This Integrated Watershed Summary has been developed by Rosemont Copper Company (Rosemont) to address comments received in response to the draft environmental impact statement (DEIS) for the Rosemont Mine Plan of Operations (MPO). The DEIS was prepared by representatives of the Coronado National Forest (CNF) to fulfill the U.S. Department of Agriculture, Forest Service’s (USFS) role as lead agency responsible for assessing the direct, indirect, and cumulative impacts associated with the proposed development of the Rosemont Copper Project (Project) under the National Environmental Policy Act (NEPA). Many of the comments received on the DEIS reflected concern about impacts to water resources and specifically about the relationship between the proposed development at the Project site and existing features of the regional watershed. This document integrates the results of analyses on geochemistry, seepage, surface water quantity and quality, geomorphology, groundwater quantity and quality, and aquatic resources into an accessible document that fully characterizes the Project’s impacts to water resources both at the Project site and at a watershed scale. Most of these analyses were also included in the DEIS. However, this document concisely describes the information related to water resources and demonstrates how the studies and analyses relevant to water resources have been used to improve the Project designs in order avoid and manage impacts on the environment and water resources within the Cienega Creek/Davidson Canyon watersheds.
Rosemont Copper Company. 2012a. Integrated Watershed Summary. Tucson, AZ: Rosemont Copper Company. June.