Idaho-Maryland Mine Project

3 Documents in Project


SCH Number
Lead Agency
Nevada County
Document Title
Idaho-Maryland Mine Project
Document Type
FIN - Final Document
Present Land Use
The proposed project’s surface components would be located on approximately 175.64 acres consisting of the Brunswick Industrial Site, the Centennial Industrial Site, and a 0.30-acre portion of East Bennett Road for off-site improvements associated with a potable water pipeline easement. The project sites contain the historic Idaho-Maryland Mine underground gold mine. The Nevada County General Plan designates the sites as Industrial (IND). The Brunswick Industrial Site is zoned Light Industrial with Site Performance Combining District (M1-SP). The Centennial Industrial Site is zoned Light Industrial (M1).
Document Description
The proposed project would reinitiate underground mining and gold mineralization processing for the Idaho-Maryland Mine over an 80-year permit period with gold mineralization processing and underground exploration and mining proposed to operate 24 hours a day, 7 days a week during full operations. Following completion of mining and processing activities, the project sites would be reclaimed to open space and land suitable for future development of industrial uses. Generally, the proposed project would include the following components: • Dewatering the existing underground mine workings; • Underground mining at a depth of 500 feet or more in areas underlying the mineral rights properties; • Construction and operation of aboveground processing and water treatment facilities at the Brunswick Industrial Site; • Engineered fill placement for potential future industrial pad development at the Centennial and the Brunswick Industrial Sites; • Installation of a potable water pipeline for residential potable water supply; and • Reclamation of the project sites in accordance with a proposed Reclamation Plan.

Contact Information

Matt Kelley
Agency Name
Nevada County Community Development Agency
Job Title
Senior Planner
Contact Types
Lead/Public Agency


Cross Streets
Idaho Maryland Rd., Brunswick Rd., E. Bennett Rd., Whispering Pines Ln.
Total Acres
State Highways
20, 49, 174
Nevada County Airport
Wolf Creek, South Fork Wolf Creek

Notice of Completion

State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Transportation, District 3 (DOT), California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Energy Commission, California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), Central Valley Flood Protection Board, Department of Toxic Substances Control, Office of Historic Preservation, Sierra Nevada Conservancy, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 9, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance
Development Types
Industrial (Sq. Ft. 1, Acres 104, Employees 1), Water Facilities (N/A)(Type Pipeline, MGD 1), Mining (Mineral Gold)
Local Actions
Rezone, Use Permit
Project Issues
Aesthetics, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Noise, Septic System, Transportation, Tribal Cultural Resources, Vegetation, Wetland/Riparian, Wildfire


Notice of Completion [NOC] Transmittal form

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

Download CSV Download All Attachments New Search Print