Lead distance: why the same aggregate costs more 40 km down the road

Two road heads order the same 20mm from the same plant in the same week. One is near the plant gate. The other is 40 km further down the highway, and its quote is noticeably higher for stone that came off the same belt. Purchase desks see this and assume the supplier is padding the far rate.

It is not padding. The stone costs the same at the stockpile. What you pay for on the longer run is lead: the distance a loaded tipper covers from source to point of use. A longer lead means fewer trips per tipper per shift, so more tippers, more diesel and more tyres stand behind each tonne delivered.

What lead means

Lead is haul distance, measured one way, from where material is loaded to where it is tipped. In a quarry it is face to hopper. On a road it is plant or stockpile to the chainage where the layer is going down. A contract may state one average lead for the whole package or pay haulage in steps by distance. Either way, it is the first number we ask for on any aggregate supply enquiry.

It matters because crushing cost barely moves with geography and haulage does. Haulage is often the largest single part of a delivered rate, and the one part that depends entirely on where you are standing.

How lead turns into cost

A tipper earns by the trip. Its cycle is load, travel loaded, queue and tip, travel back empty, queue to load again. Loading and tipping take much the same time whatever the distance. The two travel legs grow with every kilometre, and the return leg carries nothing.

So the trips a tipper makes in a shift fall as the lead rises, while the driver, the vehicle and its finance cost the same for that shift. Diesel and tyres are consumed by the kilometre, faster on a broken road. Spread those costs over fewer tonnes and the haulage element per tonne climbs. Working out tipper numbers from cycle time sets the arithmetic out step by step.

What happens as the lead grows

The real lead is not the map distance

A ruler on a map gives the shortest lead anyone will ever quote, and no loaded tipper drives it. The route that counts is the one the vehicle can legally and physically take: bridges that will carry it, roads it is permitted on, towns that restrict heavy vehicles at certain hours, a level crossing that shuts for long stretches. The legal payload on that route matters as much as its length, and tipper payloads and the overloading rules covers that side.

Road condition changes the answer again. A short stretch of cut-up approach road can cost more in time and tyres than a much longer run of good highway. Measure the lead by odometer on the loaded route, write that figure into the order, and both sides are pricing the same thing.

Lead moves along a linear project

A building has one delivery point. A highway has a delivery point that moves. Early in a package the work front may be beside the plant. By the end it may be at the far end of the alignment, with every tonne of GSB and WMM for that stretch travelling the full length.

A plant placed at one end of a long package has a lead that grows from nothing to the whole length. Placed near the middle, the worst lead is about half that, in both directions. The figure to price against is the tonnage-weighted average: where the heavy quantities actually go, not the distance to the camp office.

It gets harder when one source feeds two roads. Our Beed operation supplies NH-52 and NH-561A out of one material operation, which is only economic if the leads are managed properly.

Haul from a plant or bring a plant to the rock

Lead drives one decision above the others: either finished material is hauled from a plant that already exists, or a plant is moved to rock nearer the alignment and the haul is shortened for every tonne that follows.

Our working rule: inside about 60 km of one of our plants, a delivered rate is usually competitive. Beyond that, deploying a plant closer to the site normally beats hauling. Moving and erecting a plant is paid for once, and takes about a month from order to steady production on a site with reasonable access. Extra haulage is paid again on every tonne. On a package that needs several lakh tonnes, the saving per tonne usually overtakes the one-time cost.

• Quantity. A small requirement never repays a plant move, however long the lead.
• Rock. A nearer plant needs a workable source and a lease near the alignment, and not every district has one.
• Time. A plant needs about a month before it produces. Hauled material can start as soon as tippers are free.
• Road. A long lead on a good highway can beat a short one over a bad approach.

If the answer is a plant on site, that is crusher plant operations and a different quote. Owning a plant or contracting the crushing covers the decision after that one.

What to tell a supplier to get a usable rate

1. The delivery point as a chainage or a map pin, not the name of the nearest town.
2. The route you expect tippers to use, and any bridge, crossing or timing restriction you already know about.
3. The material, the grading and the quantity per month.
4. How the delivery point will move over the package, stretch by stretch.
5. Whether there is a weighbridge at your end.

With those five, a supplier can quote a rate that survives the first month. Without them you get a rate with a cushion in it for everything nobody mentioned.