30 CFR § 75.1505
(a) Content and accessibility. An escapeway map shall show the
designated escapeways from the working sections or the miners' work
stations to the surface or the exits at the bottom of the shaft or
slope, refuge alternatives, and SCSR storage locations. The escapeway
map shall be posted or readily accessible for all miners--
(1) In each working section;
(2) In each area where mechanized mining equipment is being
installed or removed;
(3) At the refuge alternative; and
(4) At a surface location of the mine where miners congregate, such
as at the mine bulletin board, bathhouse, or waiting room.
(b) Keeping maps current. All maps shall be kept up-to-date and any
change in route of travel, location of doors, location of refuge
alternatives, or direction of airflow shall be shown on the maps by the
end of the shift on which the change is made.
(c) Informing affected miners. Miners underground on a shift when
any such change is made shall be notified immediately of the change and
other affected miners shall be informed of the change before entering
the underground areas of the mine.