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Cfr

43 C.F.R. § 3598.3 — Service of notices, instructions and orders

The operator/lessee shall be considered to have received all notices and orders that are mailed by certified mail and a receipt received by the authorized officer. Verbal orders and notices may be given to officials at the mine but shall be confirmed in writing in accordance with § 3598.2 of this title.

Official source: www.ecfr.gov