2023-07-14_REVISION - M1977342 ‎(2)‎

• Permit No: M1977342
• IBM Index Class Name: Revision
• Doc Date: 7/14/2023
• Doc Name: Adequacy Review Response
• From: Climax Molybdenum Company
• To: DRMS
• Type & Sequence: AM8
• Email Name: PSH
• Email Name: JLE
• Media Type: D
• Archive: No

VWCOLORADO
Division of Water Resources
Department of Natural Resources
Response to Consideration of 112d(3) Hard Rock/Metal Mining Reclamation Permit
Amendment Application
DATE: May 9, 2023
TO: Peter S. Hays, Environmental Protection Specialist
FROM: Javier Vargas-Johnson, Water Resources Engineer
RE: Henderson Mine File No. M-1977-342 - AM08
Applicant/Operator: Climax Molybdenum Company, Inc., [phone]
Sections 23, 24, 25, and 26, Twp 3 South, Rng 76 West, 6th P.M., and Sections 19 and 30,
Twp 3 South, Rng 75 West, 6th P.M., Clear Creek County
Water Division 1, Water District 7
CONDITIONS FOR APPROVAL
0 A Notice of Intent to Construct Monitoring Holes (online a-Form available) should be submitted to
this office at least three days (72 hours) prior to installation of any monitoring holes, or a
Monitoring/Observation Well Permit should be obtained prior to construction of any monitoring
wells.
COMMENTS: The subject application is for an expansion of the affected land in an existing underground
mining operation on 11,877.5 permitted acres located approximately 9 miles west of Empire, Colorado.
The primary commodity mined at the site is molybdenum ore. The application seeks to add 224 acres to
the acreage of the land within the property boundary designated as "Affected Land", however the mining
area is not being expanded. The application does not make any changes to the mining or reclamation
plans.
The proposed activities in this Amendment consist of the construction of roads to install and access
additional water quality monitoring wells. The exact number and location of wells and access roads will
be determined based on geophysical studies and as each new well is installed and more information
becomes available. A Notice of Intent to Construct Monitoring Holes should be submitted to this office
prior to the construction of any monitoring holes or a Monitoring/Observation Well Permit obtained prior
to constructing any monitoring wells. A monitoring hole constructed under a Notice to Intent may be
converted to a monitoring well using the Monitoring/Observation Well Permit Application. Both forms are
available on the eForms section of the Division of Water Resources' website at
https://dwr.state.co.us/eforms?department=6Etsearch=WP. Monitoring holes are required to be plugged
and sealed within eighteen (18) months after construction unless a well permit is obtained. The Notice of
Intent must be submitted three days (72) hours prior to installation of any monitoring holes.
The site water resources are operated under the plan detailed in Technical Revision 16: Henderson
Operations Groundwater Management Plan. The site operates under the augmentation plan decreed in
Division 1 Water Court Case No. 98CW398. The proposed amendment will not affect any additional water
resources beyond those already covered in the augmentation plan.
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1313 SI*men Street, P4*m SZ1, Denver,CO 203 P 3W.Mb-35B1 httpW1dwr.o"aido.W 0
Jared S. Palis,Goverrkar I Dan Gibbs, Executive Director I Ktvin G_ Rein, State EngineerlDimrtor I * *
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