2017-03-24_REVISION - M1977004

• Permit No: M1977004
• IBM Index Class Name: Revision
• Doc Date: 3/24/2017
• Doc Name: Request for Technical Revision
• From: Homestake Mining Company
• To: DRMS
• Type & Sequence: TR8
• Email Name: SJM
• Email Name: GRM
• Media Type: D
• Archive: No

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DPITCH RECLAMATION PROJECT
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March 24, 2017
Mr. Dustin Czapla
Environment Protection Specialist
Colorado Division of Reclamation, Mining and Safety
101 South 3rd, Suite 301
Grand Junction, Colorado 81501
Phone: [phone]
[e-mail]
RE: 2017 Field Activities to Support Establishment of the Lowest Practical Level
for Uranium, Pitch Reclamation Project, Colorado Division of Reclamation,
Mining and Safety Reclamation Permit Number M-1977-004
Dear Mr. Czapla:
a Homestake Mining Company (HMC) is continuing to advance the evaluation of
alternatives that can be implemented at the Pitch Reclamation Project (Figure 1 and
Figure 2) to reduce uranium load to the Colorado Discharge Permit System (CDPS)
permit (No. C00022756) compliance point Outfall 001A (also known as SW -33) and
a establish the Lowest Practical Level (LPL) for uranium. Pilot testing in 2015 and 2016
involving the injection of a mixture of phosphate and conservative tracer into the historical
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Pinnacle underground mine workings and the Indian Rock Dump was successful at
treating uranium by precipitation as low -solubility phosphate -based minerals. Phosphate
and non-reactive tracer injections were completed using existing and recently completed
injection/monitoring wells as approved in previous technical revisions (TR -6 and TR -7) to
the Colorado Division of Reclamation, Mining and Safety (DRMS) reclamation permit (No.
M-1977-004).
Building on the success of the 2015 and 2016 injection pilot tests, and in the interest of
continued evaluation of potential alternatives to address the other uranium source loads,
the following field activities are planned for 2017:
• Installation of up to eight reagent injection/recirculation/monitoring wells including:
o Three wells in and around the underground mine workings
o Five wells in the Indian Rock Dump
• Drilling of an additional exploration borehole in the underground mine workings to
characterize the Erie Drift.
• Expanded phosphate -based injections into the underground mine workings and
Indian Rock Dump. Associated activities will include the installation of piping and
Homestake Mining Company + PO Box 40, Sargents, Colorado 81248