Documents

This memorandum provides a background of relevant state regulations and guidelines for assessing fault-related geohazards around tailings facilities, summarizes published geological mapping around the Skunk Camp TSF site, evaluates the Project’s assessments of Quaternary faulting, and provides recommendations to fill key knowledge gaps.

Phase I Environmental Site Assessment (ESA) for the Dripping Springs parcel, composed of approximately 160 acres located in Gila and Pinal Counties, Arizona.

American Community Survey 5-Year Estimates Subject Tables

The Forest Service is proposing changes to the current management of an area within the Globe Ranger District of the Tonto National Forest designated as the Apache Leap Special Management Area.

COVER ONLY

Email communication as follow-up to submittal to include mitigation requiring water levels be maintained at current levels, and replacement of water lost in fractured Queen Creek bed by pumping water into Queen Creek above Magma Bridge.

Email communication on questions asked during the Resolution Copper Project DEIS public meetings on 9/10/19 and 9/12/19.

At approximately 12:28 p.m. local time on January 25, 2019, tailings dam B-I at Vale S.A.’s Córrego do Feijão Iron Ore Mine (“Dam I”), located 9 kilometers (km) north-east of Brumadinho, in the state of Minas Gerais, Brazil, suffered a sudden failure, resulting in a catastrophic mudflow that traveled rapidly downstream.

This technical memorandum was prepared in response to Groundwater Work Group Action Item WR-12 “Pull well records and other information for QV and model the impacts” to provide information to address Draft Environmental Impact Statement (DEIS) comments about potential impacts to Queen Valley, Arizona water supplies from proposed Resolution Copper mining activities.

This paper discusses reasons including seepage, foundation failure, overtopping, and earthquake for tailings dam failures and explores failure mechanisms by referring to the available literature.