Mine to Mill Optimisation is Gaining Economic Weight

In sider

21/08/2026

Mine to Mill Optimisation is Gaining Economic Weight

Mining companies have long looked at drilling, blasting, crushing and grinding as connected parts of the same production process. The difference now is that the industry has better tools to measure those connections and, more importantly, put a financial value on them.

That is making mine to mill optimisation more important as a business decision. A blast that produces the right rock size can reduce pressure on the crusher and mill. A change in mill settings can affect throughput and energy use. A decision that appears more expensive at one stage can therefore lower the total cost of producing a tonne of metal across the operation.

Recent research illustrates how large this opportunity can be. A 2026 study built an integrated mine-to-mill model using more than three million simulated scenarios, linking drilling and blasting parameters with screening, crushing, stockpiling and grinding. Its machine-learning models achieved predictive accuracy above 90%, allowing technical and financial trade-offs to be assessed across the production chain rather than at individual stages.

This changes the question mining companies are asking. Instead of looking for the cheapest way to drill, blast or process material independently, the focus can shift toward finding the combination that creates the best overall result.

The Blast Can Set the Cost of the Mill

Fragmentation is one of the clearest examples of why mine to mill optimisation matters. Rock that is broken into a more suitable size during blasting can require less work during crushing and grinding. Coarser or more uneven fragmentation can have the opposite effect, increasing downstream energy use, bottlenecks and handling requirements.

Comminution is particularly important because crushing and grinding account for more than half of mining energy consumption in recent research, with grinding being especially energy intensive. One study estimates that comminution accounts for around 53% of total mining energy use and more than 60% of total operating expenses in the context it examined.

That creates an important economic trade-off. Spending more on drilling and blasting can make sense when better fragmentation reduces a larger cost further downstream. But the objective is not simply to use more explosives or create finer rock. The right level depends on geology, blast design, processing conditions, recovery and the cost of each stage.

A long-running case at Ernest Henry in Australia shows how upstream changes can affect downstream operations. A fragmentation optimisation programme increased the share of material that could be dumped directly into the crusher from 70% to 92%, while also reducing reliance on the rock breaker.

Key takeaway: Changes made upstream can influence the energy, throughput and operating costs of the downstream processing chain.

Mine and Mill Decisions are Becoming More Connected

The value of mine to mill optimisation becomes clearer when the entire production chain is considered together. A mining operation can improve its performance at the face while creating problems at the plant, or increase mill throughput while raising energy use, wear and maintenance costs. Looking at each stage separately can therefore hide the economics of the full operation.

Ore variability makes this harder. Rock hardness, mineralogy, grade and fragmentation can change as mining moves through a deposit, affecting how the processing plant behaves. Recent research on mine-to-mill planning increasingly combines geological and metallurgical information to anticipate these changes and adjust extraction, blending and processing decisions accordingly. This approach, often linked to geometallurgy, can help operations manage variability rather than simply react to it.

The same principle applies to production targets. A mill running below capacity may spread fixed costs across fewer tonnes, while pushing throughput too high can increase energy consumption, equipment wear and maintenance requirements. A 2026 integrated optimisation study found a U-shaped relationship between total mine-to-mill cost and SAG throughput, showing that the cheapest operating point is not necessarily the highest possible throughput.

This makes mine to mill optimisation less about maximising one metric and more about finding the point where the entire system creates the most value.

Key takeaway: The strongest mine-to-mill gains come from optimising the production chain as a connected system rather than improving individual stages in isolation.

Digital Models are Making Whole-Chain Optimisation More Practical

The ability to analyse millions of possible combinations is changing how mine-to-mill decisions can be made. Instead of relying entirely on periodic engineering reviews, mining companies can increasingly use models to test how changes in blasting, material movement, stockpiling and plant settings could affect cost and throughput before changing the operation.

Digital twins and advanced analytics are also being used to account for ore-feed variability and optimise throughput, recovery, energy and water use. At the New Afton operation, optimisation work increased daily mill throughput to 20% above design capacity, with average operating throughput later rising by 25% during the optimisation period while maintaining improvements in grind size and concentrate grade.

The financial value of this approach comes from connecting decisions that were traditionally managed separately. Better fragmentation can reduce grinding requirements. More consistent feed can improve plant stability. Better blending can help maintain recovery. And a clearer understanding of the full chain can help operators avoid pushing one part of the operation beyond its economic optimum.

The shift is therefore not simply towards more automation. It is towards better coordination between mining and processing decisions. For mining companies, that can change how performance itself is measured. Instead of asking whether the mine moved enough tonnes or whether the mill reached its maximum throughput, the more useful question becomes whether both parts of the operation worked together to produce the strongest financial result.

That is where mine to mill optimisation is gaining its economic weight, the value is increasingly found not in making one stage cheaper, but in making the entire production chain work better.

Conclusion

Mine to mill optimisation is becoming a stronger economic lever as mining companies look beyond individual production targets and focus on the performance of the entire value chain. A change in blasting can affect crushing and grinding, while ore variability can influence throughput, recovery, energy use and maintenance further downstream.

The goal is not simply to maximise tonnes moved or mill throughput. It is to find the combination of mining and processing decisions that creates the best overall result at an acceptable cost.

As digital models, geometallurgy and advanced analytics become more practical, operators can test more scenarios and respond to changes in ore and operating conditions more quickly. The competitive advantage will increasingly come from optimising the mine and mill together, rather than treating them as separate parts of the operation.