---
kind: "section"
citation: "30 C.F.R. § 33.37"
title: "30"
number: "33.37"
heading: "Test procedure."
url: "https://uscodex.org/cfr/30/33.37"
---

# §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)](#a), [(b)](#b), and [(c)](#c) of this section. (See [§ 33.20(a)](/cfr/30/33.20.md?p=a).)

## Notes

### Authority

Authority: 30 U.S.C. 957, 961.

### Source

Source: Schedule 25B, 25 FR 6473, July 9, 1960, unless otherwise noted.