City of DuPont releases Draft Environmental Impact Statement on North Parcel Mining Proposal
CalPortland in DuPont
CalPortland and its predecessor companies have operated in the DuPont area since 1895 when the Steilacoom mine began operation.
Today, the DuPont facility is recognized as a valuable source of construction aggregates and is the largest producer of high-quality aggregates in the Puget Sound region. DuPont aggregates are among the world’s finest and are used in projects requiring the utmost strength.
Read more about our operation, Our DuPont expansion proposal, and our community involvement.