DRUM Little Long North Feature Work List.pdf
PDF 236 KB Posted
- Attached to
- PKAA, DRUM Little Long North Project
- Solicitation number
- DQ1 PKAA 2027000058 3
- Issued by
- Morgan County, Denver City, Colorado
About this file
This is a Feature Work List for the DRUM Little Long North Project in Colorado, detailing mine opening closure work specifications and requirements for multiple sites across the project area. The document outlines 34 distinct work features involving the closure of abandoned mine openings, including adits, shafts, subsidence features, and vents located at sites such as Mesa 3, Modeen, Roosevelt, Inspiration, Yorkton, Early Morn, Windswept, Cycle 3, Lost, Cottonwood, Happy Jack, Little Jewell, Morning Star, Red Bird Yellowbird, and Sylvia. Each feature includes specific closure methods such as bulkheads, bat grates, cable nets, polyurethane foam (PUF) backfill, corrugated steel pipes, and combinations thereof. Work specifications reference Standard Work Specifications (SWS) ranging from SWS 2 to SWS 16 and corresponding standard drawings, with detailed descriptions of mine opening dimensions (both excavated and present conditions), depths, lining materials, and precise UTM coordinates (NAD83) for site locations.
The work list identifies equipment access availability for each site, ranging from no access requiring 400-1,500 foot walks to sites with available equipment access within 100-600 feet. Multiple features are designated as National Register of Historic Places (NRHP) eligible, requiring appropriate consideration during execution. Special site-specific conditions and constraints are documented, including thin roof conditions, bird nests, stacked rock walls, inscriptions, subsidence areas, and environmental considerations such as bat exclusion requirements prior to closure. The project involves hand labor, mini excavator work where permitted, and specialized materials including polyurethane foam quantities ranging from 0.5 to 7 cubic yards per site, corrugated steel pipes in various diameters, and cable netting systems with bat access windows. Notes indicate coordination requirements with the Project Manager, BLM approval for certain access routes, and disposal procedures for removed materials including landfill ticket submission documentation.
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DRUM Little Long North – Feature Work List
Feature ID Type Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
6294 A2 Mesa 3 Adit
Excavated:2ft by 3ft Eroded:2ft by 3ft Present:2ft by 3ft
Depth:11 ft Lining:Rock Drainage:No
Bulkhead
SWS 14
Standard Drawing
678333.7153 16368,
4230129.798 98047
Bulkhead. No equipment access. Closest driving access is 1,500ft away. NRHP eligible.
6294 A4 Mesa 3
Adit
Excavated:4ft by 12ft
Eroded:4ft by 12ft Present:4ft by 12ft
Depth:11 ft Lining:Rock Drainage:No
Bat Grate with Bulkhead
SWS 13
SWS 14
Standard Drawings:
6 (sheet 1 & 2) &
678328.4196 33243,
4230105.010 05195
Bat Grate with Bulkhead on the sides. The roof of the mine is very thin, only 6 inches thick in places, this is where the bulkhead will be needed to help install the grate. No equipment access. Closest driving access is 1,500 feet away. NRHP eligible.
6294 A5 Mesa 3 Adit
Excavated:8ft by 4ft Eroded:8ft by 4ft Present:8ft by 4ft
Depth:1000 ft Lining:Timber Drainage:No
Bat Grate
SWS 13
Standard Drawings:
6 (sheet 1 & 2)
678297.2195 61732, 4230151.510
Bat Grate. No equipment access. Closest driving access is 1,500 feet away. NRHP eligible.
6294 A6 Mesa 3 Adit
Excavated:11ft by 10ft
Eroded:11ft by 10ft Present:11ft by 10ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Cable Net with Bat Window
SWS 13
SWS 16
Standard Drawings:
6 (sheet 1 & 2) &
678331.2074 46905, 4230144.238
Cable net (9ft X 12ft) with bat window. The rocks at the base of the closure will be mortared to provide a stable footer base for pinning cables. Closest equipment access is 1,500 feet away. NRHP eligible.
6294 S2 Mesa 3 Shaft
Excavated:5ft by 6ft Eroded:5ft by 6ft Present:5ft by 6ft
Depth:13 ft Lining:Rock Drainage:No
Grate with Bat Cupola
SWS 8
SWS 13
Standard Drawings:
4 & 6 (sheet 2)
678330.0258 72875,
4230131.568 31509
Grated Shaft Closure with Bat Cupola. Closest equipment access is 1,500 feet away. NRHP eligible.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
6295 A1 Modeen Adit
Excavated:8ft by 5ft Eroded:8ft by 5ft Present:8ft by 5ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Bat Grate
SWS 11
SWS 13
Standard Drawings:
6 (sheet 1 & 2)
677349.4974 64938, 4229608.907
Bat Grate. Equipment access available within 300 feet, park on Modeen access road and walk to the site. Look for birds in the portal before closing - bird nest noted on 4/29/26. NRHP eligible.
