summary.json

{
  "benchmark_id": "001_synthetic_mine_throughput",
  "scenarios": {
    "baseline": {
      "replications": 30,
      "shift_length_hours": 8.0,
      "total_tonnes_mean": 12446.67,
      "total_tonnes_ci95_low": 12362.46,
      "total_tonnes_ci95_high": 12530.87,
      "tonnes_per_hour_mean": 1555.833,
      "tonnes_per_hour_ci95_low": 1545.308,
      "tonnes_per_hour_ci95_high": 1566.359,
      "average_cycle_time_min": 29.914,
      "truck_utilisation_mean": 0.0,
      "crusher_utilisation": 0.9066,
      "average_loader_queue_time_min": 2.58,
      "average_crusher_queue_time_min": 3.84,
      "top_bottlenecks": [
        "Crusher highly utilised (90.7%)",
        "Long crusher queue (avg 3.8 min wait)",
        "Long loader queue (avg 2.6 min wait)"
      ]
    },
    "trucks_4": {
      "replications": 30,
      "shift_length_hours": 8.0,
      "total_tonnes_mean": 8163.33,
      "total_tonnes_ci95_low": 8124.75,
      "total_tonnes_ci95_high": 8201.92,
      "tonnes_per_hour_mean": 1020.417,
      "tonnes_per_hour_ci95_low": 1015.593,
      "tonnes_per_hour_ci95_high": 1025.24,
      "average_cycle_time_min": 22.965,
      "truck_utilisation_mean": 0.0,
      "crusher_utilisation": 0.5921,
      "average_loader_queue_time_min": 0.955,
      "average_crusher_queue_time_min": 0.304,
      "top_bottlenecks": [
        "No severe bottleneck detected"
      ]
    },
    "trucks_12": {
      "replications": 30,
      "shift_length_hours": 8.0,
      "total_tonnes_mean": 12676.67,
      "total_tonnes_ci95_low": 12579.25,
      "total_tonnes_ci95_high": 12774.08,
      "tonnes_per_hour_mean": 1584.583,
      "tonnes_per_hour_ci95_low": 1572.407,
      "tonnes_per_hour_ci95_high": 1596.76,
      "average_cycle_time_min": 43.437,
      "truck_utilisation_mean": 0.0,
      "crusher_utilisation": 0.9239,
      "average_loader_queue_time_min": 4.18,
      "average_crusher_queue_time_min": 14.846,
      "top_bottlenecks": [
        "Crusher highly utilised (92.4%)",
        "Long crusher queue (avg 14.8 min wait)",
        "Long loader queue (avg 4.2 min wait)"
      ]
    },
    "ramp_upgrade": {
      "replications": 30,
      "shift_length_hours": 8.0,
      "total_tonnes_mean": 12466.67,
      "total_tonnes_ci95_low": 12383.85,
      "total_tonnes_ci95_high": 12549.49,
      "tonnes_per_hour_mean": 1558.333,
      "tonnes_per_hour_ci95_low": 1547.981,
      "tonnes_per_hour_ci95_high": 1568.686,
      "average_cycle_time_min": 29.866,
      "truck_utilisation_mean": 0.0,
      "crusher_utilisation": 0.9084,
      "average_loader_queue_time_min": 2.58,
      "average_crusher_queue_time_min": 3.842,
      "top_bottlenecks": [
        "Crusher highly utilised (90.8%)",
        "Long crusher queue (avg 3.8 min wait)",
        "Long loader queue (avg 2.6 min wait)"
      ]
    },
    "crusher_slowdown": {
      "replications": 30,
      "shift_length_hours": 8.0,
      "total_tonnes_mean": 6423.33,
      "total_tonnes_ci95_low": 6355.62,
      "total_tonnes_ci95_high": 6491.05,
      "tonnes_per_hour_mean": 802.917,
      "tonnes_per_hour_ci95_low": 794.452,
      "tonnes_per_hour_ci95_high": 811.381,
      "average_cycle_time_min": 56.285,
      "truck_utilisation_mean": 0.0,
      "crusher_utilisation": 0.937,
      "average_loader_queue_time_min": 1.855,
      "average_crusher_queue_time_min": 28.182,
      "top_bottlenecks": [
        "Crusher highly utilised (93.7%)",
        "Long crusher queue (avg 28.2 min wait)"
      ]
    },
    "ramp_closed": {
      "replications": 30,
      "shift_length_hours": 8.0,
      "total_tonnes_mean": 12446.67,
      "total_tonnes_ci95_low": 12362.46,
      "total_tonnes_ci95_high": 12530.87,
      "tonnes_per_hour_mean": 1555.833,
      "tonnes_per_hour_ci95_low": 1545.308,
      "tonnes_per_hour_ci95_high": 1566.359,
      "average_cycle_time_min": 29.914,
      "truck_utilisation_mean": 0.0,
      "crusher_utilisation": 0.9066,
      "average_loader_queue_time_min": 2.58,
      "average_crusher_queue_time_min": 3.84,
      "top_bottlenecks": [
        "Crusher highly utilised (90.7%)",
        "Long crusher queue (avg 3.8 min wait)",
        "Long loader queue (avg 2.6 min wait)"
      ]
    }
  },
  "key_assumptions": [
    "Trucks follow shortest travel-time routes recalculated at each dispatch decision",
    "Loading and dumping service times are truncated-normal (truncated at zero)",
    "Travel time noise is lognormal with CV=0.10 (mean preserved at 1.0x)",
    "Capacity-constrained road segments (capacity=1) are SimPy Resources; only one truck traverses at a time",
    "Loaders and crusher have capacity 1 (single-server queues, FIFO)",
    "All trucks are identical (100 t payload, loaded speed factor 0.85)",
    "Shift warmup is zero; trucks depart from PARK at time 0",
    "Trucks that complete a dump after shift_end are not counted (strict cutoff)",
    "Dispatching: nearest-available-loader with queue-length penalty",
    "All 12 trucks available; fleet scenarios select the first N from trucks.csv"
  ],
  "model_limitations": [
    "No fuel or shift-change delays modelled",
    "No truck breakdowns or maintenance schedules",
    "Dispatch does not account for congestion on capacity-1 roads",
    "Travel noise is independent between edges (no correlated delays)",
    "Loader availability is 100% throughout the shift",
    "Waste haulage not modelled (all ore goes to crusher)",
    "Parking delays at shift start not modelled"
  ],
  "additional_scenarios_proposed": [
    {
      "id": "loader_upgrade",
      "description": "Reduce LOAD_N service time mean from 6.5 to 4.5 min (match LOAD_S) to test whether loader speed at North Pit limits throughput."
    }
  ]
}