Industrial & Manufacturing cleanup site — Restorical Research
Sierra Zinc Mine
Colville, Stevens County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a industrial and manufacturing facility going back to 1889. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

Lead and zinc mining and milling operations at this Stevens County site began in 1889 and continued sporadically through the mid- to late 1970s, leaving a 25-acre tailings impoundment and extensive contaminated soils and mine wastes. Remediation carried out between 2014 and 2016 involved excavating 88,000 cubic yards of contaminated material into an on-site impoundment, capping it with 106,000 cubic yards of engineered clean cover soils, demolishing structures, re-contouring the site, and completing revegetation at a construction cost of approximately $1.3 million. The site is now in the performance-monitoring phase, with continued oversight governed by an environmental covenant and periodic reviews. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Industrial & Manufacturing
AddressColville, Stevens County
Historical UseIndustrial & Manufacturing
Est. Operating Since1889
StatusConstruction Complete — Performance Monitoring
Contamination & Investigation
Site Assessment Summary
ContaminantsLead and zinc in contaminated soil, mine wastes, and tailings
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #1838

Why Historical Insurance Policies May Be Accessible

Pre-1986 Commercial General Liability (CGL) policies were occurrence-based and did not contain an effective pollution exclusion in Washington. If contamination occurred while those policies were active, those historical insurance carriers may still have a legal obligation to fund the cleanup costs, even if the business closed or the property changed hands.

The lead and zinc contamination at this property — embedded in nearly a century of accumulated tailings and mine wastes — originated entirely from industrial extraction and milling operations that predated 1986 by decades. Occurrence-based Commercial General Liability policies issued to mine operators during that pre-1986 window had no effective pollution exclusion and remain potentially enforceable. The $1.3 million construction remediation and the continuing monitoring obligations it created are precisely the category of long-tail environmental liability that historical CGL carriers may be obligated to fund.

Restorical's role is to locate viable historical policies, determine whether a successful coverage claim is possible, and assist our clients and their legal counsel to obtain insurance coverage. Restorical then manages the claim, including accounting, to ensure the cleanup is funded in a timely manner.

What We Look For

  • Historical insurance policies (pre-1986)
  • Policy numbers, carrier names, and coverage periods
  • Connection between contamination timing and policy period
  • Evidence linking cleanup obligation to insured activity

What We Deliver

  • Historical Coverage Chart
  • Trigger Analysis & Property/Policy Nexus
  • Coverage strategy with recommendations
  • Insurance funding for your remediation
  • Claims Management & Forensic Accounting

The Restorical Proven Process

Task 1 — Research and Analysis
Restorical searches for viable historical insurance policies, researches the site history, analyzes the contamination impacts, and underwrites potential coverage — including a proprietary trigger analysis. At the end of Task 1, we provide a clear yes or no on whether a successful cost recovery is possible, along with a strategy and recommendation specific to your situation, even if you are not the policyholder.
Task 2 — Coverage and Funding
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim, negotiate and secure insurance coverage. Restorical will manage the ongoing claim process, including accounting to ensure the insurance companies are funding your remediation in a timely manner.

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This analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.