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Kennecott representatives outline new dust controls and a trigger-action plan after Copperton residents report dust and sulfur odors
Summary
Rio Tinto/Kennecott presented dust-mitigation measures including spotters, eight water trucks, surfactant treatments, a trigger-action-response plan and a 24/7 environmental hotline; council members said they want monthly air-quality data and more community reporting tools.
Kennecott and Rio Tinto representatives told the Copperton Town Council they have expanded dust controls at the Copperton concentrator and set up a formal response plan after recent dust events prompted resident complaints. The company said it now operates eight water trucks, dispatches dust spotters near the highway, applies surfactants to haul roads and uses targeted herbicide treatment and vegetative controls near town.
"We implemented what we call a TAR — a trigger-action-response plan," a company environmental representative said, describing a three-tier approach. In the plan, routine conditions are monitored daily; when crews see dust they escalate to a "yellow" response (supervisor engagement and work orders); once dust is observed leaving the property an "orange" response activates managers and superintendent-level fixes to stop off-site impacts.
Council members and residents described recurring haze in town and said episodes sometimes smell strongly of sulfur and leave residue on cars. A council member said the public wants regular, accessible air data. Company staff said the site operates continuous particulate monitors (PM10 and PM2.5), submits quarterly reports to state regulators and will work to provide additional graphs and monthly summaries to the town upon request. They reiterated an environmental hotline is available 24/7 for complaints and said the on-duty hotline handler will return calls within 15 minutes.
Company presenters invited residents to use the hotline and said community reports trigger an internal response that can include extra sprays, targeted watering, or an investigation into operational causes. They said some large dust events prompted full investigations that identified stockpile composition and low concentrator stock as root causes and produced corrective actions.
Council members requested the company produce more frequent summaries and visuals of local monitor readings so the town can assess trends and impacts. Company staff also promoted a community feedback survey ("local voices") and pledged to deliver the survey QR code and monthly monitoring graphs to council staff.
The council did not take a formal vote on the matter but directed staff to follow up on obtaining monthly monitor reports and to publicize the environmental hotline and complaint process.
