The owners of Glenwood Springs’ two major hot springs attractions say a proposed mining expansion could ruin the centuries-old attractions — and not just because it could affect the views from town. In comments to the Bureau of Land Management, Iron Mountain Hot Springs and the Glenwood Hot Springs Lodge and Pool wrote that RMR Industrial’s proposed limestone quarry expansion “will obliterate source waters feeding these springs.” The hot springs owners, as well as cave experts, worry that five wells RMR plans to drill for a baseline study could irreparably damage the fragile and complex geothermal structures that feed the hot springs. Groundwater flows down through caves and is heated by magma, then pushed up as hot springs.