26 U.S. Code § 613 - Percentage depletion | US Law | LII / Legal .(b) Percentage depletion ratesThe mines, wells, and other natural deposits, and the . gravel, peat, pumice, sand, scoria, shale (except shale described in.depletion on sand pits,1. IMPACTS OF SAND MINING - Three issues of sustainable .Depletion of sand in the streambed and along coastal areas causes the . by the two general forms of instream mining: (1) pit excavation and (2) bar skimming.
depletion on sand pits