Minnesota Administrative Rules
Agency 158 - Natural Resources Department
Chapter 6130 - FERROUS METALLIC MINERAL MINING
TACONITE AND IRON ORE RECLAMATION STANDARDS
Part 6130.2900 - STANDARDS FOR DESIGN AND CONSTRUCTION OF SURFACE OVERBURDEN PORTIONS OF PITWALLS
Universal Citation: MN Rules 6130.2900
Current through Register Vol. 49, No. 13, September 23, 2024
Surface overburden portions of pitwalls shall be designed and constructed to either of the following standards:
A. The final exterior slopes shall consist of benches and lifts as follows:
(1) the toe of
the surface overburden portion shall be set back at least 20 feet from the
crest of the rock portion of the pitwall;
(2) lift heights shall range from 40 to 60
feet and shall be selected based on the need to protect public safety; the
location of the pitwall in relation to the surrounding land uses; the soil
types and their erosion characteristics; the variability of overburden
thickness; and the potential uses of the pit following mining;
(3) the sloped area between benches shall be
no steeper than 2.5:1; and
(4)
benches shall be sloped into the overburden to control runoff. They shall be
large enough to handle runoff water until it can infiltrate into the slope, or
a drainage control system shall be constructed to remove water consistent with
part 6130.2100, items B and C.
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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