30 CFR § 41.1
Definitions.
As used in this part:
(a) Operator means any owner, lessee, or other person who
operates, controls, or supervises a coal or other mine or any designated
independent contractor performing services or construction at such mine.
(b) Person means any individual, sole proprietor,
partnership, association, corporation, firm, subsidiary of a corporation, or
other organization.
(c) Coal or other mine means (a) an area of land from which
minerals are extracted in nonliquid form or, if in liquid form, are extracted
with workers underground, (b) private ways and roads appurtenant to such
area, and (c) lands, excavations, underground passageways, shafts, slopes,
tunnels and workings, structures, facilities, equipment, machines, tools, or
other property including impoundments, retention dams, and tailings ponds, on
the surface or underground, used in, or to be used in, or resulting from,
the work of extracting such minerals from their natural deposits in
nonliquid form, or if in liquid form, with workers underground, or used in,
or to be used in, the milling of such minerals, or the work of preparing
coal or other minerals, and includes custom coal preparation facilities. In
making a determination of what constitutes mineral milling for purposes of
this act, the Secretary shall give due consideration to the convenience of
administration resulting from the delegation to one Assistant Secretary of
all authority with respect to the health and safety of miners employed at
one physical establishment.
For more information : See MSHA's Program Policy Manual