Black Butte Mine was developed in the late 1890s and operated under successive owners until final closure in the late 1960s, ranking as the fourth largest producing mercury mine in Oregon. Mercury contamination has been confirmed in Dennis Creek sediment at 48 ppm, in surface water runoff reaching nearby streams and Cottage Grove Reservoir, and arsenic has been detected in several nearby domestic wells. Oregon DEQ designated the property an Orphan Site in 2002, and the EPA added it to the National Priorities List in March 2010; the site remains under active federal and state oversight as an assigned cleanup project with full remediation still ahead. That history could support an insurance coverage claim against the carriers who issued policies more than 40 years ago — coverage that could help fund the cleanup ahead.
Pre-1986 Commercial General Liability (CGL) policies were occurrence-based and did not contain an effective pollution exclusion in Oregon — and those policies may provide coverage that remains enforceable today. 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 mercury and arsenic contamination at this property traces entirely to mining operations that began in the late 1890s and continued under successive operators until final closure in the late 1960s, placing roughly seven decades of contaminating activity squarely before 1986. The investigation, remediation, and long-term monitoring work that lies ahead — spanning contaminated sediment, surface water pathways, and impacted drinking water wells — represents substantial ongoing and future costs that historical pre-1986 carriers may be obligated to fund going forward.
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.
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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.