Twentymile Mine, Sage Creek Portal Water Management
Twentymile Mine, Sage Creek Portal Water Management
2 PagesSmartDitch provides effective stormwater run-off protection for mine entrance. The Twentymile Mine in Routt County, Colorado is one of the largest underground mines in the United States. The Sage Creek portal is a new extension to the mine that provides access to an additional 105 million tons of coal. Challenge The rough terrain, which consisted of steep slopes with rocky soils and minimal ground cover, made the mine site area susceptib
