30 CFR § 33.37 - Test procedure.

---
identifier: "/us/cfr/t30/s33.37"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 33.37 - Test procedure."
title_number: 30
title_name: "Mineral Resources"
section_number: "33.37"
section_name: "Test procedure."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "B"
subchapter_name: "TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS"
part_number: "33"
part_name: "DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 957, 961."
regulatory_source: "Schedule 25B, 25 FR 6473, July 9, 1960, unless otherwise noted."
cfr_part: "33"
---


# 33.37 Test procedure.

(a) Roof drilling: Drilling shall be done in friable strata, similar to the roof in the Bureau's Experimental Mine, which tends to produce large scale-like cuttings.

(b) Horizontal drilling: Drilling shall be done in strata comparable in hardness to that of coal-mine draw slate. Holes shall be started near the roof of the test space under conditions simulating the drilling of draw slate in coal mining.

(c) Down drilling: Drilling shall be done in typical mine floor strata with a pneumatic percussion-type drill. Five holes shall be drilled vertically and five holes shall be drilled at an angle.

(d) At MSHA's discretion drilling in “on site” strata may be acceptable in lieu of strata requirements in paragraphs (a), (b), and (c) of this section. (See § 33.20(a).)