2018-10-15_REPORT - M1980244

• Permit No: M1980244
• IBM Index Class Name: Report
• Doc Date: 10/15/2018
• Doc Name: Construction Quality Assurance Report ‎(CQA)‎ Response to Comments
• From: CC&V
• To: DRMS
• Type & Sequence: TR100
• Email Name: TC1
• Media Type: D
• Archive: No

NEWMONT Newnont Miranc Corporation
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Electronic Delivery
October 10, 2018
Mr. Timothy Cazier, P.E. OCT 5 Zola
Environmental Protection Specialist %DIV1s101VOF�€�
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Colorado Department of Natural Resources ''A0�' ON
Division of Reclamation, Mining, and Safety
Office of Mined Land Reclamation
1313 Sherman Street, Room 215
Denver, Colorado 80203
Re: Cripple Creek & Victor Mining, Co., Cresson Project, M-1980-244; Review of Record of
Construction Report, VLF2 Recertification Report, Subgrade and Geomembrane 9750 —
9900' Elevations; Second Adequacy Review Response
Dear Mr. Cazier:
On April 10, 2018, the Cripple Creek and Victor Gold Mining Company (CC&V) submitted a
Technical Revision (TR) #100 proposing to conduct a liner integrity investigation in the
immediate area impacted by the Squaw Gulch Valley Leach Facility(VLF2) slough. On October
3, 2018, CC&V received Preliminary Adequacy Review (PAR) comments from the Division of
Reclamation, Mining and Safety (DRMS) for the VLF2 Recertification Report, Subgrade and
Geomembrane 9750-9900' Elevations. On October 5, 2018 CC&V submitted a response to the
PAR. A second Adequacy Review was received from DRMS on October 9, 2018. Please see the
responses below to address the outstanding adequacy concerns; DRMS' comments in italics with
Newmont's response to comments in bold.
Field Daily Progress Report August 7 through 11, 2018: The response was not adequate. The
response states "small holes were punctured into the geomembrane liner"during the relocation
of the 9850 header pipe. The response paragraph immediately following this statement indicates
repairs included "geomembrane patches over large holes", as well as "geomembrane beading
the smaller holes". Finally, the third paragraph in this response states the narrative was
completed prior to the repairs being completed. A review of documents submitted to the Division
found a May 3, 2018 letter addressing the "Follow-Up—Header Removal". The letter states
1,000 feet of the 9850 header pipe was removed on April 27, 2018, but does not mention any
damage to the geomembrane liner during the process. This October 5, 2018 response narrative
raises the following additional concerns: