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Rio Tinto details dust‑management steps after spike in Copperton monitoring data
Summary
Rio Tinto told the Copperton Town Council it uses water trucks, surfactant and dust spotters to control particulate matter and that a recent PM spike correlated with high winds and a sprinkler failure; the company provided a contact for complaints and plans community open days at its visitor center.
Sean Daley of Rio Tinto presented the company’s dust‑management strategy to the Copperton Town Council on May 21, saying the program relies on coordinated water‑truck operations, a supply plan for surfactant to harden road surfaces, and dedicated dust spotters in high‑priority areas.
Daley said the program has three main elements: operational water trucks that follow prioritized traffic routes, a plan to ensure surfactant is available at fill stands, and spotters who radio production control to deploy water trucks to identified dust sites. "We strategically placed the water stands where those water trucks fill up," Daley said, describing how crews respond when spotters detect visible dust.
Daley walked the council through monitoring graphs showing typical PM10 and PM2.5 readings and flagged a recent high reading tied in the company’s data to a sprinkler/rock‑box incident and a windy period. "We did have that spike there," Daley said, adding that the valley‑wide Hawthorne monitoring station showed similar increases that day. He said Rio Tinto will cease the contributing activity if elevated dust is confirmed and will investigate and fix the source.
The company acknowledged community complaints. Daley said Rio Tinto logged two Copperton complaints year to date (one employee speeding, one dust near the mine, and one permitting‑gap concern across the site) and urged residents to use the dedicated complaint channels: phone (204‑2070) or rtkcomments@riotinto.com, which ensure the report is entered into the firm’s tracking system.
Daley also noted operational upgrades: a rehab/air‑fill vehicle placed into service that can refill air bottles on extended incidents and carry about 50 sets of clean turnouts to reduce firefighter exposure. He invited council members to an upcoming community day at the visitor center and said the company will continue to provide monitoring and quarterly reports to regulators.
The presentation prompted council questions about data correlation and community photos; Daley said Rio Tinto’s Copperton monitor is one data source and that attribution of valley‑wide PM spikes can be complex. Council members were advised to submit photos and videos to staff and the Rio Tinto complaint line for follow up. The council did not take formal action on the presentation.
The council packet will include the presentation materials shown at the meeting for those who requested more detail.
