Industry Day 2025-01-28 RDRA.pdf
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About this file
This is an Industry Day presentation from the EPA regarding the Iron King Mine/Humboldt Smelter Superfund Site cleanup project in Dewey-Humboldt, Arizona. The presentation outlines the operational history, site features, and remediation plans for a former mining and smelting operation that operated from 1910-1970 (mine) and 1880s-1960s (smelter).
The cleanup project involves 15 different areas requiring remediation, with two main repositories planned - one containing 5.2 million cubic yards of waste on the west side (mine) and another with 1.1 million cubic yards on the east side (smelter). The selected remedy includes consolidation of various waste types (mine tailings, waste rock, slag, dross) into repositories and removal/replacement of surface soils in residential areas. The presentation includes before/after visualizations showing the planned remediated state with covered, vegetated repository areas. The EPA has divided this into two contracts: Contract 1 for Remedial Design and Contract 2 for Remedial Action, with the waste planned to remain on its original side of the highway that divides the site.
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Text version
Jeff Dhont, Remedial Project Manager U.S. EPA Region IX
Iron King Mine / Humboldt Smelter Superfund Site Industry Day Remedial Design / Remedial Construction
January 28, 2025
Flagstaff
Phoenix
Tucson
Prescott
ARIZONA
Site Location: Dewey-Humboldt, Arizona
Prescott
Dewey-Humboldt
Operational History
Former Iron King Mine Property
Former Humboldt Smelter Property
Chaparral Gulch
Humboldt Town Proper
Agua Fria River
Iron King Mine:
Operated 1910 -1970 Zinc, Copper, Lead, Gold, Silver Biggest Production 1940s-1950s
Humboldt Smelter
– Making Pure Metals from Ore
Smelting Copper and Lead 2 Predecessor Smelters 1880s - 1904 Main facilities 1905-1937 Biggest Production 1914-1918 Other Operations 1940s, 1950s, 1960s
Val Verde Predecessor Smelter Destroyed by Fire 1904
Non-residential / Waste Areas
Residential Areas
Site Features
Former Iron King Mine Property
Former Humboldt Smelter Property
Waste Types
Mine tailings Waste rock Waste Dross Slag Mixed up tailings, sediments & soils
Wastes
15 Different Areas of Concern Requiring Cleanup
CONTRACT 1:Remedial Design CONTRACT 2: Remedial Action
Open Land North of Pile
Open Land South of Pile
ON THE WEST: THE FORMER IRON KING MINE
Waste Rock
Mine Tailings Pile
Small Tailings Deposits
Small Slag Pile
South Smelter Plateau
ON THE EAST: THE FORMER HUMBOLDT SMELTER PROPERTY
Smelter Tailings Depression
Slag Wall
Dross Waste and Former Smelter
Operations
Heavily Eroded Tailings Depression
Fine-Grained Waste Dross Posi-Shell Cover
Lower Gulch
Upper Gulch
CHAPPARAL GULCH
Tailings Floodplain
Dam
Middle Gulch
Mine Drainage Pathway
Flood Plain (~9 football fields) filled with tailings
Selected Remedy
Waste Areas: Consolidation in Repositories
Residential Areas: Remove and replace surface soils
Selected Alternative: East-West-Based Waste Repositories
R
R
(Waste stays on its side of the highway)
TWO REPOSITORIES
1.1 Million Cubic Yards of Waste
5.2 Million Cubic Yards of Waste
What Might the Mine Tailings Pile Look Like After Cleanup?
BeforeAfter
What Might the Smelter and Gulch Look Like After Cleanup?
Before After
Jeff Dhont, Remedial Project Manager U.S. EPA Region IX
Iron King Mine / Humboldt Smelter Superfund Site Industry Day
January 28, 2025
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File details come from the government source that posted it. Updated .