Grind Less Power Into Every Tonne
EM3 engineers furnace, comminution and electrification programmes for operations where energy is commonly the second biggest cost on site.
Where The Energy Actually Goes
Independent industry figures show where cost and carbon concentrate in mining and metals processing.
Sources: Weir Group/CEEC, IEA, BBA, Climate Group SteelZero
The Pressures We Hear On Site
Six problems plant managers, energy managers and sustainability directors raise with us across metals and mining.
Grinding circuits consume most of the power
On a concentrator, the mill drives dwarf every other electrical load, and kWh per tonne milled drifts upward every time ore hardness changes. Comminution commonly accounts for around 25% of an average mine site's final energy, and more on copper and gold concentrators. Most sites cannot see which part of the circuit is responsible.
Furnaces and ladles lose heat at every step
Off-gas leaves at several hundred degrees Celsius, doors stand open, ladles wait without lids, and refractory degrades quietly between campaigns. Each loss looks small on its own. Together they typically put double-digit percentages of fuel through the roof of the building.
Ventilation runs flat out regardless of activity
Main fans were commissioned at full duty and have stayed there ever since, whether a level is active or empty. Underground, ventilation can account for up to half of site energy. Fan power scales roughly with the cube of airflow, so over-ventilating is one of the most expensive habits in mining.
Diesel fleets waiting on electrification decisions
On open pit operations, haul truck fuel often exceeds site electricity in energy terms, yet the electrification business case keeps stalling on infrastructure, duty cycles and capital timing. Meanwhile the fleet keeps burning, and every deferral year is priced in fuel and carbon.
Remote sites pay premium energy prices
Long grid connections, constrained networks and on-site diesel generation mean every wasted kilowatt hour costs more than it would anywhere else. Efficiency is the cheapest megawatt a remote operation will ever buy, but it rarely gets engineered with the same rigour as production.
Customers now demand Scope 3 evidence
Steel and metals buyers are organising: more than 40 major businesses have committed through initiatives such as SteelZero to procure net zero steel. Offtakers ask for decarbonisation plans and verified data, not intentions, and those requests land on the energy manager's desk.
What We Engineer In Your Plant
We work at the level of the equipment, not the slide deck. These are the energy sub-systems EM3 engineers on metals and mining sites.
Furnaces, smelters and ladles
We audit and optimise reheat furnaces, electric arc furnaces and ladle practice: regenerative or recuperative burners, furnace pressure control, door discipline, hot charging and refractory upgrades.
Waste heat recovery
We map furnace and smelter off-gas streams running at several hundred degrees Celsius and engineer recovery to waste heat boilers, recuperators or process preheat.
Grinding and comminution circuits
We survey the crushing, SAG and ball milling circuit against a kWh per tonne milled baseline, optimise control, classification and scheduling first, then assess capital options such as HPGR, fine screens and pre-concentration.
Ventilation on demand
We engineer VOD schemes with variable speed drives, airflow sensing and zone control that match underground airflow to where people and diesel equipment actually are.
Dewatering and pumping
We right-size pumps and impellers, apply variable speed drives, and shift pumping into off-peak tariff periods where storage allows.
Compressed air systems
We run leak surveys, reduce pressure set-points and zone the network, the classic cross-cutting measures across mills, mines and smelters.
Electrification of heat and mobile loads
We build feasibility cases for electrifying furnace heat and haul fleets, from trolley assist to staged replacement, grounded in real duty cycle data rather than vendor brochures.
On-site generation and storage
We integrate on-site generation and storage with the site load profile so remote operations reduce both cost exposure and carbon at the same time.
Three Pillars, One Partner
Every engagement maps to one of three service pillars, each angled to the realities of processing operations.
Energy Audits & Compliance
Site-wide energy audits and ISO 50001 implementation built for processing operations, from concentrator to smelter. You get a costed register of measures and the compliance evidence your regulators and offtakers ask for.
Design & Projects
Waste heat recovery schemes, ventilation control and electrification feasibility taken from study to commissioned plant. Our engineers deliver around production campaigns and planned outages, not in spite of them.
Energy Management & Intelligence
Sub-metering by circuit and energy per tonne monitoring that survives ore changes and product mix. Savings are tracked against regression baselines and verified to IPMVP, so the numbers stand up to any audit.
How The Work Gets Done
Every engagement follows the same engineering discipline, whatever the sector.
