30 C.F.R. § 955.12
(a) On-the-job training. Except as provided in § 955.14(c) for reexamination, each applicant for the issuance of an OSM blaster certificate who does not qualify as a blaster or the equivalent shall:
(b) Training course. Except as provided in § 955.14(c) for reexamination, each applicant for the issuance or reissuance of an OSM blaster certificate shall:
(1) Within 2 years prior to submitting an application, have completed a training course as follows: