30 CFR § 72.520 Diesel equipment inventory.
(a) The operator of each mine that utilizes diesel equipment
underground, shall prepare and submit in writing to the District
Manager, an inventory of diesel equipment used in the mine. The
inventory shall include the number and type of diesel-powered units
used underground, including make and model of unit, type of equipment,
make and model of engine, serial number of engine, brake horsepower
rating of engine, emissions of engine in grams per hour or grams per
brake horsepower-hour, approval number of engine, make and model of
aftertreatment device, serial number of aftertreatment device if
available, and efficiency of aftertreatment device.
(b) The mine operator shall make changes to the diesel equipment
inventory as equipment or emission control systems are added, deleted
or modified and submit revisions, to the District Manager, within 7
(c) If requested, the mine operator shall provide a copy of the
diesel equipment inventory to the representative of the miners within 3
days of the request.