Industrial & Manufacturing cleanup site — Restorical Research
Sheridan Mine
Wauconda, Okanogan County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a industrial and manufacturing facility going back to 1906. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.

This property operated as a gold and silver mine with ore processing and flotation milling from 1906 through 1920, after which it was abandoned. Multiple adits were developed during its operational period, and the remains of mill buildings are still visible on site today, alongside a large quantity of waste rock left in place from mining and milling activities. Site hazard assessments and investigation reports have been completed, but no active remediation has commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Industrial & Manufacturing
AddressWauconda, Okanogan County
Historical UseIndustrial & Manufacturing
Est. Operating Since1906
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsContamination from historical gold and silver ore processing and milling operations; waste rock deposits remain on site
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #405

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.

Mining and ore processing operations at this site concluded more than six decades before 1986, when pollution exclusions became standard in Commercial General Liability policies. The contamination documented through sampling and hazard ranking at this site is the type of slow-release environmental liability that pre-1986 occurrence-based CGL policies were written to cover. The cleanup costs now facing this property — investigation, remedial design, and eventual remediation of waste rock and mill residues — could plausibly be funded by historical carriers whose policies were in force during the mine's operational years.

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.