ or to serve as substitutes for the probability distributions of such variables, with particular emphasis on three-point approximations.

We present tectonic reconstructions and an accompanying animation of deformation across the North America–Pacific plate boundary since 36 Ma.

The Frazier Mountain paleoseismic site is located on a poorly understood section of the southern San Andreas fault, mid-way between the well-known Carrizo Plain and Mojave sites of Bidart Fan and Pallett Creek. Emerging paleoseismic evidence indicates that earthquakes along this stretch repeat at a similar pace, with an average interval of - 122 years between AD. 1000 and 1857.