Project Information

Bid Title

PKAA, Twin Sisters Mine Closure Project

Issuing Agency

State Government of Colorado

Location

Colorado

Published Date

May 19, 2026

Closing Date

Jun 1, 2026

Government Level

State & Local

Status

Closed

Ref. #

DQ1-PKAA-2026000289-2

Original Source

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Bid Documents

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Project Description

Description: PKAA, Twin Sisters Mine Closure Project

Department: DNR - Division of Reclamation Mining & Safety

Buyer: Teresa Donaldson

Solicitation Number: DQ1-PKAA-2026000289-2

Type: Documented Quote (DQ1)

Category: Construction

Closing Date and Time: 06/01/2026 04:00 PM MDT

Buyer Information

Buyer Name

Teresa Donaldson

Buyer Email

teresa.donaldson@sta...

Buyer Phone

303-866-3567 X 8149

Buyer Fax

-

Important Dates

Issue Date

01/30/2026

Closing Date

06/01/2026 04:00 PM MDT

Bid Opening Date

-

Last Amended

05/19/2026

Department Information

Category

Construction

Type

Documented Quote

Document Department

PKAA

Status

Amended

Description

PKAA, Twin Sisters Mine Closure Project

Group 1

Default Commodity Group

Number of Lines: 1

Line Number	Extended Description	Commodity Line Description	Details	Requested
1	The Twin Sisters Mine Closure Project is located in western Boulder County in the vicinity of Nederland in mountainous terrain at elevation ranging from 7,000 to 9,000 feet. The Twin Sisters Mine Closure Project includes 26 mines and 2 maintenance mines primarily in the area of Magnolia Rd in western Boulder County. The project area was mined by underground mining methods from 1860's until the mid-1960's for tungsten, gold, and silver. As mining ceased, many of the mine openings remaining from the operations were left in an unsafeguarded condition. The mine openings are located on USFS land, Boulder County land, and private claims. Many of these openings are actively collapsing. The area is popular with recreationalists who hike and bike in the area, camping, hunting, and multiple private land owners who live in and use the area. Mine features will be safeguarded using backfilling (20), monolithic plugs (1), corrugated steel pipes with bat ladders (3), vertical bat grates (1), and native rock bulkhead with bat access (1). The two maintenance features will require backfilling.	Restoration/Reclamation Services of Land and Other Propertie	Specifications Commodity Code 96273	Service From 06/29/2026 Service To 08/12/2026	View Purchase History Additional Information

Commodity Codes

• NAICS 237990Other Heavy and Civil Engineering Construction
• NAICS 541330Engineering Services

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