5 Errors That Destroy Schedules in Mining Projects

Mining projects consistently overrun schedules. These 5 errors account for the majority of delays — and all are preventable.

1. 1. Ignoring geological uncertainty in the baseline

   Mining schedules must build in geological contingency. Treating subsurface assumptions as certainties creates a fragile baseline that breaks at first drill core.

2. 2. No float management

   Consuming critical path float early — then having none left for real emergencies — is the most common cause of final delivery delays.

3. 3. Equipment procurement not on the critical path

   Long-lead equipment (crushers, conveyors, transformers) with 18-24 month lead times is often not reflected in schedule logic, creating hidden criticality.

4. 4. Disconnected WBS and schedule

   When the WBS (cost structure) and schedule use different work packages, EVM becomes impossible and cost/schedule data diverges.

5. 5. Progress reported without earned value

   Reporting '65% complete' without a budgeted baseline means you cannot forecast the final cost. EV measurement turns progress into a management tool.