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AMRIZE <br /> August 19, 2025 USPS Certified Mail No. 9589071052702568490672 <br /> RLSJ Properties LLC <br /> Attn: Reggie Golden <br /> P.O. Box 54 <br /> Longmont, CO 80502 <br /> RE: Structure Agreement for Signature—Irwin/Thomas Mine <br /> Dear Structure Owner/Representative: <br /> On January 28, 2024, Holcim Ltd (Holcim) announced its intent to separate and list its North American <br /> business with a full capital market separation (the "Spinoff') to create the leading pure-play building solutions <br /> company in the region. <br /> Final approval for the separation was provided by Holcim shareholders on May 14, 2025. The separation <br /> includes all of the assets and legal entities operating in the US and Canada and was effective as of June 23, <br /> 2025. The new North American business is branded as"Amrize". <br /> In connection with the Spinoff,changes to certain legal entity names will take place.This letter is to inform you <br /> of the corporate name change to Amrize West Central Inc. <br /> As part of this acquisition, Holcim is preparing the DRMS Succession of Operators Application to transfer <br /> Permit No. M-2016-054 from Holcim —WCR, Inc. to Amrize West Central Inc. As part of the permit transfer <br /> process, DRMS requires that all structure agreements are updated to reflect the new quarry ownership. <br /> Please read the attached structure agreement and sign and return the agreement to the following address: <br /> Amrize West Central Inc. <br /> c/o Wyatt Webster <br /> 1687 Cole Blvd., Suite 300 <br /> Golden, CO 80401 <br /> Should you require any additional information, please contact Wyatt Webster at wvatt.websteraamrize.com. <br /> Sincerely, <br /> Wyatt Webster <br /> Land Manager <br /> Amrize West Central Inc. <br /> Attachment: Structure Agreement <br /> 8700 W Bryn Mawr,Chicago 60631 1/1 <br /> T 1 773 372 1000 www.amrize.com <br />