Minnesota Administrative Rules
Agency 158 - Natural Resources Department
Chapter 6130 - FERROUS METALLIC MINERAL MINING
TACONITE AND IRON ORE RECLAMATION STANDARDS
Part 6130.2400 - STANDARDS FOR ROCK, LEAN ORE, AND COARSE TAILINGS STOCKPILES
Universal Citation: MN Rules 6130.2400
Current through Register Vol. 48, No. 39, March 25, 2024
Rock, lean ore, and coarse tailings stockpiles, unless they are an integral part of a tailings impoundment, 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 30 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 the angle of repose;
(4) benches shall be designed and constructed
to control runoff;
(5) when
vegetation is required pursuant to part
6130.3600, subpart 2, item D, the
sloped areas between benches shall be prepared to support vegetation;
and
(6) when the sloped area
between benches is covered with surface overburden and vegetated, lifts may be
raised to a maximum of 40 feet.
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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