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Mining Enforcement and Safety Administration
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<p>The Mining Enforcement and Safety Administration (MESA) under the <a href="/facts/U.S._Department_of_the_Interior/uWllgxWx">U.S. Department of the Interior</a> was the predecessor of the <a href="/facts/Mine_Safety_and_Health_Administration/bTNQHAvV">Mine Safety and Health Administration</a>, prior to March 9, 1978. It was formed by the <a href="/facts/Federal_Coal_Mine_Health_and_Safety_Act_of_1969/G950t2aQ">Federal Coal Mine Health and Safety Act of 1969</a>, and co-approved <a href="/facts/Respirators/rYFJThhR">respirators</a> with <a href="/facts/NIOSH/5WjdDNMN">NIOSH</a> under <a href="/facts/NIOSH_air_filtration_rating/H8wTAV8r">30 CFR Part 11</a>. It was dissolved and replaced with <a href="/facts/Mine_Safety_and_Health_Administration/bTNQHAvV">MSHA</a> following the passage of the <a href="/facts/Federal_Mine_Safety_and_Health_Act_of_1977/aY9ewbMD">Federal Mine Safety and Health Act of 1977</a>. </p>