2. Attachment 1-DQ1 2026-0289.pdf

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Attached to
PKAA, Twin Sisters Mine Closure Project
Solicitation number
DQ1 PKAA 2026000289 2
Issued by
Boulder County, Colorado

About this file

This is a solicitation document (DQ1) from the State of Colorado, Division of Reclamation, Mining and Safety for the Twin Sisters Mine Closure Project. The project encompasses safeguarding and reclamation of 26 mines and 2 maintenance mines located in western Boulder County near Nederland, Colorado, at elevations between 7,000 and 9,000 feet. The mines will be secured using backfilling (20 features), monolithic plugs (1), corrugated steel pipes with bat ladders (3), vertical bat grates (1), and native rock bulkhead with bat access (1). A mandatory pre-bid meeting is scheduled for January 28, 2026 at 10:00 AM. Written inquiries are due by January 29, 2026 at 12:00 PM via email. Bids are due on June 1, 2026 at 4:00 PM, with bid opening occurring on June 2, 2026. The service term runs from April 4, 2026 through January 13, 2027. The contract amount is $169,196.63. Amendment 1 was posted on May 19, 2026, extending the original closing date from May 26, 2026 and modifying attachments including the bid schedule and special conditions.

The scope of work involves restoration and reclamation services on U.S. Forest Service land, Boulder County land, and private mining claims in an area historically mined for tungsten, gold, and silver from the 1860s until the mid-1960s. The project addresses safety hazards from actively collapsing mine openings in an area frequented by recreationalists and inhabited by private property owners. Bidders are required to submit a list of equipment offered and comply with Davis-Bacon wage determinations. The contract includes a Model Construction Agreement with federal provisions. Inquiries should be directed to Teresa Donaldson at the State of Colorado at 303-866-3567, extension 8149, or teresa.donaldson@state.co.us.

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