Background
An iron ore mine in Hebei Province, China experienced an unplanned belt failure on its primary ore conveyor β 1,200mm wide EP400, 520 meters long β due to a severe longitudinal tear caused by a piece of tramp iron (a broken bucket tooth) that entered the crusher and passed through to the belt.
The tear was 180 meters long, running the full length of the belt's straight section. The belt was unrepairable β it needed full replacement. The mine's production manager faced a complete halt of ore processing until the belt was replaced.
The mine's on-site belt inventory was a single roll of EP315 in a different width β not directly substitutable. The mine's regular belt supplier had a lead time of 18 days for a replacement EP400 in 1,200mm width.
Response
Elephant Rubber's warehouse held stock of EP400 in 1,200mm width. The mine's procurement manager contacted us at 8pm on a Friday.
Timeline:
- Friday 8pm: Initial contact from mine procurement team
- Friday 9pm: Confirmed stock availability β 3 rolls of EP400 1,200mm M24 cover, 150m each (total 450m, slightly short of the 520m needed)
- Friday 11pm: Agreement on price and emergency delivery arrangement
- Saturday 6am: First two rolls loaded on truck from our Hebei warehouse
- Saturday 7am: Identified a third roll from a Tianjin distributor partner to make up the full length
- Saturday 2pm: All three rolls delivered to mine gate
- Saturday 3pmβSunday 8am: Mine maintenance team installed belt (17-hour installation including vulcanized splicing)
- Sunday 8am: Conveyor restarted; ore processing resumed
Total downtime from failure to restart: approximately 38 hours.
Without the available stock, the 18-day lead time from the regular supplier would have meant 18+ days of production loss.
Operational Impact
The mine produced approximately 8,000 tonnes of iron ore concentrate per day from this conveyor. At 18 days downtime, the production loss would have been approximately 144,000 tonnes of concentrate β a significant revenue and contract delivery impact.
The 38-hour emergency response, while not eliminating the downtime, contained it to a manageable level.
What Made the Emergency Response Possible
Stock availability. The critical factor was having the right belt in stock. Elephant Rubber maintains inventory of common belt specifications (EP250, EP315, EP400 in standard widths) for exactly this type of situation.
Warehouse proximity. Our Hebei warehouse location β close to multiple major mining regions in northern China β meant same-day truck delivery was feasible.
Distributor network. The third roll came from a Tianjin distributor partner. Having established relationships with nearby distributors allowed us to source the additional material within hours.
What the Mine Changed After This Event
Following the emergency, the mine revised its on-site belt inventory policy:
- Maintained one full replacement roll of EP400 1,200mm on-site as emergency stock
- Established a formal agreement with Elephant Rubber for priority supply of emergency orders
- Implemented tramp iron detection (a metal detector and magnet on the crusher feed) to prevent recurrence
The cost of maintaining one roll as buffer stock was small compared to the production loss risk of a repeat event without inventory.
Key Points
Belt inventory matters for production-critical conveyors. Maintaining one replacement roll on-site for your most critical conveyors is operational insurance. The cost is low relative to the downtime risk.
Emergency supply is possible but requires stock. We can supply quickly because we hold stock. If we manufactured to order only, emergency response would be impossible. Buyers who value emergency availability should confirm supplier stock levels.
Tramp iron is a leading cause of catastrophic belt failure. Metal detectors and suspended magnets on crusher feeds are standard protection. Their absence creates recurring risk.
Elephant Rubber supplied the emergency replacement belt for this incident.