2019-06-28_REVISION - M1977004 ‎(9)‎

• 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
4.0 RECLAMATION OBJECTIVES
4.1. Design Objectives
The general objectives for reclamation of the Mine are aimed at restoring the site to a condition
compatible with the final land uses (wildlife and grazing). In addition, HMC has developed a
reclamation plant that requires minimal future maintenance(likely to include ongoing maintenance
of surface water drainages and passive and insitu uranium load reduction systems) with no
year-round active water treatment. In general, post-mining maintenance will be similar to other
private properties in the area.
4.2. Long-term Geotechnical Stability
The average slope in the areas that have been disturbed by mining or reclamation, and which are
to be revegetated with a soil cover, will generally be 2H:1 V. Experience since the mid-1980's has
shown that acceptable reclamation results are obtained on the IRD and TCRD slopes with an
average overall slope of generally 2H:1V. These slopes have been shown to be stable, without
excessive physical or erosional movement.
Areas of the North Pit that have been mapped as tension cracks and scarps will be monitored to
confirm that the area has not exhibited slope movement. The threshold for a reasonable annual
rate of local or global slope movement has been set by BGC at 0.5 ft per year. Slope movements
below this amount are considered typical of landform deformation in the area. Slope movements
greater than this amount will be evaluated, and corrective actions taken as necessary. The rate
of slope movement will be determined from annual inclinometer surveys in the translation zones,
and surveying of surface monuments.
All exposed rock slopes, outside of the existing tension cracks and scarps, have been previously
evaluated to verify that that they are physically stable. These slopes are subject to annual
movement surveys, including Light Detection and Ranging (LIDAR), to confirm the stability. These
exposed rock slopes will not be revegetated, they will be left with a stable configuration (per
Rule 3.1.5(4)).
Any soil or rock slopes which are remediated will be designed to meet a minimum static factor of
safety (FOS) of 1.3.
4.3. Water Quality—Surface and Groundwater
The following subsections describe the objectives for achieving improvements and meeting
applicable criteria for water quality at the Mine and satisfy the requirement for providing Water
Information, per Rule 6.5.7, Exhibit G.
EXHIBIT E-RULE 6.4.5(AMENDED RECLAMATION PLAN) Page 56
HOMESTAKE MINING COMPANY