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Rio Tinto presents dust‑management plan for Copperton, reports three local complaints and visitor‑center reopening
Summary
Rio Tinto told the council it uses water trucks, surfactants and dust spotters to control particulate emissions, cited a short-term sprinkler failure that produced a PM10 spike, and said its visitor center opened to the public May 16 after school visits earlier in the month.
Representatives from Rio Tinto outlined the company’s dust‑management strategy for operations near Copperton and reported community complaints and outreach efforts during the May 21 council meeting.
Sean Daley, who identified himself as representing Rio Tinto’s Carmel team, described what he called the company’s three main dust‑control components: an operational strategy that deploys eight water trucks with strategically sited water stands, a water‑supply and surfactant plan to harden roads and reduce resuspension, and a team of dust spotters who monitor activity from fixed and mobile positions and radio production control to dispatch water trucks when needed.
“The spotters’ sole job is to watch for dust,” Daley said, describing coordination between spotters, supervisors and water trucks. He added that the company can act on community calls through the same dispatch system.
Rio Tinto staff showed monitoring data from a Copperton monitoring station and compared it with the valley Air Quality Division’s Hawthorne station. They noted a spike in particulate matter (PM10) that coincided with a sprinkler issue at a rock‑handling box; the presenter said the spike also correlated with high winds and elevated readings across the valley, not only at the site. The presenters stated the state PM10 limit is 50 (micrograms per cubic meter) and described an internal action threshold that would trigger immediate investigation and corrective action.
The company reported 12 complaints sitewide in the last reporting period and three complaints from Copperton specifically: an employee speeding, dust associated with the rock box (the sprinkler problem discussed in the presentation), and an issue related to stormwater permitting. Daley said the company logs complaints in a campaign tracking system and asked residents to use a designated email address (rtkcomments@riotinto.com) or a phone contact to make sure the concerns are recorded and routed to the right team.
Daley also told the council Rio Tinto’s visitor center reopened to school groups May 1 and opened to the public May 16 after a delayed start. He said the company hosted more than 30 school groups in the two weeks before the public opening and that the site will hold community days later this year.
Why it matters: Copperton residents have repeatedly raised concerns about dust and valley air quality. Rio Tinto’s presentation described operational controls, monitoring, and a complaints process; it also acknowledged a short operational failure that contributed to a short‑term PM spike and outlined steps to respond when monitors or spotters identify elevated particulate levels.
