What was once a mining site associated with potentially harmful industrial waste is now making way for neighbourhood parks, walking trails and thousands of homes.
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was → associate → homes
In Henderson, Nevada, a former manganese mine that operated for decades and left behind contamination is being transformed into a large residential community.
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that → operate → community
The opening of Greenbow Park marks a new phase in that redevelopment.
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opening → mark → redevelopment
According to the Nevada Division of Environmental Protection (NDEP), the Three Kids Mine site has been the subject of extensive environmental assessments and a cleanup programme, with the estimated remediation cost reaching approximately $257 million.
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cost → accord → million
From wartime manganese production to an abandoned mining site
The Three Kids Mine has a history dating back more than a century.
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Mine → abandon → history
Manganese ore was discovered at the site in Clark County, Nevada, in 1917.
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ore → discover → 1917
However, mining operations took place intermittently, including between 1942 and 1943 and again from 1953 to 1961.
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operations → take → 1961
Manganese was an important industrial mineral, particularly during World War II, when demand increased for materials used in military equipment and steel production.
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demand → increase → equipment
According to the NDEP, an on-site processing mill was constructed in 1942 to meet the renewed demand for manganese during World War II.
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mill → accord → II
The mill reopened in 1951, and mining resumed in 1953.
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mining → reopen → 1953
Mining continued until the open pits were exhausted, and operations permanently stopped in 1961.
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operations → continue → 1961
The end of mining, however, did not mean the end of the site's environmental problems.
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end → mean → problems
Former mine features included open pits, waste rock, an ore yard, processing facilities and tailings ponds.
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features → include → pits
Environmental assessments identified dust, residues and processing waste containing lead, arsenic, manganese and petroleum.
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assessments → identify → lead
The contamination raised concerns about the condition of the land and the work needed before it could be considered suitable for redevelopment.
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it → raise → redevelopment
Why the cleanup carries a $257 million price tag
The scale of the environmental work is reflected in the estimated cost.
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scale → carry → cost
The NDEP's November 2023 Record of Decision placed the total estimated cleanup cost at approximately $257.5 million.
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Record → place → million
The wider Three Kids Mine property covers around 1,165 acres, although the former mining operations affected a smaller portion of the site.
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operations → cover → site
The area affected by the former mining operations covered approximately 410 acres, distinguishing the contaminated mine area from the larger property earmarked for redevelopment.
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area → affect → redevelopment
Environmental investigations and feasibility studies were undertaken to identify contaminants and determine the appropriate remediation measures.
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investigations → undertake → measures
The federal Three Kids Mine Remediation and Reclamation Act was enacted in July 2014, creating a framework for transferring federally owned land through the City of Henderson Redevelopment Agency so that assessment, remediation and reclamation could take place.
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assessment → enact → place
The land transfer was completed in February 2024, while major cleanup activities began in May 2024.
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activities → complete → May
The NDEP also established a perimeter air monitoring plan to monitor air quality during the work.
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NDEP → establish → work
The contamination identified at the site was not limited to lead and arsenic.
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contamination → identify → lead
Investigations also identified manganese, petroleum-related materials and other industrial waste.
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Investigations → identify → manganese
The environmental work therefore involved addressing several types of contamination rather than simply clearing away the remains of the old mine.
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work → involve → mine
Greenbow Park brings a new public space to the former mine
One of the most visible signs of the transformation is Greenbow Park, a new 3.5-acre recreational space that has opened on the former mine property.
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that → bring → property
According to FOX5 Vegas, the park is part of the Aries master-planned community in Henderson.
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park → accord → Henderson
Its facilities include pickleball courts, playgrounds, shaded gathering areas and more than 3,000 feet of trails.
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facilities → include → trails
Visitors can also enjoy views of the Las Vegas skyline from the walking routes.
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Visitors → enjoy → routes
The park adds recreational space to an area being developed into a residential neighbourhood.
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park → add → neighbourhood
Its opening is significant because the former industrial property is now being incorporated into a community designed around housing, outdoor activities and shared public spaces.
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property → incorporate → housing
Rather than leaving the former mining land as an isolated industrial site, the redevelopment is intended to give it a new role in Henderson's expanding urban landscape.
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redevelopment → leave → landscape
More than 3,000 homes planned across 24 neighbourhoods
Greenbow Park is part of a much larger development plan.
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Park → plan → plan
The Aries master-planned community is expected to include more than 3,000 homes spread across 24 residential neighbourhoods.
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community → plan → neighbourhoods
The redevelopment covers more than 1,100 acres, making it a substantial addition to Henderson's residential growth.
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it → cover → growth
The community is being developed on the former Three Kids Mine property, with housing and recreational facilities planned as part of the wider project.
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community → develop → project
The transformation also highlights the challenges involved in bringing previously industrial land back into urban use.
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transformation → highlight → use
Former mining properties can offer substantial redevelopment opportunities, but their conversion requires careful environmental assessment, remediation and long-term planning.
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conversion → offer → assessment
While Henderson's redevelopment director told the Las Vegas Review-Journal that remediation work had been completed, the NDEP's public project page continues to describe the overall cleanup as ongoing and lists site closure reports and monitoring documents.
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page → tell → reports
…and 2 more, not listed.
The Aporia