Audit
Instrumented, engineering-led, and baselined against your production data.
Roadmap
A costed, sequenced register of measures your board can fund in steps.
Delivery
Designed and delivered around production, never in spite of it.
Verify
Savings measured against the baseline and verified to IPMVP.
Results From The Circuit
Anonymised clients, real engineering measures, and savings measured and verified to IPMVP.
9%reduction in comminution kWh per tonne milledMinerals processingHow a minerals processing site cut comminution energy by 9% without touching throughput
A concentrator with multi-megawatt mill drives and a single site meter needed its grinding energy under control without risking throughput. EM3 sub-metered…
14%reheat furnace fuel reduction per tonne rolledSteel processingHow a European steel processor cut reheat furnace fuel by 14% per tonne rolled
Rising gas costs, ETS exposure and buyer pressure pushed a long products steel processor to act on its reheat furnace. EM3 delivered…
Regulation As A Roadmap
Regulation in this sector reads as cost until it is engineered into a plan. We use each driver to fund and sequence the measures the site needed anyway.
ISO 50001
The standard asks for a working energy management system with baselines, EnPIs and continual improvement. EM3 structures its energy management services according to ISO 50001 and builds the metering, reviews and documentation that keep a processing site audit ready.
EU ETS
EU smelters and processors carry a carbon price on every tonne of fuel burned, which compounds every furnace inefficiency. We turn ETS exposure into a prioritised abatement register with verified savings behind each line.
CSRD
Corporate sustainability reporting now requires audited energy and emissions data from operations, not estimates. We build the site-level data foundation, sub-metered and traceable, that group reporting teams can stand over.
Offtaker Scope 3 requirements
Initiatives such as SteelZero and the First Movers Coalition mean buyers ask suppliers for decarbonisation roadmaps and measured progress. We give your commercial team an engineering-backed answer instead of a holding statement.
National audit schemes
ESOS in the UK, SI 426 in Ireland and equivalent schemes in other geographies mandate periodic energy audits. We run the audit once, properly, so the same work that satisfies the regulator also feeds the investment plan.
Engineers Who Know The Circuit
Your first conversation is with our commercial team. Delivery is by engineers who have spent their careers in concentrators, smelters and underground operations.
Daniele Dominguez
Commercial Director
Senior Energy Engineer, Comminution and Concentrator Systems
Owns grinding circuit surveys, kWh per tonne milled baselines and control optimisation programmes.
Lead Engineer, Furnaces and Waste Heat Recovery
Owns furnace thermal audits, burner retrofit specification and off-gas heat recovery design.
Energy Management Consultant, Mining and Metals
Owns sub-metering design, regression-based EnPIs and IPMVP measurement and verification.
Go Deeper On Mining Energy
Practical engineering reading from our metals and mining work.
FrameworkThe industrial decarbonisation roadmap framework
A step-by-step framework for turning a decarbonisation ambition into a credible, costed, sequenced plan. Covers the energy baseline, the marginal…
ArticleVentilation on demand: the quiet win in mining energy
ArticleA step-by-step guide to reducing your carbon footprint: the EM3 customer journey
Common questions from metals & mining teams
Where does the energy go in a processing plant?
On mine sites, comminution commonly accounts for around 25% of final energy, and more on copper and gold concentrators. Underground, ventilation can reach up to 50% of site energy. In metals processing, furnace and smelting heat dominates. Dewatering, pumping and compressed air take most of the rest. The honest answer for your plant comes from sub-metering by circuit, which is where every EM3 audit starts.
Can ventilation be reduced safely?
Yes, when it is engineered rather than improvised. Ventilation on demand keeps statutory minimum airflows and re-entry rules intact while matching delivery to where people and diesel equipment actually are, using airflow sensing, variable speed drives and zone control. Demonstration projects have shown 20 to 50% fan energy savings. The system is built inside the mine's ventilation plan, with hard interlocks, so safety margins are preserved, never traded.
What does electrification mean for a remote site?
It means a staged plan, not a leap. We start with duty cycle and load data, then assess which loads electrify first: heat through waste heat recovery and electric technologies, mobile fleet through trolley assist or phased replacement. Network capacity, on-site generation and storage are evaluated together, because the grid connection is usually the binding constraint at a remote site. The output is a costed sequence your board can fund in steps.
