6. MineralMountain-Appendix 1.pdf
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- Attached to
- PKAA, Mineral Mountain Mine Closure Project
- Solicitation number
- IFB1 PKAA 2026000104 3
- Issued by
- Colorado
About this file
This document is Appendix 1 of the Mineral Mountain Mine Closure Project specification, prepared for the State of Colorado, detailing feature work lists for mine opening closures and hazardous mine safeguarding activities. The project encompasses two primary work items: Item 4.0 involves the installation of mine closures across multiple mine features, and Item 5.0 addresses safeguarding additional hazardous mine openings. The project includes 17 guaranteed closure features across the Mineral Mountain and surrounding areas (including Pomeroy and Northern sites), with an additional 3 non-guaranteed safeguard features. Work activities include machine backfill, polyurethane foam (PUF) plug installation, adit door closures with bat access provisions, corrugated steel pipe installations, native rock bulkhead construction, and monolithic concrete plugs, depending on specific feature characteristics and depths ranging from 3 feet to 50+ feet.
The closure methods are tailored to each mine opening's physical characteristics, including dimensions, depth, lining composition, and drainage conditions. All work requires implementation of stormwater sediment control measures with biodegradable waddles (25 to 50 linear feet per feature) installed under the Project Manager's direction. Features designated as historically eligible require designated backfill borrow areas flagged by the Project Manager, with strict prohibitions against unauthorized material sourcing. Specific technical specifications are referenced for each closure type, including Sections of Work Standards (SWS) and corresponding drawings. Access constraints are significant, with most features requiring travel along long, rugged roads (2.5 to 4 miles), and some features requiring hand labor or limited machine access due to steep, heavily wooded slopes. Bat exclusion protocols are specified for features with existing drainage, and concrete quality control field sampling is required for monolithic plug installations.
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Appendix 1 Page 1
Appendix 1 – Item 4.0 and Item 5.0 Feature Work Lists
Table 1 - Mineral Mountain – Item 4.0 Install Mine Closures Feature ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
708-110 Adit
Present:8ft by 5ft Depth:60 ft
Lining:Rock + Timber
Drainage:No
Adit Door w/Access
& Bat Ladder
SWS 12, 13
Drawings 6.2, 7
451220.800689134, 4425282.98926352
After clearing portal area, install an adit door closure with full-length bat ladder and access door measuring 4 ft x2 ft minimum in accordance with Adit Door specifications. One six-inch (6”) PVC drainpipe 10 feet long is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM1 Stope
Present:12ft by 12ft Depth:4 ft
Lining:Rock Drainage:No
Machine Backfill SWS 2 450227.743246068, 4423957.77887392
Long rugged road to walk machine in, approximately 2.5 miles. Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM2 Shaft
Present:15ft by 15ft Depth:10 ft Lining:Rock Drainage:No
Machine Backfill SWS 2 450237.2568385, 4423961.41652889
Long rugged road to walk machine in, approximately 2.5 miles. Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM3 Prospect Pit
Present:10ft by 10ft Depth:6 ft
Lining:Rock Drainage:No
Machine Backfill SWS 2 450180.61729913, 4423716.98053128
Long rugged road to walk machine in, approximately 2.5 miles. Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Appendix 1 Page 2
ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
MM4
ELIGIBLE
FEATURE
Shaft
Excavated:6ft by 8ft Eroded:20ft by 10ft
Depth:6+ ft Lining:Rock +
Timber Drainage:No
Modified Machine Backfill
SWS 2, 9.4.2 450218.771245115,
4423710.25633525
Long, rugged road to walk machine in, approx. 2.5 miles.
Remove debris and timbers and stack next to opening. After clearing the site of vegetation, loose rocks and debris, excavate to expose competent material. Place ten (10) cubic yards of PUF at the bottom of the feature to take up space.
After four (4) days of curing time, backfill with onsite material.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER Note: PROJECT MANAGER will flag the area from which backfill may be borrowed. This feature may contribute to a historically eligible site. At NO time shall backfill or borrow material be taken/used from outside the area designated by the PROJECT MANAGER.
MM5
ELIGIBLE
FEATURE
Stope
Present:10ft by 12ft Depth:8 ft
Lining:Rock Drainage:No
Modified Machine Backfill
SWS 2, 9.4.2 450262.46833546,
4423716.75396765
Long, rugged road to walk machine in, approx. 2.5 miles.
Place five (5) cubic yards of PUF at the bottom of the feature to take up space. After four (4) days of curing time, backfill with onsite material
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Note: PROJECT MANAGER will flag the area from which backfill may be borrowed. This feature may contribute to a historically eligible site. At NO time shall backfill or borrow material be taken/used from outside the area designated by the PROJECT MANAGER.
