MSHA - Code of Federal Regulations - 30 CFR 104.3
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MSHA - Title 30 CFR
Sec. 104.3
Issuance of notice.

    (a) When a mine has a pattern of violations, the District Manager will issue a pattern of violations notice to the mine operator that specifies the basis for the Agency's action. The District Manager will also provide a copy of this notice to the representative of miners.
    (b) The mine operator shall post the pattern of violations notice issued under this part on the mine bulletin board. The pattern of violations notice shall remain posted at the mine until MSHA terminates it under Sec. 104.4 of this part.
    (c) If MSHA finds any S&S violation within 90 days after issuance of the pattern notice, MSHA will issue an order for the withdrawal of all persons from the affected area, except those persons referred to in section 104(c) of the Mine Act, until the violation has been abated.
    (d) If a withdrawal order is issued under paragraph (c) of this section, any subsequent S&S violation will result in a withdrawal order that will remain in effect until MSHA determines that the violation has been abated.

For more information: See Pattern of Violations Screening Criteria