A#1 DRUMTenderfootFlatTopWork List.pdf
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- Attached to
- PKAA, DRUM Tenderfoot Flat Top Project
- Solicitation number
- DQ1 PKAA 2027000004 2
- Issued by
- Larimer County, Colorado
About this file
A#1 DRUM Tenderfoot Flat Top Project Feature Work List Summary
This document is a detailed feature work list prepared for the PKAA DRUM Tenderfoot Flat Top Project in Colorado, specifying mine closure and remediation work across multiple sites. The project encompasses closure activities for numerous adit and shaft features distributed across ten distinct mine locations, including Depression 2 & 3, Little Johnny Prospect, Mammoth Prospect, Vanaking 2, Ford 1, Protector Lincoln, Depression Group, Payrock 3, Harvey 1 & 2, Atlas Lone Mesa 1, and Liberty Bell. Work includes backfilling operations using native rock and waste rock, installation of grated corrugated steel pipe (CSP) with bat ladders for adit closure, polyurethane foam (PUF) application for selected features, construction of steel bat grates, and bulkhead seals. The work list identifies 38 individual features across the various sites, with depths ranging from 1 to 11 feet and openings varying from 1 foot by 1 foot to 15 feet by 5 feet. Each feature is assigned a unique ID, closure method, specification reference, UTM coordinates (NAD83), and detailed work description noting maintenance requirements or special considerations such as archeological monitoring.
The document provides comprehensive access descriptions for each site cluster, indicating that most locations require foot access only, with several sites accessible via Highway 141 north of Gateway near specific road intersections (6 3/10 Road, 10 8/10 Road, and 11 3/10 Road). Multiple sites recommend or require helicopter access due to remote locations and difficult terrain, including Depression Group, Payrock 3, and Atlas Lone Mesa 1. Several features require BLM archeological monitoring due to historical eligibility. The work specifications reference standard work specifications (SWS) sections and standard drawings, with closure methods selected based on feature characteristics, drainage conditions, and geological conditions. Some features require maintenance backfill due to previous contractor work settling or erosion. All work is tied to established specifications and drawings that govern corrugated steel pipe adit closure, grated adit closure with bat ladder installation, and general backfill procedures.
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A#1 DRUM Tenderfoot Flat Top – Feature Work List
Feature ID Type Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
420 A1 Depression
2 & 3 Adit
Excavated:4ft by 2ft Eroded:4ft by 2ft Present:4ft by 2ft
Depth:10 ft Lining:Rock Drainage:No
Grated Corrugate d Steel Pipe w Bat
Grate
Install Grated Corrugated Steel Pipe with Bat Ladder in accordance with
CorrugatedSteel Pipe Adit Closure specifications Section 10, SWS Number 5 and
Number 6 sheet 2.
681538.674, 4274124.302
30” diameter CSP, 5’ long Bulkhead Seal
Move boulders before installation
420 A2 Depression
2 & 3 Adit
Excavated:3ft by 1ft Eroded:3ft by 1ft Present:3ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill SWS 2 681534.834, 4274112.180
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock exclude prior to closure
420 A3 Depression
2 & 3 Adit
Excavated:4ft by 1ft Eroded:4ft by 1ft Present:4ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill SWS 2 681480.727, 4273829.974
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock
420 A5 Depression
2 & 3 Adit
Excavated:3ft by 1ft Eroded:3ft by 1ft Present:3ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill SWS 2 681476.983, 4273845.619
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
420 A5b Depression
2 & 3 Adit
Excavated:3ft by 1ft Eroded:3ft by 1ft Present:3ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill SWS 2 681476.983, 4273845.619
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock
420 A5c Depression
2 & 3 Adit
Excavated:3ft by 1ft Eroded:3ft by 1ft Present:3ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill SWS 2 681476.983, 4273845.619
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock
420 A5d Depression
2 & 3 Adit
Excavated:3ft by 1ft Eroded:3ft by 1ft Present:3ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill SWS 2 681476.983, 4273845.619
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock
420 S1 Depression
2 & 3 Shaft
Excavated:6ft by 4ft Eroded:6ft by 4ft Present:6ft by 4ft
Depth:1 ft Lining:Rock Drainage:No
Backfill SWS 2 681622.213,
4274037.680 Backfill using adjacent waste rock
511 P2 Little
Johnny
Pros pect Adit
Excavated:4ft by 5ft Eroded:4ft by 5ft Present:4ft by 5ft
Depth:8 ft Lining:Rock Drainage:No
Bulkhead SWS 14 681853.622, 4279850.837
Historically Eligible BLM Archeological Monitoring
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
513 P4 Mammoth
Pros pect Adit
Excavated:7ft by 3ft Eroded:7ft by 3ft Present:7ft by 3ft
Depth:8 ft Lining:Rock Drainage:No
Modified Backfill w
Polyuretha ne Foam
SWS 2 w 2 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
681446.963, 4279385.399
BLM Archeological Monitoring Dry stack rocks for Backfill at face
521 A1 Vanaking 2 Adit
Excavated:2ft by 3ft Eroded:2ft by 3ft Present:2ft by 3ft
Depth:10 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
681977.508, 4281640.767
521 A2 Vanaking 2 Adit
Excavated:3ft by 4ft Eroded:3ft by 4ft Present:3ft by 4ft
Depth:10 ft Lining:Rock Drainage:No
Grated Corrugate d Steel Pipe w Bat
Grate
Install Grated Corrugated Steel Pipe with Bat Ladder in accordance with
CorrugatedSteel Pipe Adit Closure specifications Section 10, SWS Number 5 and
Number 6 sheet 2.