Appendix 1 Page 3
ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
MM6 Prospect Pit
Present:6ft by 8ft Depth:3 ft
Lining:Rock Drainage:No
Machine Backfill SWS 2 450173.577996869, 4423692.66921162
Long rugged road to walk machine in, approximately 2.5 miles. Backfill with onsite material.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM7
ELIGIBLE
FEATURE
Shaft
Excavated:6ft by 4ft Eroded:12ft by 10ft
Depth:40+ ft Lining:Rock +
Timber Drainage:No
Polyureth ane
Foam
SWS 9 450638.498154546,
4423311.33449376
Long rugged road to walk machine in, approximately 3 miles.
Remove timbers and stack next to opening. Install a closure using Polyurethane Foam (PUF). The bottom of the form shall be set at ten (10) feet below the surface. A five (5) foot thick plug using approximately five (5) cubic yards of PUF will be required for this closure. The remainder of the opening will be backfilled with onsite material no earlier than four (4) days after the PUF has been installed.
Note: PROJECT MANAGER will flag the area from which backfill may be borrowed. This feature may contribute to a historically eligible site. At NO time shall backfill or borrow material be taken/used from outside the area designated by the PROJECT MANAGER.
MM8
ELIGIBLE
FEATURE
Stope
Eroded:15ft by 18ft Depth:10+ ft Lining:Rock Drainage:No
Machine Backfill SWS 2 450705.021656492, 4423361.77653353
Long rugged road to walk machine in, approximately 3 miles.
Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Note: PROJECT MANAGER will flag the area from which backfill may be borrowed. This feature may contribute to a historically eligible site. At NO time shall backfill or
Appendix 1 Page 4
ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
MM9 Prospect Pit
Eroded:20ft by 20ft Depth:8 ft
Lining:Rock Drainage:No
Machine Backfill SWS 2 450456.898632887, 4423224.33358626
Long rugged road to walk machine in, approximately 3 miles.
Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM12
ELIGIBLE
FEATURE
Shaft
Excavated:8ft by 8ft Eroded:25ft by 28ft
Depth:30 ft Lining:Rock Drainage:No
Modified Machine Backfill
SWS 2, 9.4.2 451951.761751942,
4423273.64975401
Long, rugged road to walk machine in, approx. 4 miles. After clearing the site of vegetation, loose rocks and debris, excavate to expose competent material. Place twenty (20) cubic yards of PUF at the bottom of the feature to take up space. After four (4) days of curing time, backfill with onsite material. Create a drainage swale to direct water away from the feature.
Storm water sediment control measures shall be implemented prior to work on the closure. Fifty (50) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Note: PROJECT MANAGER will flag the area from which backfill may be borrowed. This feature may contribute to a historically eligible site. At NO time shall backfill or borrow material be taken/used from outside the area designated by the PROJECT MANAGER.
MM13 Stope
Eroded:25ft by 25ft Depth:20 ft Lining:Rock Drainage:No
Modified Machine Backfill
SWS 2, 9.4.2 451896.836701826,
4423255.1887864
Long, rugged road to walk machine in, approx. 4 miles. After clearing the site of vegetation, loose rocks and debris, excavate to expose competent material. Place twenty (20) cubic yards of PUF at the bottom of the feature to take up space. After four (4) days of curing time, backfill with onsite material. Create a drainage swale to direct water away from the feature.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the
Appendix 1 Page 5
ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
MM14 Adit
Excavated:5ft by 5ft Eroded:8ft by 4ft
Depth:50+ ft Lining:Rock
Drainage:Yes
CONTRACT
OR’s
CHOICE
Native Rock
Bulkhead w/ Bat Grate -or-
Grated Corrugat ed Steel Pipe w/
Bat Grate
SWS 13, 14,
Drawing(s) 6.2, -OR-
SWS 10, 13
Drawing(s) 5, 6.2
451845.981197947, 4423355.09710015
Long, rugged road to walk machine in, approx. 4 miles.
Steep, heavily wooded slope access. Limited machine access. Hand dig debris from portal.
CONTRACTOR’s CHOICE Construct a bulkhead closure with onsite rock with bat grate in accordance with Rock Bulkhead Closure Specifications and Bat Grate Alternative Specifications. Access is not required. A 10-ft x 6 inch PVC drainpipe is required.
-OR-
Install a 36-inch diameter ten-foot (10 ft) length of twelve-gauge (12 ga.) corrugated steel pipe (CSP) with bat ladder in accordance with Corrugated Steel Pipe Specifications and Bat Grate Alternative. Access is not required. A drainpipe is not required. Approximately five (5) feet of CSP will be set inside the opening at ground level to allow drainage. The front 3 feet of backfill of the space between the Corrugated Steel Pipe and adit walls requires concreted durable rock that is a minimum of 4 inches in diameter.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM15 Shaft
Present:12ft by 12ft Depth:10 ft
Lining:Rock + Timber
Drainage:No
Machine Backfill SWS 2 450398, 4423847
Long, rugged road to walk machine in, approx. 3 miles.
Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the
Appendix 1 Page 6
ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
N1 Adit/ Decline
Present:6ft by 8ft Depth:6 ft
Lining:Other Drainage:No
Grated Corrugat ed Steel Pipe w/
Bat Grate
SWS 10, 13
Drawing(s) 5, 6.2
452252.964282639, 4425410.87470755
Excavate to determine extents. Haul and properly dispose of any trash found in portal. Install a 36-inch diameter ten foot (10 ft) length of twelve-gauge (12 ga.) corrugated steel pipe (CSP) with bat ladder in accordance with Corrugated Steel Pipe Specifications and Bat Grate Alternative. Access is not required. A drain pipe is not required. Approximately 5 feet of CSP will be set inside the opening. The front 3 feet of backfill of the space between the Corrugated Steel Pipe and adit walls requires concreted durable rock that is a minimum of 4 inches in diameter.
N2 Sink Hole
Present:2ft by 3ft Depth:6 in and growing ft Lining:Rock Drainage:No
Machine Backfill SWS 2 452248.895335831, 4425405.04212454
Excavate to determine extents, backfill with onsite material.
Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Pomeroy
Prospect Pit
Eroded:6ft by 5ft Depth:6 ft
Lining:Rock Drainage:No
Machine Backfill SWS 2 450812.928590285, 4427210.15253686
Machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Pomeroy
ELIGIBLE
FEATURE
Adit/ Decline
Eroded:10ft by 8ft Present:2ft by 3ft
Depth:8 ft Lining:Rock +
Timber Drainage:No
Hand Backfill SWS 2 450924.09174093, 4427421.86833882
Hand backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Note: PROJECT MANAGER will flag the area from which backfill may be borrowed. This feature may contribute to a historically eligible site. At NO time shall backfill or
Appendix 1 Page 7
Table 2 - Mineral Mountain – Item 5.0 Safeguard Additional Hazardous Mine Openings
(NOT GUARANTEED)
Feature ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
CM01 Shaft
Eroded:11ft by 12ft Present:11ft by 12ft
Depth:50 ft Lining:Rock Drainage:No
Monolithic Plug SWS 7 459183.047765307, 4426231.69939292
Remove waste material and dispose of at a county approved landfill. After clearing the site of vegetation, loose rocks and debris, excavate to expose competent material.
Install monolithic plug using eight (8) cubic yards of imported rockfill and nineteen (19) cubic yards of concrete.
The PROJECT MANAGER will collect field quality samples to verify the concrete conforms to the Field Quality Control Specifications. The remainder of the opening will be backfilled with onsite material no earlier than seven (7) days after the concrete has been poured.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
CM02 Shaft
Eroded:9ft by 11ft Present:8ft by 8ft
Depth:35 ft Lining:Rock Drainage:No
Monolithic Plug SWS 7 459197.754388846, 4426099.35302155
BAT EXCLUSION PRIOR TO CLOSING PER SPEC
PROVIDED UNDER ITEM 5.0. Bat Exclusion should be set up 3-7 days in advance of closure work. After clearing the site of vegetation, loose rocks and debris, excavate to expose competent material. Install monolithic plug using five (5) cubic yards of imported rockfill and fifteen (15) cubic yards of concrete. The PROJECT MANAGER will collect field quality samples to verify the concrete conforms to the Field Quality Control Specifications. The remainder of the opening will be backfilled with onsite material no earlier than seven (7) days after the concrete has been poured
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Appendix 1 Page 8
Table 2 - Mineral Mountain – Item 5.0 Safeguard Additional Hazardous Mine Openings
(NOT GUARANTEED)
Feature ID Type
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y) NAD83 Work Description / Notes
MM10 Stope
Eroded:8ft by 8ft Depth:4 ft
Lining:Rock Drainage:No
Machine Backfill SWS 2 451799.891442522, 4423232.98587833
Long rugged road to walk machine in, approximately 4 miles. Machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty five (25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
MM11 Shaft
Eroded:25ft by 20ft Depth:20 ft Lining:Rock Drainage:No
Modified Machine Backfill
SWS 2, 9.4.2 451858.31531618,
4423241.86606239
Long, rugged road to walk machine in, approx. 4 miles.
After clearing the site of vegetation, loose rocks and debris, excavate to expose competent material. Place twenty (20) cubic yards of PUF at the bottom of the feature to take up space. After four (4) days of curing time, backfill with onsite material. Create a drainage swale to direct water away from the feature.
Storm water sediment control measures shall be implemented prior to work on the closure. Fifty (50) linear feet of biodegradable waddles shall be installed on the
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