Three Kids Mine

The Hydro pit, Hulin pit, three tailings ponds, overburden, flotation tank foundations, and a portion of the ore yard are visible in this aerial photograph of the Three Kids Mine site. as well as the nearby Lake Mead Boat Storage and Laker Plaza businesses.
Features of the Three Kids Mine site include open pits, tailings ponds, overburden, flotation tank foundations, and ore yard. There are two boat storage businesses nearby.

What's Next?

NDEP will host an open house Community Information Meeting from 5:30 p.m. to 7:00 p.m. on Thursday, June 30, 2022 at Pinecrest Academy, located at 220 Taylor Street, Henderson, NV 89015. This will be an opportunity for the community to learn more about the environmental assessment and closure of the Three Kids Mine in Henderson, Nevada. This will be the first of a few upcoming opportunities for the community to provide valuable input to the project. NDEP will be available to answer environmental questions and discuss the next steps in the process.


The Three Kids Mine was an open-pit manganese mine discovered in Clark County, Nevada in 1917. During its early years of operation, which coincided with World War I, manganese from the mine was used in military weapons and equipment. With the end of the war, and the subsequent drop in demand for manganese, mining activities slowed and the Three Kids Mine remained nearly dormant for the next several years.

In 1942, a mill was constructed for on-site processing of manganese ore to help meet the demand for manganese, which had been reignited as a result of World War II. Around this same time, the unrelated Basic Magnesium Incorporated complex, also located in Clark County, Nevada, produced magnesium for the war effort. However, the end of the war once again represented a decline in activity at the Three Kids Mine, and the mill was closed in 1944.

Site activities remained limited up until 1951, when the mill was remodeled and subsequently reopened. The mine and mill continued producing manganese until all open pits were exhausted, and in 1961, all site operations were permanently discontinued. Reserves of lead and manganese that had been stockpiled on-site were sold in the years that followed, and in the early 1980s, a few parcels from the property were sold and redeveloped. Key features of the former Three Kids Mine include open pits, waste rock, ore yard, mill site, and tailings ponds.

Current Status

Several assessments and studies of the Three Kids Mine site took place in the late 90s through early 2000s. In 2007, a Phase I Environmental Site Assessment (ESA) of the site was conducted. The Phase I ESA identified recognized environmental conditions (RECs) at the site through public records review, interviews with knowledgeable parties, and physical site inspections. RECs include dusts, residues, and processing wastes containing lead, arsenic, manganese, and petroleum.

On July 25, 2014, U.S. Congress approved the Three Kids Mine Remediation and Reclamation Act. This legislation provides a framework by which Federally-owned land within the 1,262-acre Three Kids Mine site can be conveyed to the City of Henderson Redevelopment Agency for the purposes of site assessment, remediation, and reclamation. Efforts to complete the land transfer by early 2023 are currently underway and have included sampling and analysis of tailings, waste rock, and soils throughout the site. Documents summarizing these activties can be downloaded from the links below.

Downloadable Documents

Community Information Meeting Invitation (PDF, 397 KB)

Community Involvement and Participation Plan (PDF, 494 KB)

Three Kids Mine Fact Sheet (PDF, 3.23 MB)

Risk Assessment Work Plan, Revision 2 (PDF, 12.3 MB)

Asbestos Survey Report - Revision 2 (PDF, 26.8 MB)

Background Soil Report, Revision 2 (PDF, 6.37 MB)

Data Validation Summary Report: Reporting of Three Kids Mine Background Study Data, Revision 1 (PDF, 890 KB)

Work Plan for Leaching Analysis of Hydro Pit Fill, Revision 1 (PDF, 8.78 MB)

Phase II Sampling and Analysis Plan, Rev. 2 (PDF, 18.9 MB)*

Phase I Environmental Site Assessment (PDF, 10.9 MB)

Three Kids Mine Remediation and Reclamation Act (PDF, 250 KB)

*Appendices are not included due to website file size upload limits. A PDF copy of the full document can be provided upon request.

Additional Information

For more information, please contact Alan Pineda at alan.pineda [at] or 702-668-3925.

To request public records, please submit a Public Records Request Form.

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