Cost Per Ton Crushing Breakdown

The profitability of a crushing and screening operation collapses into one number: what each saleable ton of aggregate actually costs you. That number is not sitting in a drawer as an invoice. A useful cost per ton crushing breakdown gathers items that accumulate in different records, on different time scales and in different units — energy as kilowatt-hours on a meter, wear parts as pieces leaving the store, depreciation as an annual entry in the asset ledger. Any comparison made before these are reduced to the same production period will mislead you.

Grouping a cost per ton crushing breakdown

The skeleton of the calculation is simple: total spend for a period divided by the tonnage that genuinely became saleable product in that same period. The difficult part is assembling the numerator honestly, and that starts with classifying each cost by behaviour. Fixed costs continue whether the plant runs or not. Variable costs rise and fall with throughput. Without that split, nobody in the meeting can explain why cost per ton jumped in a month when production dipped.

Measuring the five main items

Energy

In an electric stationary plant, read energy from sub-meters on the crusher, screen and conveyor groups rather than only from the incoming main meter. The main total tells you what the site consumed; it does not tell you which machine ran empty. On a diesel mobile plant the equivalent is matching engine hour counters against fuel delivery notes. The trap is identical in both cases: when a machine is fed well below its rated capacity, energy per ton rises, because the drive power spinning at no load stays constant while the tonnage in the denominator shrinks.

Wear parts

Jaw plates, mantles, concaves, blow bars and screen media only become comparable when their price is divided by the tonnage they processed during their life, not by calendar months. Recording two figures at every change-out is enough: the weighbridge counter reading when the part went on, and the reading when it came off. The difference is the part's true life in tons. Dividing cost by that tonnage produces a figure you can put next to a competing alloy or a competing supplier. Feed abrasiveness dominates this item — the same machine consumes wear metal noticeably faster in hard abrasive rock than in soft limestone.

Labour

Booking labour as gross wages alone understates the item. Insurance, transport, meals, personal protective equipment and training belong in the same line. Operating labour behaves as a fixed cost in practice, because payroll does not halve when the plant runs at half capacity. Maintenance labour is mixed, since it tracks breakdown frequency.

Depreciation and finance

Even when machinery is paid for outright, it enters the cost calculation period by period. Straight-line allocation over the expected useful life is the common approach. Where the asset was funded by a loan or a lease, the interest or rental burden belongs on its own line; it is indifferent to volume and it is the item that pushes cost per ton up hardest in a slow month.

Downtime loss

Downtime is the item most often ignored, precisely because no invoice arrives for it. Fixed costs keep accruing while the plant stands still, so the denominator shrinks and every other item per ton inflates. Logging stoppages in tons forgone rather than only in hours makes the effect visible: each entry records the tonnage that should have been produced in that interval. Placed beside actual output at period end, the gap reads directly as money.

Getting the denominator right

An error in the denominator wastes all the discipline applied to the numerator. Use saleable product tons, not feed tons. Circulating load returning from the screens must not be counted twice. Fractions that fall outside specification and sit in stock, or leave the site as fill, are not saleable product either. Weighbridge records are the most defensible source; where there is no weighbridge, a belt scale combined with stockpile survey is the practical substitute.

Turning the calculation into a decision

Once the items are assembled this way, the model stops being a report and starts being a decision tool. Energy per ton drifting upward over several months usually points to irregular feeding or a worn cavity profile. A rising wear cost per ton is expected if the feed material changed; if it did not, settings and feed arrangement deserve review. Downtime growing faster than every other item says the spare parts policy has fallen behind the production rate. Used alongside the other measurements gathered under plant efficiency, this structure lets you measure what an improvement is worth per ton instead of estimating it.

To populate the item list with your own figures, the operating cost tool asks for the same structure step by step; with the source records in front of you the exercise fits in one sitting.

Frequently asked questions

Should depreciation sit inside cost per ton?

It depends on what you are comparing. To judge the operating performance of two plants, keeping depreciation outside gives the cleaner answer. To set a selling price or to test whether the investment is paying for itself, it must be included.

Why track wear parts per ton instead of per month?

A monthly amount moves with throughput and makes two months incomparable. A per-ton figure is independent of volume, so it shows the effect of an alloy change or a settings correction directly.

Is it correct to treat downtime as a cost?

Statutory accounts contain no such line. Internal cost tracking still needs it, expressed as tons forgone; otherwise nobody notices that the fixed costs are being spread over fewer tons.

How many months of data give a meaningful figure?

Wear part lives usually exceed a month, so a single month distorts the result. Take a window that covers a full change-out cycle and includes the seasonal stoppages.