681969.311, 4281639.655
30” CSP, 5’ long Bulkhead Seal
5887 A1 Ford 1 Adit
Excavated:4ft by 2ft Eroded:4ft by 2ft Present:4ft by 2ft
Depth:9 ft Lining:Rock Drainage:No
Backfill w Poly urethane Foam
SWS 2 w 1 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
680423.917, 4282201.680
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
5892 Subs
Protector Lincoln
Subsid ence
Feature
Excavated:1ft by 1ft Eroded:1ft by 1ft Present:1ft by 1ft
Depth:8 ft Lining:Rock Drainage:No
Backfill w Polyuretha ne Foam
SWS 2 w 1/3 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
681023.666,
4278830.160 exclude prior to closure
5895 A2 Depression
Group Adit
Excavated:2ft by 2ft Eroded:2ft by 2ft Present:2ft by 2ft
Depth:5 ft Lining:Rock Drainage:No
Grated Corr ugated Steel Pipe w Bat Grate
Install Grated Corrugated Steel Pipe with Bat Ladder in accordance with
CorrugatedSteel Pipe Adit Closure specifications Section 10, SWS Number 5 and
Number 6 sheet 2.
681835.985, 4274525.552
30” diameter CSP, 5’ Long Bulkhead Seal
5895 A2b Depression
Group Adit
Excavated:1ft by 1ft Eroded:1ft by 1ft Present:1ft by 1ft
Depth:5 ft Lining:Rock Drainage:No
Backfill w Poly urethane Foam
SWS 2 w 2/3 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
681835.985, 4274525.552
5895 A4 Depression
Group Adit
Excavated:4ft by 2ft Eroded:4ft by 2ft Present:4ft by 2ft
Depth:10 ft Lining:Rock Drainage:No
Backfill w Poly urethane Foam
SWS 2 w 1 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
681800.879, 4274525.987 needs maintenance, previous company backfill settled
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
5895 A5 Depression
Group Adit
Excavated:1ft by 1ft Eroded:1ft by 1ft Present:1ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill w Poly urethane Foam
SWS 2 w 1/3 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
159270.42, 4279722.81 needs maintenance, previous company backfill settled
5895 A6 Depression
Group Adit
Excavated:4ft by 4ft Eroded:4ft by 4ft Present:4ft by 4ft
Depth:10 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
681786.841, 4274525.976
Historically Eligible Archeological Monitoring required
5895 A7 Depression
Group Adit
Excavated:4ft by 1ft Eroded:4ft by 1ft Present:4ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill w Polyuretha ne Foam
SWS 2 w 4 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
681774.240, 4274526.615 needs maintenance, previous company backfill settled
5895 A8 Depression
Group Adit
Excavated:1ft by 1ft Eroded:1ft by 1ft Present:1ft by 1ft
Depth:10 ft Lining:Rock Drainage:No
Backfill w Polyuretha ne Foam
SWS 2 w 2/3 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
681767.789, 4274533.562 needs maintenance, previous company backfill settled
5895 A9 Depression
Group Adit
Excavated:6ft by 3ft Eroded:6ft by 3ft Present:6ft by 3ft
Depth:10 ft Lining:Rock Drainage:No
Backfill w Polyuretha ne Foam
SWS 2 w 1 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
682343.725,
4274103.762 Exclude prior to closure
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
5895 P1 Depression
Group
Pros pect Adit
Excavated:5ft by 5ft Eroded:5ft by 5ft Present:5ft by 5ft
Depth:4 ft Lining:Rock Drainage:No
Backfill w Poly urethane Foam
SWS 2 w 1 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
159604.66, 4279123.97
5895 S1 Depression
Group Shaft
Excavated:6ft by 4ft Eroded:6ft by 4ft Present:6ft by 4ft
Depth:3 ft Lining:Rock Drainage:No
PUF SWS 9 681866.365,
4274371.099
Place 1 ⅓ cuyd PUF at bottom of shaft and cover with adjacent waste rock pile
5896 A1 Payrock 3 Adit
Excavated:5ft by 5ft Eroded:5ft by 5ft Present:5ft by 5ft
Depth:8 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
680601.605, 4283057.302
5896 A3 Payrock 3 Adit
Excavated:3ft by 2ft Eroded:3ft by 2ft Present:3ft by 2ft
Depth:10 ft Lining:Rock Drainage:No
Grated Corr ugated Steel Pipe w Bat Grate
Install Grated Corrugated Steel Pipe with Bat Ladder in accordance with
CorrugatedSteel Pipe Adit Closure specifications Section 10, SWS Number 5 and
Number 6 sheet 2.
