2019-06-28_REVISION - M1977004 ‎(11)‎

• Permit No: M1977004
• IBM Index Class Name: REVISION
• Doc Date: 6/28/2019
• Doc Name: Request For Amendment To Permit
• From: Homestake Mining
• To: DRMS
• Type & Sequence: AM1
• Email Name: DMC
• Email Name: THM
• Media Type: D
• Archive: No

Homestake Mining Company May 10,2019
Regular(112d)Operation Reclamation Permit Application Package
o The Mill Site area grading will be revised to recontour the catchment ponds, sloped
above the pond regraded to slopes ranging from 2H:1V to 2.5H:1V, and the Mill
Site are seeded to grasslands.
o One half of the Haul road from the Mill Site to TCRD will be scarified with a grader
and revegetated.
o Contaminated material from the radium treatment plant will be removed and
disposed of off-site.
o The Limestone quarry will be regraded with 3H:1 V and 2H:1 V slopes to match the
surrounding area and seeded to grass.
o Upon completion of reclamation activities, the Crown Ditch will be breached in
natural drainages to facilitate approximate pre-mining drainage patterns.
o Drainage control or reseeding in Hale Gulch.
o The microwave site will be dismantled and removed offsite.
o Adits and shafts will be closed or sealed with concrete plugs where feasible.
o Miscellaneous building and disposal.
• Pitch Project, Revision Approval, Permit No. M-77-004, Revision No. TR-001;April 7, 1994
(Colorado Division of Minerals and Geology (DMG), 1994a). The Colorado MLRB
approved the technical revision addressing the surface water control plan.
• Pitch Project, Revision Approval, Permit No. M-77-004, Revision No. TR-002; July 27,
1994 (DMG, 1994b). The Colorado MLRB approved the addition of a sediment disposal
cell at the base on the Indian Drainage.
• Pitch Project, Revision Approval, Permit No. M-77-004, Revision No. TR-003; June 12,
1995 (DMG, 1995a). The Colorado MLRB approved the Pinnacle Adit closure by
installation of a concrete plug.
• Pitch Project, Revision Approval, Permit No. M-77-004, Revision No. TR-004; July 17,
1995 (DMG, 1995b). The Colorado MLRB approved the technical revision application
addressing the North Pit closure, the South Pit closure and establishment of the final
permit boundary.
• Pitch Project, Revision Approval, Permit No. M-77-004, Revision No. TR-005;
September 13, 1996 (DMG, 1996). The DMG approved the technical revision application
addressing the construction of a water management embankment in the North Pit Lake.
• Pitch Project, Permit No. M-77-004, Technical Revision (TR-6) Approval; June 25, 2015
CDRMS, 2015). The CDRMS approved the technical revision request to install two
piezometers to facilitate phosphate injection tests.
• Pitch Project, Permit No. M1977-004, Technical Revision (TR-7) Approval; May 19, 2016
(CDRMS, 2016). The CDRMS approved the technical revision request to up to four
piezometers at the toe of the IRD, with construction of associated surface pads; pilot
testing of injection-based strategies (IRD and Underground Mine Workings) for uranium,
mass load reduction to surface water (continuation of 2015 field activities).
• Pitch Project, Permit No. M-77-004, Technical Revision (TR-8) Approval; April 24, 2017
CDRMS, 2017). The CDRMS approved the technical revision request to installation one
exploration borehole at 10500 Erie Drift area, three recirculation/monitoring wells in the
South Pit/underground mine workings area, and five recirculation/monitoring wells in the
EXHIBIT E-RULE 6.4.5(AMENDED RECLAMATION PLAN) Page 6
HOMESTAKE MINING COMPANY