[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR70.2]

[Page 420-421]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 70--MANDATORY HEALTH STANDARDS--UNDERGROUND COAL MINES--Table of Contents
 
                           Subpart A--General
 
Sec. 70.2  Definitions.

    For the purpose of this part 70, the term:
    (a) Act means the Federal Mine Safety and Health Act of 1977, Pub. 
L. 91-173, as amended by Pub. L. 95-164.
    (b) Active workings means any place in a coal mine where miners are 
normally required to work or travel.
    (c) Certified person means an individual certified by the Secretary 
in accordance with Sec. 70.202 (Certified person; sampling) to take 
respirable dust samples required by this part or certified in accordance 
with Sec. 70.203 (Certified person; maintenance and calibration) to 
perform the maintenance and calibration of respirable dust sampling 
equipment as required by this part.
    (d) Concentration means a measure of the amount of a substance 
contained per unit volume of air.
    (e) Designated area. An area of a mine identified by the operator 
under Sec. 75.371(t) (Mine ventilation plan; contents) of this title and 
approved by the district manager.
    (f) Designated occupation means the occupation on a mechanized 
mining unit that has been determined by results of respirable dust 
samples to have the greatest respirable dust concentration.
    (g) District Manager means the manager of the Coal Mine Safety and 
Health District in which the mine is located.
    (h) Mechanized mining unit means: (1) A unit of mining equipment 
including hand loading equipment used for the production of material; or 
(2) a specialized unit which utilizes mining equipment other than 
specified in Sec. 70.207(e) (Bimonthly sampling; mechanized mining 
units).
    (i) MRE instrument means the gravimetric dust sampler with a four

[[Page 421]]

channel horizontal elutriator developed by the Mining Research 
Establishment of the National Coal Board, London, England.
    (j) MSHA means the Mine Safety and Health Administration of the 
Department of Labor.
    (k) Normal production shift means (1) a production shift during 
which the amount of material produced in a mechanized mining unit is at 
least 50 percent of the average production reported for the last set of 
five valid samples; or (2) a production shift during which any amount of 
material is produced by a new mechanized mining unit, until a set of 
five valid samples is taken.
    (l) Production shift means (1) with regard to a mechanized mining 
unit, a shift during which material is produced, or (2) with regard to a 
designated area of a mine, a shift during which material is produced and 
routine day-to-day activities are occurring in the designated area.
    (m) Quartz means crystalline silicon dioxide (SiO2) not 
chemically combined with other substances and having a distinctive 
physical structure.
    (n) Respirable dust means dust collected with a sampling device 
approved by the Secretary and the Secretary of Health and Human Services 
in accordance with part 74 (Coal Mine Dust Personal Sampler Units) of 
this title. Sampling device approvals issued by the Secretary of the 
Interior and Secretary of Health, Education, and Welfare are continued 
in effect.
    (o) Secretary means the Secretary of Labor or his delegate.
    (p) Valid respirable dust sample means a respirable dust sample 
collected and submitted as required by this part, and not voided by 
MSHA.

[45 FR 24000, Apr. 8, 1980, as amended at 47 FR 28095, June 29, 1982; 57 
FR 20913, May 15, 1992]