6295 A3 Modeen Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Bat Grate
SWS 11
SWS 13
Standard Drawings:
6 (sheet 1 & 2)
677205.7595 6556,
4229381.556 43789
Bat Grate. ATV access available within 400 feet of the site. NRHP eligible.
6295 A4 Modeen Adit
Excavated:4ft by 8ft Eroded:4ft by 8ft Present:4ft by 9ft
Depth:1000 ft Lining:Rock Drainage:No
Backfill with
PUF
SWS 2
SWS 9
677221.9426 33929,
4229364.947 81669
Backfill (hand backfill) with 7 cubic yards of polyurethane foam for plug. Exclude bats prior to closure. Dimensions are 4' X 9'. Set a backform 8 feet inside the mine opening. Backfill the final 3 feet with on-site materials. ATV access available within
400 feet of the mine opening. NRHP eligible.
6298 A2 Roosevelt Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:10 ft Lining:Rock +
Timber Drainage:No
Backfill with
PUF
SWS 2
SWS 9
679208.2821 60312,
4228228.317 79771
Backfill with 2 cubic yards of polyurethane foam for plug. Exclude bats prior to closure. Equipment access within 100 feet.
6309 A1 Inspiration Adit
Excavated:4ft by 4ft Eroded:4ft by 4ft Present:4ft by 4ft
Depth:15 ft Lining:Rock Drainage:No
Backfill with
PUF
SWS 2
SWS 9
688260.6093 28192,
4220423.809 00845
Backfill with PUF plug. Set a backform and pour 2 cubic yards of polyurethane foam then backfill the front 3 feet of the safety closure with onsite materials.
Equipment access to the site is available.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
6311 Subs 1 Magpie No.
Subside nce
Feature
Excavated:3ft by 3ft Eroded:3ft by 3ft Present:3ft by 3ft
Depth:15 ft Lining:Rock Drainage:No
Backfill SWS 2
689384.1406 45784, 4217788.488
Backfill with on site soil for 1 hour with three people.
Equipment access available to the site.
834 A2 Yorkton Adit
Excavated:12ft by 5ft
Eroded:12ft by 5ft Present:12ft by 5ft
Depth: >30 ft Lining:Rock +
Timber Drainage:No
Cable Net
SWS 16
Standard Drawing
683107.8212 7485,
4223627.174 67306
Cable net (no bats) (7' X 13'). Closest ATV access is 500 feet away.
834 A2b Yorkton Adit
Excavated:12ft by 5ft
Eroded:12ft by 5ft Present:12ft by 5ft
Depth: >30 ft Lining:Rock +
Timber Drainage:No
Cable Net
SWS 16
Standard Drawing
683107.8212 7485,
4223627.174 67306
Cable net (no bats) (4' X 4'). Closest ATV access is 500 feet away.
859 A1 Early Morn 3 Adit
Excavated:8ft by 4ft Eroded:8ft by 4ft Present:8ft by 4ft Depth:unknown ft
Lining:Rock Drainage:No
PUF with Bulkhead Facade
SWS 9
SWS 14
Standard Drawing
702093.9807 44186,
4214883.060 52133
Polyurethane foam, set a front form because the hole slopes outwards. Pour 3 cubic yards of PUF and build a one foot thick bulkhead facade on the front of the PUF. Closest equipment access is 300 feet away. ATV crossing of the drainage might require a little work on the path.
885 V1 Windswept Vent
Excavated:1ft by 1ft Eroded:1ft by 1ft Present:1ft by 1ft Depth:unknown ft
Lining:Other Drainage:No
Grate SWS 8
701304.5620 73309, 4215266.976
Grate onto the metal barrel (circular grate).
Equipment access available.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
888 P1 Cycle 3
Prospec t Adit
Excavated:3ft by 3ft Eroded:3ft by 3ft Present:3ft by 3ft
Depth:6 ft Lining:Rock Drainage:No
PUF with Bulkhead Facade
SWS 9
SWS 14
Standard Drawing
687764.0944 68478,
4221020.850 39803
PUF (1CY) with bulkhead facade. Do not disturb stacked rock wall. Remove tumbleweeds. Closest equipment access is 250 feet away on the access road. NRHP eligible.
897 A1 Lost Adit
Excavated:6ft by 5ft Eroded:6ft by 5ft Present:6ft by 5ft
Depth:15 ft Lining:Rock Drainage:No
Backfill with
PUF
SWS 2
SWS 9
687581.4550 43038,
4220139.175 89255
Backfill (hand backfill) with 2CY PUF plug. No equipment access. Closest access is 500 feet away.
