30 C.F.R. § 15.11 – Revocation.

(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.
(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.
(c) Upon request, the approval-holder shall be afforded an opportunity for a hearing.
(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.