In undercut coal, no hole shall be drilled "on the solid" for any part of its length.
225 ILCS 705/20.33
In undercut coal, no hole shall be drilled "on the solid" for any part of its length
Laws 1953, p. 701.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.