Documents

The Safety standard D5 - Management of tailings and water storage facilities (the standard) applies to all Rio Tinto projects, business units and managed operations, including new acquisitions. It covers all development phases from planning, design through construction, operation, closure and, post-closure where applicable.

The exact time and place of the original introduction of sulfur cinquefoil to North America is not known. The 1st collection of sulfur cinquefoil in North America was made sometime before 1900 in Ontario.

This paper summarizes a review of tailings dam incidents, and examines the key constituents contributing to the causes and consequences of these incidents. Comparisons are drawn with water-storage dams, and conclusions are presented on reducing the potential for future incidents.

Subsidence is a slow and gradual process that is predicted, closely monitored and controlled. Mining will start from a point away from Apache Leap, and after 40 years of block-cave mining, projections are that the subsidence zone will be at its deepest (1,100 feet) but will still be more than 1,100 feet from the Leap after mining has ceased.

Arizona’s climate is changing. The state has warmed about two degrees (F) in the last century.

In response to Resolution Copper Mining’s (RCM’s) submittal of a plan of operations for pre-feasibility activities, the Forest Service prepared this EA in compliance with the National Environmental Policy Act (NEPA). This EA discloses the direct, indirect and cumulative environmental impacts that would result from the proposed action and alternatives.

This errata sheet documents corrections to the text of the published EA, and should be reviewed along with the final EA. These corrections reflect instruction provided by the Objection Reviewing Officer in letters in December 2017.

Potential aquatic features were identified within the vicinity of the GPO Project Area to be surveyed for the presence of native fish species.

For guidance on relationships between caving depth and surface subsidence, a comprehensive database was developed after an exhaustive search of published data from cave mining operations from around the world.