ABSTRACT
At Bong, there was a strong belief that truck productivity could be improved by installing a centralized control and dispatching system. After system installation and debugging, Bong made use of a statistical method called the Multi-Moment Observation Study or Activity Sampling Survey to estimate improvement due to the system. Using this technique, all pieces of production equipment, in this case shovels and trucks, are observed during random tours around the mine and their activity at that moment is noted. In order to eliminate systematic observation mistakes, tours are made alternatively anti-clock and clockwise. After enough tours, the total results are reliableenough to be a representative for the general mine activities. During a study before system implementation, 120 mine tours were made. Two months after start-up and debugging, 100 mine tours were made. Bong engineering concluded that installation of the system accounted for an increase in productive equipment use of 10%.
