Designates multiple new wilderness and special management areas in Colorado, creates a BLM pilot program to address fugitive methane from coal mines in the Thompson Divide, and establishes a new national recreation area (Curecanti) with rules for management, land acquisition, recreation, and existing uses. It also sets timelines and conditions for grazing decisions, motorized use for range improvements, land-use studies (including a ski-access study), mapping requirements, mineral withdrawals, and reporting and planning requirements for the methane pilot program.