914 A1 Cottonwood Adit
Excavated:6ft by 5ft Eroded:6ft by 5ft Present:6ft by 5ft
Depth:20 ft Lining:Rock Drainage:No
PUF with Bulkhead Facade
SWS 14
SWS 9
Standard Drawing
676856.5015 90104,
4229292.206 55054
Recessed bulkhead with PUF backform. Recess the bulkhead at least 2 feet into the opening. Utilize 3 cubic yards of polyurethane foam, then place a 1 foot thick rock bulkhead veneer over the polyurethane foam closure. Equipment access available within
300 feet. NRHP eligible.
914 A2 Cottonwood Adit
Excavated:5ft by 10ft
Eroded:5ft by 10ft Present:5ft by 6ft
Depth:1000 ft Lining:Rock Drainage:No
Grated Corrugated Steel Pipe with Bat Grate and PUF
SWS 10
Standard Drawing 5
& 6 (sheet 2)
676904.3449 64251,
4229230.027 41239
Grated Corrugated Steel Pipe with Bat Grate with 1 CY of PUF and backfill remainder of pipe. 10 foot long 2ft diameter steel pipe. Equipment access available within 200 feet. NRHP eligible.
914 A2b Cottonwood Adit
Excavated:5ft by 10ft
Eroded:5ft by 10ft Present:4ft by 3ft
Depth:1000 ft Lining:Rock Drainage:No
Bulkhead
SWS 14
Standard Drawing
676904.3449 64251,
4229230.027 41239
Bulkhead the 4 X 3 opening. No bat access necessary as 914 A2 will have bat access and the openings are connected. Equipment access available within 100 feet. NRHP eligible.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
914 A3 Cottonwood Adit
Excavated:4ft by 4ft Eroded:4ft by 4ft Present:4ft by 4ft
Depth:1000 ft Lining:Rock Drainage:No
Backfill with
PUF SWS 2
676912.0478 30851,
4229222.793 71627
Hand backfill with 1.5 CY of PUF plug, local material.
Equipment access available within 100 feet. NRHP eligible.
914 A5 Cottonwood Adit
Excavated:6ft by 5ft Eroded:6ft by 5ft Present:6ft by 5ft
Depth:11 ft Lining:Rock +
Timber Drainage:No
Bulkhead
SWS 14
Standard Drawing
676895.7869 64457,
4229086.741 99001
Recessed bulkhead. Equipment access available within 400 feet. NRHP eligible.
916 A1 Happy Jack Adit
Excavated:3ft by 5ft Eroded:3ft by 5ft Present:3ft by 5ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Backfill with
PUF
SWS 2
SWS 9
678223.4851 39182,
4227813.718 96852
Backfill with PUF plug. Pour 5 cubic yards of PUF into the opening after removing the tumbleweeds.
Set a backform in the decline adit and pour the 5 CY.
Backfill with material from within the fenced in area.
Remove the fence and dispose at a landfill. Submit the landfill ticket to the Project Manager. Save the
BLM sign and give to the project manager.
Contractor is also able to use the fill material on the downhill side of the waste rock pile or from the stock pond below the site per Figure 4 and 5 of the CE DD.
Mini excavator allowed, equipment access to the site available. Access route must be approved by the Project Manager before use. Do not drive on the waste rock pile, even near the hole. No disturbance allowed outside of the fenced in area without Project
Manager approval. NRHP eligible.
917 A2 Little Jewell Adit
Excavated:3ft by 2ft Eroded:3ft by 2ft Present:3ft by 2ft
Depth:10 ft Lining:Rock Drainage:No
Backfill with
PUF
SWS 2
SWS 9
678584.7798 41312,
4228840.634 54926
Backfill with PUF plug. Set a backform and pour 1 CY of PUF then backfill front 3 feet. Closest equipment access is 600 feet away.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
917 P1 Little Jewell
Prospec t Adit
Excavated:6ft by 6ft Eroded:6ft by 6ft Present:6ft by 6ft
Depth:8 ft Lining:Rock Drainage:No
Backfill with
PUF
SWS 2
SWS 9
678626.0892 01317,
4228865.908 19373
Backfill with PUF plug. Set a backform and pour 2 CY of PUF then backfill the final 3 feet with onsite materials. No equipment access. Closest access is 400 feet away.
920 A2 Morning
Star Adit
Excavated:3ft by 4ft Eroded:3ft by 4ft Present:3ft by 4ft
Depth:1000 ft Lining:Rock Drainage:No
Backfill with
PUF
SWS 2
SWS 9
677963.8075 88238, 4231171.484
Backfill with PUF. Exclude bats prior to closure. Set a backform and pour 3 cubic yards of PUF then backfill
3 feet of onsite fill materials. Closest access is 100 feet away.
