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Environmental Assessment United States Department of Agriculture Supplemental Forest Service Southwestern Environmental Region April 2020 Assessment Proposed Riverbend Placer Mine and Lost Nugget Reclamation Project Bradshaw Ranger District Prescott National Forest In accordance with Federal civil rights law and U.S. Department of Agriculture (USDA) civil rights regulations and policies, the USDA, its Agencies, offices, and employees, and institutions participating in or administering USDA programs are prohibited from discriminating based on race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, family/parental status, income derived from a public assistance program, political beliefs, or reprisal or retaliation for prior civil rights activity, in any program or activity conducted or funded by USDA (not all bases apply to all programs). Remedies and complaint filing deadlines vary by program or incident. Persons with disabilities who require alternative means of communication for program information (e.g., Braille, large print, audiotape, American Sign Language, etc.) should contact the responsible Agency or USDA’s TARGET Center at (202) 720-2600 (voice and TTY) or contact USDA through the Federal Relay Service at (800) 877-8339. Additionally, program information may be made available in languages other than English. To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, found online at http://www.ascr.usda.gov/complaint_filing_cust.html and at any USDA office or write a letter addressed to USDA and provide in the letter all of the information requested in the form. To request a copy of the complaint form, call (866) 632-9992. Submit your completed form or letter to USDA by: (1) mail: U.S. Department of Agriculture, Office of the Assistant Secretary for Civil Rights, 1400 Independence Avenue, SW, Washington, D.C. 20250-9410; (2) fax: (202) 690-7442; or (3) email: [email protected]. USDA is an equal opportunity provider, employer, and lender. i Proposed Riverbend Placer Mine and Lost Nugget Placer Mine Reclamation Project Supplemental Environmental Assessment Chapter 1: Purpose and Need 1 Introduction 1 Management Direction 3 Purpose and Need for Action 4 Proposed Action 4 Decision Process and Administrative Review 5 Public Involvement 6 Issue Identification 8 Issues Considered but Dismissed from Further Analysis 8 Air Quality Noise Livestock Grazing Visual Resources Heritage Resources Recreation Document Structure 10 Chapter 2: Alternatives 12 Alternative 1: No Action Alternative 12 Alternative 2: Proposed Action 12 Mitigation Measures 30 Chapter 3: Affected Environment and Environmental Consequences 33 Introduction 33 Hydrology Groundwater Surface Water Water Quality Soils/Watershed Mining and Minerals 34 Biological Resources 34 Wildlife Vegetation Cumulative Effects Analysis 44 Cumulative Effects Analysis Area Past, Present, and Reasonably Foreseeable Future Actions Cumulative Effects i Chapter 4: Consultation & Coordination 55 List of Preparers List of Federal, State and Local Agencies List of Tribes Chapter 5: References 56 Appendices Reclamation Plan List of Tables Table 1. Watershed acreage and project percent of watershed acres by watershed and ownership Table 2. Watershed acreage by ownership Table 3. Ecotypes of Prescott National Forest land in the 6th level watersheds Table 4. Prescott National Forest Soil Condition by Watershed in Acres Table 5. Road Miles by 6th Level Watershed on the Prescott National Forest Table 6. Road Miles by 6th Level Watershed for All Ownerships Table 7. Past, present and ongoing projects considered during the cumulative effects analysis. List of Figures Figure 1. Project area Figure 2. Proposed Riverbend Placer Mine overall site plan Figure 3. Proposed Riverbend Placer Mine processing area site plan Figure 4. Current ore-processing equipment at Lost Nugget site Figure 5. Current gold-processing cabana at Lost Nugget site Figure 6. Schematic diagram of the ore recovery process Figure 7. Lined processing pond at Lost Nugget site revegetation including wetland species Figure 8. Lost Nugget site showing natural revegetation including willow and desertbroom Figure 9. Lost Nugget site. Note natural revegetation dominated by invasive species Figure 10. Current Lost Nugget site including revegetation largely by invasive species Figure 11. Current Lost Nugget site including natural revegetation by native desertbroom Figure 12. Typical upland (foreground) and riparian vegetation in and near the project area ii Document Structure This Supplemental Environmental Assessment (SEA) has been prepared in compliance with the National Environmental Policy Act (NEPA) and other relevant Federal and State laws and regulations. This