You can use the default CYCLONE model here

NAME EARTHMOVING PROCESS LENGTH 1000 CYCLES 30 NETWORK INPUT 1 QUE 'LOADER WT' 2 QUE 'TRUCK WT' 3 COM 'LOAD TRUCK' SET 3 PRE 1 2 FOL 1 4 4 NOR 'TRVL' SET 4 FOL 5 5 QUE 'WAIT SPOTTER' 6 QUE 'SPOTTER STATION' 7 COM 'SPOT & DUMP' SET 7 PRE 5 6 FOL 6 8 8 FUN COU FOL 9 QUA 1 9 NOR 'RET' SET 9 FOL 2 DURATION INPUT SET 3 TRI 1 1.5 2 SET 4 TRI 5 6 7 SET 7 DET 1.5 SET 9 TRI 4 5 6 RESOURCE INPUT 2 'LOADER' AT 1 FIX 60 10 'TRUCKS' AT 2 FIX 25 1 'SPOTTER' AT 6 FIX 30