Minnesota Administrative Rules
Agency 158 - Natural Resources Department
Chapter 6130 - FERROUS METALLIC MINERAL MINING
TACONITE AND IRON ORE RECLAMATION STANDARDS
Part 6130.2700 - STANDARDS FOR SURFACE OVERBURDEN STOCKPILE DESIGN AND CONSTRUCTION
Universal Citation: MN Rules 6130.2700
Current through Register Vol. 48, No. 39, March 25, 2024
Surface overburden stockpiles shall be designed and constructed according to either of the following standards:
A. The final exterior slopes shall consist of benches and lifts as follows:
(1) No lift
shall exceed 40 feet in height.
(2)
No bench width shall be less than 30 feet wide, measured from the crest of the
lower lift to the toe of the next lift.
(3) The sloped area between benches shall be
no steeper than 2.5:1.
(4) Benches
shall be sloped toward the interior to control runoff. They shall be large
enough to handle runoff water until it can be infiltrated into the stockpile,
or a drainage control system shall be constructed to remove water consistent
with part
6130.2100, items B and
C.
(5) Rock, lean ore, or coarse
tailings shall not be used to cover surface overburden stockpiles in order to
avoid compliance with sloping and vegetation requirements. This shall not
preclude the abutting of rock, lean ore, or coarse tailings stockpiles with
surface overburden stockpiles, or the placement of rock, lean ore, or coarse
tailing lifts atop surface overburden pads or lifts.
B. Based upon acceptable research the commissioner shall approve other measures which satisfy part 6130.2000.
Statutory Authority: MS s 93.47
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