30 CFR § 77.1200
Mine map.
The operator shall maintain an accurate and up-to-date map of the mine, on a
scale of not less than 100 nor more than 500 feet to the inch, at or near the
mine, in an area chosen by the mine operator, with a duplicate copy on file
at a separate and distinct location, to minimize the danger of destruction by
fire or other hazard. The map shall show:
(a) Name and address of the mine;
(b) The property or boundary lines of the active areas of the
mine;
(c) Contour lines passing through whole number elevations of the
coalbed being mined. The spacing of such lines shall not exceed 25-foot
elevation levels, except that a broader spacing of contour lines may be
approved by the District Manager for steeply pitching coalbeds. Contour
lines may be placed on overlays or tracings attached to mine maps.
(d) The general elevation of the coalbed or coalbeds being mined, and
the general elevation of the surface;
(e) Either producing or abandoned oil and gas wells located on the
mine property;
(f) The location and elevation of any body of water dammed or held
back in any portion of the mine: Provided, however, Such bodies of
water may be shown on overlays or tracings attached to the mine maps;
(g) All prospect drill holes that penetrate the coalbed or coalbeds
being mined on the mine property;
(h) All auger and strip mined areas of the coalbed or coalbeds being
mined on the mine property together with the line of maximum depth of holes
drilled during auger mining operations.
(i) All worked out and abandoned areas;
(j) The location of railroad tracks and public highways leading to
the mine, and mine buildings of a permanent nature with identifying names
shown;
(k) Underground mine workings underlying and within 1,000 feet of the
active areas of the mine;
(l) The location and description of at least two permanent base line
points, and the location and description of at least two permanent elevation
bench marks used in connection with establishing or referencing mine
elevation surveys; and,
(m) The scale of the map.
