30 CFR §15.11

1. (a)MSHA may revoke for cause an approval issued under this part if the explosive or sheathed explosive unit—
   1. (1)Fails to meet the applicable technical requirements; or
   2. (2)Creates a hazard when used in a mine.
2. (b)Prior to revoking an approval, the approval-holder shall be informed in writing of MSHA's intention to revoke. The notice shall—
   1. (1)Explain the specific reasons for the proposed revocation; and
   2. (2)Provide the approval-holder an opportunity to demonstrate or achieve compliance with the product approval requirements.
3. (c)Upon request, the approval-holder shall be afforded an opportunity for a hearing.
4. (d)If an explosive or sheathed explosive unit poses an imminent hazard to the safety or health of miners, the approval may be immediately suspended without a written notice of the agency's intention to revoke. The suspension may continue until the revocation proceedings are completed.