Input data for mining analyses using MULSIM/NL are derived from web hosting stress-strain properties of
the coal seam and surrounding rock masses, The modulus value of rock masses can be derived
from lab analysis of rock samples, geophysical measurement of rock using stress gauges, and
most commonly, from empirical data collected from known case histories. Similarly, coal seam properties are calibrated in MULSIM/NL using empirical data, although some dedicated hosting lab analysis is useful. The geometry of the area to be mined is obtained from geophysical logs of holes drilled in a grid pattern.