A Fourier transform infrared spectrophotometric method was described for the determination of quartz, mica(sericite) and feldspar(potassium feldspar) in respirable dust in Taebaek area. The results were as follows; 1) The concentration of minerals were determined from the intensity of absorption peak of quartz at $799cm^{-1}$, sericite at $539cm^{-1}$, and potassium feldspar at $648cm^{-1}$ respectively. 2) The precision(C. V. %) for the quartz determination was $7.70{pm}2.68%$ from 10 to $200{mu}g$ of quartz. 3) The precision for the sericite determination was $16.34{pm}6.82%$ from 30 to $500{mu}g$ of serictite. 4) The precision for the potassium feldspar determination was $5.28{pm}1.74%$ from 30 to $500{mu}g$ of potassium feldspar. 5) The concentration of respirable dust in Taebaek area was $4.90{pm}3.29mg/m^3$ (0.4-93.7%), percent quartz was $1.80{pm}4.14%$ (0.01-20.56%), percent sericite was $11.37{pm}6.43%$ (0.00-29.69%), percent potassium feldspar was 8.15% (n=7, 3.41-19.70%). 6) The difference of respirable coal dust, quartz, and sericite concentrations in drilling, coal cutting, hauling and seperating was significant respectively (p<0.05).