US: Boulder County has initiated action to terminate the operating licence of the Cemex cement plant near Lyons, Colorado, citing improper expansion of use. Dale Case, director of Boulder County Community Planning and Permitting, sent a notice to the company, motivated by a ‘significant’ rise in traffic. The letter said that the increased traffic created a need for new traffic construction and infrastructure, and requires a new access permit from the Colorado Department of Transportation (CDOT).

The plant has been operational since 1965, but faced changes in 1994 when Boulder County amended its land use code, necessitating special use approval for open mining at the Dowe Flats Quarry. The special use approval for the quarry expired on 30 September 2022, leading to termination of all mining operations and multiple complaints alleging the cement plant's non-compliance with county code and traffic congestion. A CDOT study revealed an increase in truck traffic since the quarry's closure, with daily trips increasing by 50% year-on-year.

Cemex now has a 30-day window to contest the director's determination, reduce plant use, or appeal to the Boulder County Board of Commissioners. The plant will continue operating under existing conditions until a final decision is reached.