923 A1 Red Bird
Yellowbird Adit
Excavated:3ft by 5ft Eroded:3ft by 5ft Present:3ft by 5ft
Depth:1000 ft Lining:Rock Drainage:No
Grated Corrugated Steel Pipe with Bat
Ladder and
PUF
SWS 10
SWS 9
Standard Drawing 5 & 6 (sheet 2)
677504.0771 4647,
4229996.560 86153
Grated Corrugated Steel Pipe closure with Bat Grate.
30 inch CSP, 10 feet long. Utilize 3 cubic yards of PUF to set the pipe, then backfill the final 3 feet of the closure with on-site fill materials. Equipment access available to the site.
923 A2 Red Bird
Yellowbird Adit
Excavated:8ft by 8ft Eroded:8ft by 8ft Present:8ft by 8ft
Depth:1000 ft Lining:Rock Drainage:No
Grated Corrugated Steel Pipe with Bat
Ladder and
PUF
SWS 10
SWS 9
Standard Drawing 5 & 6 (sheet 2)
677506.8945 72528,
4229990.146 08079
Corrugated Steel Pipe closure with bat ladder. 48 inch diameter CSP, 15 feet long. Utilize 3 cubic yards of PUF to set the safety closure and backfill the final
3 feet around the pipe with onsite fill material.
Equipment access available to the site.
923 Subs2 Red Bird
Yellowbird
Subside nce
Feature
Excavated:23ft by 38ft
Eroded:23ft by 38ft Present:23ft by 38ft
Depth:20 ft Lining:Rock Drainage:No
Backfill with
PUF SWS 2
677530.8554 24029,
4230007.324 44275
Backfill (hand backfill) with PUF. Pour 1/2 a CY of PUF and backfill with 3 feet of onsite materials.
Equipment access available to the site.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
924 A1 Sylvia Adit
Excavated:7ft by 10ft
Eroded:7ft by 10ft Present:7ft by 10ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Cable Net with Bat Window
SWS 16
SWS 13
Standard Drawing 6 (sheet 2) & 13
677291.5652 71292,
4229152.745 80333
Cable net (5' X 15') with bat window. Pin the bottom to large boulders. Backfill the left side opening with large boulders. Equipment access on two track available per BLM. Closest access is 50 feet away.
NRHP eligible.
924 A2 Sylvia Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Cable Net with Bat Window
SWS 16
SWS 13
Standard Drawing 6 (sheet 2) & 13
677295.9577 41543, 4229152.224
Cable net with bat window (4' X 6'). Avoid inscriptions on rock wall. Equipment access on two track available per BLM. Closest access is 50 feet away. NRHP eligible.
924 A3 Sylvia Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Cable Net with Bat Window
SWS 16
SWS 13
Standard Drawing 6 (sheet 2) & 13
677300.8973 57802,
4229148.940 54964
Cable net with bat window (7' x 8'). Install the bat window in a spot where flying will be easy for bats
(make sure the fly way is connected to tunnel directions and that it is higher) . Footer required for cable net in a 3 foot section where there is no bedrock. Equipment access on two track available per BLM. Closest access is 50 feet away. NRHP eligible.
924 A4 Sylvia Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:1000 ft Lining:Rock Drainage:No
Cable Net with Bat Window
SWS 16
SWS 13
Standard Drawing 6 (sheet 2) & 13
677284.5034 49239,
4229152.899 88329
Cable net with bat window (8' X 8'). Pour a 5 foot long footer where there is no bedrock. Ask BLM about driving access on two track. Equipment access on two track available per BLM. Closest access is 50 feet away. NRHP eligible.
924 A5 Sylvia Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:1000 ft Lining:Rock +
Timber Drainage:No
Cable Net
SWS 16
Standard Drawing
677267.1162 49814,
4229157.762 71449
Cable net (10' X 6'). Equipment access on two track available per BLM. Closest access is 50 feet away.
NRHP eligible.
Description of Mine
Opening Closure Method
General Bid Specifications, Standard Work Specification (SWS) and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
924 A6 Sylvia Adit
Excavated:4ft by 6ft Eroded:4ft by 6ft Present:4ft by 6ft
Depth:1000 ft Lining:Rock Drainage:No
Cable Net
SWS 16
Standard Drawing
677264.0959 05162,
4229162.322 68361
Cable net (4' X 8'). Equipment access on two track available per BLM. Closest access is 50 feet away.
NRHP eligible.
File details come from the government source that posted it. Updated .