Supplemental Environmental Assessment discloses the direct, indirect, and cumulative environmental impacts that would result from the Proposed Action and alternatives. The document is organized into the following chapters: Purpose and Need includes information on the history of the project proposal, the purpose of and need for the project, and the agency’s proposal for achieving that purpose and need. This section also details how the Forest Service informed the public of the proposal and how the public responded. Alternatives provides a more detailed description of the agency’s Proposed Action as well as the No Action Alternative. This discussion also includes mitigation measures. Affected Environment and Environmental Consequences describes the environmental effects of implementing the Proposed Action. This analysis is organized by resource area. Within each section, the affected environment is described first, followed by the effects of the No Action Alternative that provides a baseline for evaluation and comparison of the Proposed Action that follows. Consultation and Coordination provides the list of preparers and a list of agencies consulted and/or contacted during the development of the Supplemental EA. References lists the documents and other sources relied upon for preparation of this document Appendices provide more detailed information to support the analyses presented in the Supplemental EA. The appendices include a reclamation plan. 1 CHAPTER 1: PURPOSE AND NEED Introduction Pine Creek Mining, Inc., proposes placer mining, bulk testing, and reclamation in the Hassayampa River drainage near Orofino Wash east of Wilhoit, Arizona, on mining claims within Federal lands administered by the U.S. Department of Agriculture (USDA), Forest Service, Prescott National Forest, Bradshaw Ranger District. The Proposed Action consists of mining terrace gravels, non- chemical processing of these minerals, and concurrent reclamation on the entire Riverbend Placer claim and a portion of the Miners Delight claim and post-operational reclamation at the previously mined Lost Nugget claim site. The estimated Riverbend mine life is approximately 15 years with one working shift per day and processing 50 cubic yards per hour, though this could change based on several factors such as extent and quality of ore, acquired equipment, and economic and weather conditions. Both claims are part of the Gold Basin Project approved by the Prescott National Forest in 2005 following preparation of an Environmental Assessment (EA) and Finding of No Significant Impact in compliance in with the National Environmental Policy Act. This is a Supplemental EA analyzing a new area of proposed mining in the Gold Basin Project and an updated reclamation plan for a previously mined site. Figure 1 provides a map of the project area including the relevant claims. Pine Creek Mining, Inc., the owner and operator of the mining claims, intends to mine locatable minerals. Locatable minerals are, in general, those hardrock minerals that are mined and processed for the recovery of metals, certain nonmetallic minerals, and uncommon varieties of mineral materials (USDA 2007). The term placer refers to a type of deposit in which the mineral of interest is disseminated in sands and/or gravels. Placer deposits result from the mechanical concentration of heavy minerals, such as gold, released from their host rock by erosion and transported by flowing water. In the upper Hassayampa River basin, gold may be hosted in quartz veins that have intruded into Precambrian granite and schist. Erosion and stream flow have, in some case, released this gold and subsequently concentrated it in stream sediments along the Hassayampa River channel. Some of these sediments were successfully mined in the past (Wilson 1961). The proposed project is located entirely on Prescott National Forest land located in Sections 11, 14 and 15, Township 12 North, Range 3 West, Gila & Salt River Meridian, as depicted on the Wilhoit (1969) USGS 1:24,000 quadrangle (Figure 1). Elevations range from approximately 4,100 to 4,520 feet in the project area, which is in the Central Highlands physiographic province. The major topographic feature in the area is the Hassayampa River canyon, which drains the western side of the rugged Bradshaw Mountains south of Prescott. 2 Figure 1. Project area including mining claim boundaries 3 Management Direction The management of National Forests is guided by laws, regulations, and policies that provide the framework for forest plans and site-specific project-level analysis such as this Supplemental EA. The Prescott National Forest Land and Resource Management Plan (USDA 2015) goals and objectives are intended
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