Page 82 - Advances In Productive, Safe, and Responsible Coal Mining

68 Advances in Productive, Safe, and Responsible Coal Mining

Fig. 5.3 Haulage unit dumping time.

Fig. 5.4 Empty haulage unit travel speed.

Fig. 5.5 Loaded haulage unit travel speed.

deemed valid if the predicted output is within 15% of actual levels achieved by the
mine. Input data used to validate the model was obtained from time studies conducted
at the mine (Figs. 5.3–5.8). These raw data were analyzed to fit statistical distribu-
tions using the chi-squared goodness-of-fit test, as shown in Table 5.1. Input data
included loading and dumping times, payloads, and battery change data, which are
sampled from these distributions. Input data was selected to reflect loading, hauling,
and dumping logic. Besides production rate, other model outputs include production