This property has a documented history as a industrial and manufacturing facility going back to 1893. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.
The Bonanza Mine operated as a lead, silver, zinc, and copper mine in Stevens County's Bossburg Mining District from 1893 through approximately 1954, historically producing nearly one-fifth of all lead and one-sixth of all silver mined in the county. Regulatory records document preliminary site activities including removal of waste rock by Stevens County Public Works at 1,800 cubic yards per day, over-excavation of lead-contaminated rock, and screening of waste rock to less than three inches. The site is currently listed in Awaiting Cleanup status under Washington Ecology's Standard Cleanup program, with formal remediation not yet commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.
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.
Contamination at this property — lead, arsenic, and associated heavy metals from more than six decades of extraction and waste rock disposal — originated entirely from mining operations that concluded well before 1986. Occurrence-based CGL policies issued to the mine operators during its active years carried no effective pollution exclusion in Washington and remain enforceable today. The investigation and cleanup costs now facing this site — waste rock management, contaminated-soil excavation, and long-term remediation of heavy metals across the surrounding area — represent expenditures that historical 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
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Contact UsThis analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.


