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Respirable dust levels in coal, metal, and nonmetal mines.

Authors
Watts-WF Jr.; Parker-DR
Source
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, IC 9125, 1987 Jan; :1-23
Link
NIOSHTIC No.
10005545
Abstract
In 1980 the Bureau of Mines developed the mine inspection data analysis system (MIDAS). MIDAS is a computerized, industrial hygiene data base capable of statistically analyzing environmental data collected in coal and noncoal mines and mills by Mine Safety and Health Administration (MSHA) inspectors or mine operators. The objectives of this report are to describe the current contents of midas, to report analyses of coal and noncoal mine respirable dust samples collected by MSHA inspectors, and to evaluate the proposed change in the metal and nonmetal respirable dust standard from a formula based upon the percentage of quartz identified in the sample to 100 ug/m3 of respirable quartz. Based on samples collected by MSHA inspectors, changing the noncoal respirable dust standard would result in 4 pct fewer samples with dust concentrations exceeding the standard. Analysis of respirable coal dust data collected by MSHA inspectors showed that mines with longwall plows or shears had the highest geometric mean concentrations (1.64 and 1.29 Mg/m3, respectively). Mine operations using continuous rippers outnumbered longwall mine operations about 10 to 1 and had a geometric mean concentration of 0.66 Mg/m3.
Publication Date
19870101
Document Type
IH; Information Circular
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
IC-9125
NIOSH Division
TCRC
Source Name
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, IC 9125
State
MN
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