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Minnesota Legislature

Office of the Revisor of Statutes

6130.2400 STANDARDS FOR ROCK, LEAN ORE, AND COARSE TAILINGS STOCKPILES.

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

Published Electronically:

June 11, 2008