Resolution Copper Mining

Incident(s) summary

Response to GS-4: Provide input on alleged missed faults (lineament analysis) and whether they were incorporated into subsidence modeling.

Describes Resolution's plan to implement the following standard practices for the prevention of invasive species introduction on Project areas located on National Forest System lands.

The Pond and Atlantis climbing areas are on Resolution Copper’s private property. The majority of the Mine area is located on Resolution’s property with Resolution holding mining claims to the remainder of the area. If you plan on climbing in these areas please click on the button below to e-sign the required waiver.

Please see the attached responses to Groundwater Modeling Workgroup action items GW-75, GW- 76, GW-77, GW80 and GW-81 for your review and consideration.

This memo is written to provide an explanation of the methodology used to derive the rock mass strength for the Apache Leap Tuff (Tal).

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.

Receipt notice for letter from TNF Supervisor dated March 8, 2018 and concurrence with approach to modify range of alternatives considered in detail in Draft EIS.

Resolution Copper is providing some additional information related to the nature and characteristics of underground hard rock mineral deposits and how the characteristics of the deposits define the mining methods that are used with a particular focus on selective methods such as cut and fill and unselective methods such as block caving as the two methods that have been used by mines in and around the Copper Triangle for the last century.

100' slices through the deposit from the geologic model.