Protecting Public Health and the Environment.

Preliminary Assessment Program for Mined Lands and Industrial Facilities

In February 2002, DEQ initiated a Preliminary Assessment and Site Inspection Program to evaluate and prioritize assessment of potentially contaminated sites. Idaho has more than 8,500 inactive and abandoned mines, mineral locations, and mineral discoveries. The state also has multiple abandoned or repurposed industrial facilities such as old landfills, repair and maintenance shops, dry cleaners and laundromats, rural airfields, railroad depots, and various manufacturers. Due to accessibility and funding considerations, priority is given to sites where potential contamination poses the most substantial threat to human health or the environment.

The Preliminary Assessment Program is implemented through a cooperative agreement between DEQ and EPA.

Remediation Options

The vast majority of sites assessed by DEQ do not warrant remedial action based on current uses. In the cases where DEQ finds that a substantial risk exists, one of several actions may occur.

  • The current owner or responsible party may voluntarily act to abate or manage risks at the property, although no formal agreement to do so is entered into with the government.
  • If there is a responsible party who is willing to work with DEQ to manage or abate associated risks, the property owner may enter DEQ’s Voluntary Cleanup Program and implement corrective action.
  • If a public entity is willing to take ownership of the site and either abate or manage risks at the site, the property may be a candidate for DEQ's Brownfields Program.
  • None of the property owners who have participated in the program are cleaning up sites due to regulatory action by DEQ; however, DEQ does have the regulatory obligation to address environmental threats and may instigate an administrative action by issuing the responsible party (owner/operator) a Notice of Violation (NOV) consistent with the Hazardous Waste Management Act (HWMA) or Environmental Protection and Health Act (EPHA). After issuing an NOV, DEQ will seek to alleviate the existing threat and may pursue penalties for violations of state law and cost recovery.
  • In the event that no responsible party exists and there is an imminent and substantial threat to human health and/or the environment, DEQ's director may declare a state of emergency. This declaration would allow DEQ to use emergency response funding to hire remediation specialists to clean up the site. Emergency response funds are drawn from penalties imposed on responsible parties who have violated the HWMA.
  • If state funding is unavailable, or the site falls under federal jurisdiction, the site may be placed on EPA National Priority List. EPA then leads the site cleanup effort.

Contact Us

If you would like to find out whether a site in your area poses a possible threat, or provide DEQ with information about a site that you suspect is contaminated, contact your nearest DEQ regional office or the staff contact listed on this web page.

Completed Preliminary Assessments by County

DEQ prepares preliminary assessment and site inspection reports of mine and industrial sites. DEQ's work at the sites listed below is in various stages of progress ranging from looking to acquire legal access to completiing preliminary assessment or site inspection report. Some of the sites listed below may also have links to engineering plans or construction completion reports for remedial action at the site.  Final preliminary assessment or site inspection reports are usually completed by DEQ within 5 to 6 months after a site visit has been conducted.

Note: Listed sites are private properties. Do not enter without the owner's permission. If authorized, avoid contact with hazardous materials and respect the property's historical significance.

Records 101 to 110 of 304
Site NameCountyAssessment TypeAssessment DateDocument Links
Glen Tunnel
(aka Allie Group, Allie Mining Co. Claims, Glen Patent)
LemhiMiningAugust 2010Abbreviated Preliminary Assessment
Gnome Mine and Mill Site
(aka Gnome Mine (International), Prince Group, Prince, Riverside Fraction)
IdahoMiningMarch 2012Abbreviated Preliminary Assessment
Gold Bottom Mine
(aka May Queen, May, Saturn, Modoc Chief, Modick Chief, Good Luck, Hawk, Winona, Highland Chief, Evergreen, Jay Gould Ext., Jay Gould, McLelen, McLelan, Mayflower, Grant Central, War Eagle, and Emma patented mining claims)
BlaineMiningDecember 2009Preliminary Assessment Report
Gold Creek Area Mines
BonnerMiningApril 2019Preliminary Assessment and Site Inspection
Gold Creek Shoshone Silver Mill
BonnerMiningApril 2002Preliminary Assessment and Site Inspection Report

Gold Creek Shoshone Silver Mill Appendices
Gold Hill and Iowa Mines
(aka Gold Hill Iowa Mine; aka Gold Hill, Iowa, Pioneer, Sunday, Confederate, Quartzburg, Granite Creek, and Pioneer Mountain patented mining claims)
BoiseMiningFebruary 2006Preliminary Assessment/Site Inspection Report

Quartzburg Preliminary Assessment

Granite Creek Preliminary Assessment Report
Golden Age Mine
(aka Golden Age Junior Mine; Golden Age, Jr. Mine; aka Theron, Charlotte, Theron Fraction, Francis, Harper, and Florence patented mining claims)
BoiseMiningOctober 2008Preliminary Assessment Report
Good Luck Lode & Mill Site
(aka May Queen, May, Saturn, Modoc Chief, Modick Chief, Good Luck, Hawk, Winona, Highland Chief, Evergreen, Jay Gould Ext., Jay Gould, McLelen, McLelan, Mayflower, Grant Central, War Eagle, and Emma patented mining claims)
BlaineMiningDecember 2009Preliminary Assessment Report
Grace Airstrip
(aka Grace Airport)
CaribouIndustrialDecember 2002Preliminary Assessment Report
Greyhound Mine
(aka General Grant, Birdie, Birdie Mill Site, Rufus Mill Site, Idaho Mill Site, Col. Bernard Mill Site, Ophir Mill Site, Smith Mill Site, Mother Mill Site, Logan Mill Site, Holey Terror Mill Site, General Grant Mill Site, Buck Horn Mill Site, Rufus, Mother, Holey Terror, Col. Bernard, Logan, Margarette, Smith No. 3, and Smith No. 2 patented mining claims)
CusterMiningOctober 1999Preliminary Assessment Report

Greyhound Mine Baseline Water Quality Assessment

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Staff Contacts

Assessment and Compliance Bureau Chief
Dean Ehlert
DEQ State Office
Waste Management & Remediation Division
1410 N. Hilton
Boise, ID 83706
(208) 373-0416

DEQ Guidance

Gilmore Townsite Health and Safety Fact Sheet

Related Mining Reports

Related Pages

Brownfields in Idaho

Voluntary Cleanup Program