2025-06-23_REVISION - M1980244 ‎(96)‎

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 6/23/2025
• Doc Name: Adequacy Review Response
• From: Cripple Creek & Victor Gold Mining Company
• To: DRMS
• Type & Sequence: AM14
• Email Name: ERR
• Email Name: ZTT
• Media Type: D
• Archive: No

Docusign Envelope ID:45B9721C-FDE2-4821-B686-80BBC79CA6DD
55. Drawing A015 depicts a spillway feature on the northern portion of the crest of the PSSS
embankment. AM14 contains no details regarding this spillway. It appears that this
• spillway will allow solution to drain to unlined areas if the PSSA capacity is exceeded,
however, based on previous VLF designs, internal PSSAs have always drained to lined
areas and into another PSSA in an exceedance scenario. Please explain why a spillway
into VLF1 Phase 4 and VLF1 Phase 5 was not considered. Please also provide details in
Section 4.4.1 of the report on the flow path of a 100% capacity exceedance of the VLF1
Phase 6 PSSA.
The Spillway has been relocated to the VLF1 Phase 4 side slope. Additional discussion on the location
of the spillway has been added to Section 4.4.1.
56. Please identify the location of the backfilled extents of the Elkton Pit on A016. Please also
provide a demonstration the Leak Detection Trenches which pass over the backfill will
maintain positive drainage towards the manhole(s)after maximum project settlement,
otherwise, please discuss how the LDS will be constructed at a steeper grade in this area
to account for the settlement.
Elkton Pit has been removed from Amendment 14. The Leak Detection Trench will not be constructed
on backfilled material.
57. Please remove the demolished facilities within the footprint of the VLF 1 and 2 expansions
on Drawing A017.
The demolished facilities have been removed from Drawing A017.
58. Drawing A011 Ore Stacking Plan and Drawing A018 VLF Cross Section Profiles depict
Cross Section M which passes through VLF2 fully built out and stacked. The sight
• indicator arrows of Cross Section M on A011 and the depicted Cross Section M on
Drawing A018 do not match. Please correct orientation/direction of the sight indicator
arrows of Cross Section M or how Cross Section M is drawn.Additionally, please correct
the vertical existing ground feature near station 39+00 of Cross Section N on Drawing
A018.
The arrow direction on Drawing A011 for Section M has been corrected. The vertical existing ground
feature near station 39+00 of Cross Section N on Drawing A018 has also been addressed.
59. Cross Sections P and Q on Drawing A011 Ore Stacking Plan and Drawing A019 VLF Cross
Section Profiles have been switched. Please correct Cross Sections P and Q.
The section callout has been corrected on A011.
60. Drawing A020 Leak Detection Details contains a Detail D—Typical Solid HDPE to
Perforated CPe Pipe Connection with a drawing reference of Drawing A008. There is no
call out for D/A020 on Drawing A008. Potentially this is meant for Drawing A012, however
no D callout is on this drawing either. Please correct this accordingly.
Section D was added to Drawing A012 and the reference on A020 has been corrected. Section D was
also added to Drawings A014 and A016.
61. Drawing A028 Infiltration Gallery Plan shows a solid line for a 12" pipe located in VLF 2
Phase 4 Stage A area. The legend shows the 12" pipe as a dash-dot line instead of solid.
Please explain if the 12" pipe in VLF 2 Phase 4 Stage A is perforated and if so, update the
Drawing, otherwise the legend may need to be revised to reflect this different pipe type.
• The line type generation of the perforated pipe has been corrected.
SSR Mining Inc. PAGE 15/19