{
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{
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{
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{
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},
{
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]
}
},
"key_assumptions": [
"Trucks are continuously dispatched while the 8-hour shift is active; throughput is counted only when dumping completes before the shift cutoff.",
"Scenario fleet size selects the first available truck records from trucks.csv; truck availability is treated as deterministic inclusion when greater than zero.",
"Roads with capacity below 999 are modelled as SimPy resources, paired by their two endpoint nodes so opposite directions share a physical constrained segment.",
"Routing uses shortest expected travel time over open directed edges; stochastic travel time is applied after route selection.",
"Loading and dumping times are positive truncated normal samples using the means and standard deviations in the input data."
],
"model_limitations": [
"No truck breakdowns, refuelling, operator shift changes, blasting delays, or maintenance events are modelled.",
"Dispatch uses current queue lengths and mean service times, not a global optimiser or look-ahead controller.",
"Road resource occupancy is first-come, first-served and does not model passing bays, priority rules, or detailed traffic interactions.",
"Crusher feed is represented only by dump service time and a single dumping resource; downstream plant constraints are outside the system boundary."
],
"additional_scenarios_proposed": [
{
"scenario_id": "loader_upgrade_south",
"description": "Test whether a second or faster south-pit loader would unlock more value than adding trucks once the crusher and ramp are near saturation."
}
]
}
summary.json
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