Rodney Aggregates Supplies use a load volume scanner (LVS) in their Whangaripo Quarry north-east of Warkworth, New Zealand, to minimise profit loss due to carry-back on their overburden stripping programmes.
Daniel Le Roux, Business Manager at Rodney Aggregates, says, “The scanner was measuring significant amounts of carry-back by the contractor. Especially this season where the material was sticky and wet compared to previous years. This was often up to 5mᶾ per load, which on some trucks is 20-25% carry back — obviously a huge saving for us.”
The Whangaripo Quarry is a regular supplier of high-quality greywacke products (asphalt and concrete aggregates through to base courses and bulk fill) to the North Auckland region.
They strip up to 2,500mᶾ of overburden material a day and if Rodney weren’t using the Loadscan LVS they wouldn’t be aware of the carry back in the truck bins, which influenced the final payments to the contractor. In the years that they used the surveyed volumes compared with truck load count, carry back was never considered although it was present, therefore a discrepancy was between survey and truck count volumes. In terms of financial cost, if 20% of a truck load is haul back then the business suffers $3,250 per day cost for material not hauled. Over their six-day working week that’s $19,500.