680595.909, 4283084.624
30” diameter CSP, 5’ Long Bulkhead Seal
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
5896 P1 Payrock 3
Pros pect Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:9 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
680599.497, 4283064.965
5917 A1 Harvey 1 &
Adit
Excavated:10ft by 1ft Eroded:10ft by 1ft Present:10ft by 1ft
Depth:11 ft Lining:Rock Drainage:No
Backfill SWS 2 684624.588, 4280573.924
Needs maintenance, previous company backfill settled. Backfill using adjacent waste rock
5917 A2 Harvey 1 &
Adit
Excavated:5ft by 6ft Eroded:5ft by 6ft Present:5ft by 6ft
Depth:11 ft Lining:Rock +
Timber Drainage:No
Backfill w Polyuretha ne Foam
SWS 2 w 2 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
684715.931,
4280619.221 exclude prior to closure
5917 P1 Harvey 1 &
Prospe ct Adit
Excavated:4ft by 3ft Eroded:4ft by 3ft Present:4ft by 3ft
Depth:6 ft Lining:Rock Drainage:No
Backfill w Poly urethane Foam
SWS 2 w 1 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
684715.683, 4280619.524
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
6007 A2 Atlas Lone
Mesa1 Adit
Excavated:15ft by 5ft Eroded:15ft by 5ft Present:15ft by 5ft
Depth:8 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
681096.011, 4278114.992
6007 A5 Atlas Lone
Mesa1 Adit
Excavated:5ft by 3ft Eroded:5ft by 3ft Present:5ft by 3ft
Depth:8 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
681130.989, 4278044.84
6007 P1 Atlas Lone
Mesa1
Pros pect Adit
Excavated:5ft by 12ft Eroded:5ft by 12ft Present:5ft by 12ft
Depth:10 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
681086.231, 4278130.192
6007 P2 Atlas Lone
Mesa1
Pros pect Adit
Excavated:3ft by 6ft Eroded:6ft by 6ft Present:6ft by 6ft
Depth:7 ft Lining:Rock Drainage:No
Bat Grate
Construct steel grate with full bat ladder in accordance withGrated Adit ClosureSWS Section 11 and 13, and standard drawings No. 6 sheets 1 and 2.
680791.984, 4278293.164
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description
6436 A4 Liberty Bell Adit
Excavated:6ft by 1ft Eroded:6ft by 1ft Present:6ft by 1ft
Depth:7 ft Lining:Rock Drainage:No
Backfill w Polyuretha ne Foam
SWS 2 w 1 cuyd of PUF and hand backfill to cover PUF with native rock/ waste rock
680461.576, 4278879.121 needs maintenance, previous company backfill eroding
Historically eligible BLM Archeological Monitoring required
6436 P1 Liberty Bell
Prospe ct Adit
Excavated:6ft by 1ft Eroded:6ft by 1ft Present:6ft by 1ft
Depth:7 ft Lining:Rock Drainage:No
Modified Backfill SWS 2 680509.080,
4278960.697 *Dry stack rocks for Backfill at the face
BLM Archeological Monitoring
6436 P2 Liberty Bell
Prospe ct Adit
Excavated:3ft by 3ft Eroded:3ft by 3ft Present:3ft by 3ft
Depth:6 ft Lining:Rock Drainage:No
Modified Backfill w
PUF
SWS 2 680507.432,
4278980.091 *Dry stack rocks for Backfill at the face
BLM Archeological Monitoring
Access Descriptions
Depression
2 & 3
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 11 3/10 Road bear right on 11 3/10 travel 6 miles to sites. Some are foot access only. Large boulder blocking 11 3/10 road- no vehicle access, ATV only. A mini ex could possibly get around boulder and use machine to backfill the features at all 420 and 5895 sites Little
Johnny
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road to unmarked 2 track going south. ½ mile to site. Foot access only
Mammoth
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road to unmarked two track to south east. Foot access only
Vanaking 2 Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road. Foot access only
5887 Ford
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 5.5 miles on 10 8/10 Road to unmarked 2 track going south. ½ mile to site. Foot access only requires an easy 0.2-mile hike along an old drill road from a four-wheel-drive road. Difficult access
Protector Lincoln
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road. to unmarked two track to south east
Depression
Group
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 11 3/10 Road bear right. Large boulder blocking 11 3/10 road- no vehicle access, ATV only. Helicopter recommended
Payrock 3
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road to unmarked two track to north west, 1.5 miles to sites park car. ½ mile Foot access only. Recommend
Helicopter
Harvey 1 &
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road to unmarked 2 track going south. 1½ mile to site. Foot access only
6007 Atlas Lone Mesa
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road. 2 mile hike from 10 8/10 Road is 0.75 mile north of the mine. Helicopter recommended.
Liberty Bell
Access via Highway 141 north of Gateway 6 3/10 Road- 10 miles to intersection with 10 8/10 Road bear right. Travel 6 miles on 10 8/10 Road. Foot access only.
File details come from the government source that posted it. Updated .