2025-02-13_PERMIT FILE - P2025001

• Permit No: P2025001
• IBM Index Class Name: Permit File
• Doc Date: 2/13/2025
• Doc Name: Notice Of Intent
• From: Zephyr Gold USA Ltd
• To: DRMS
• Email Name: JLC
• Email Name: AME
• Email Name: EL1
• Email Name: SMS
• Media Type: D
• Archive: No

•
Ej \II RECEIVE
Environmental FEB 13 •zujj
Alternatives,
Inc. �e Colorado Division of Reclamation;
Mining and Saft y
'ACCREDITP '°
February 12, 2025
Jocelyn Carter
Colorado Division of Reclamation, Mining and Safety
1313 Sherman Street, Room 215
Denver, Colorado 80203
RE: Zephyr Gold USA Ltd (Zephry)
Submission of Notice of Intent(NOI)to Construction Groundwater Monitoring Wells
Dear Ms. Carter,
Please accept this NOI for the construction of groundwater monitoring wells in Sections 13 and
14, Township 19 South, Range 71 West, Fremont County, Colorado.
In December of 2020, Zephyr submitted a 112(d) application for the Dawson Mine proposed in
Fremont County. During review of Exhibit G Water Information, the Division determined that two
groundwater monitoring wells were insufficient to provide an adequate understanding of the groundwater
quality, quantity and connectivity between the sedimentary and Precambrian geologic layers. Zephyr
revised the groundwater monitoring program and Quality Assurance Program Plan (QAPP) under the
Divisions guidance, receiving approval of the plan and QAPP on May 23, 2022(Exhibit A).This NOI reflects
the approved monitoring plan. The following excerpt from the application Exhibit G Section 2.7.4 explains
the proposed monitoring locations.
• Two sets of wells at the upgradient boundary to investigate ground water conditions
entering the affected area. For each set of wells, one well will be completed in the
Precambrian material upgradient of mapped faulting, and one well will be completed in
the sedimentary materials down gradient of mapped faulting. These wells will help define
how the existing faulting impacts ground water flow and ground water conditions entering
the affected area.
• One well in the relative center of the affected area. This well will be completed in the
sedimentary materials and will help investigate how ground water flow and quality may
change as it flows through the affected area.
• One well below all of the surface mine workings. This well will be completed in the
sedimentary materials and will help investigate the impact of the mine workings on the
ground water flow and quality. This will be the last well above the point of compliance well
discussed below.
This monitoring well network represents a more robust monitoring network that will provide
additional data points (compared to the existing wells) to investigate ground water flows (quantity
and quality) beneath the affected area. The wells will provide water level data that can be used to
determine flow direction, monitor water level changes as mining progresses and investigate the
impact of faulting on ground water flow as well as provide the opportunity for water quality
sampling.
Environmental Alternatives,Inc.P.O. Box 326,Canon City,CO 81212 Phone:[phone]
Email:[e-mail]