Rugged By Design: How Modern Mining Materials Are Withstanding Extreme Conditions

Material Selection in Mining: Withstanding Harsh Operating Conditions

Mining has long been a test of materials, with every stage of the mining value chain placing equipment under extreme stress. From crushing and conveying to slurry transport, leaching, oxidation, and refining, components must withstand impact, abrasion, pressure, heat, corrosion, and in some cases, oxygen-rich environments where safety risks become even more complex.

In the past, material selection was relatively straightforward: choose something strong enough to survive mechanical load. However, as mines became larger and processing plants more intensive, simple strength was no longer enough. The rise of high-throughput crushing, grinding, and slurry handling introduced new problems: wear, abrasion, and erosion. Equipment was no longer failing only because it broke under load; it was wearing away from continual contact with abrasive ores, high-velocity slurries, and repeated impact.

This drove the adoption of harder and more wear-resistant materials, including alloy steels, manganese steels, and high-chrome irons. Rubber linings and polymer-based materials also became important, particularly in slurry pumps, mill linings, and pipework, where flexibility and abrasion resistance could reduce maintenance requirements.

The development of new materials and technologies marked an important turning point in material selection. It was no longer just about strength; it was about matching the material to the failure mechanism – a theme that now shapes most severe-service mining design decisions.

Hydrometallurgical processing, which has become increasingly important as mines pursue more complex ore bodies, introduces some of the harshest operating conditions in mining. Technologies such as high-pressure acid leaching (HPAL) and pressure oxidation (POX) allow operators to recover critical minerals from ores that would otherwise be difficult or uneconomic to process.

However, these processes combine high temperatures, high pressures, acidic media, abrasive slurries, and aggressive chemical environments. In POX applications, oxygen-enriched conditions add another layer of complexity, because material behavior in oxygen service must be carefully controlled to manage ignition and combustion risks.

Conventional steels may not provide sufficient corrosion resistance, leading to delamination or flaking of standard coatings, and even high-performance alloys can face limitations. The result is a constant balancing act between corrosion resistance, wear resistance, safety, maintainability, and cost. Unplanned downtime is often the most expensive outcome.

To extend equipment life without manufacturing entire components from expensive exotic alloys, mining operations have long used coatings, overlays, and surface treatments. These approaches are logical: wear and corrosion occur at the surface, so protecting the surface can deliver significant improvements in component life.

Traditional thermal spray coatings have been widely used in severe-service valve trim and other processing components. They provide a hard protective layer but also have limitations. Many are mechanically bonded rather than metallurgically integrated with the base material. They can also contain microscopic porosity. In aggressive acid slurry service, that porosity can allow corrosive media to reach the substrate underneath, leading to under-coating corrosion, cracking, and delamination.

This is where the next phase of materials technology is emerging: not simply coating a component but engineering its surface at a deeper level, to withstand combined erosion and corrosion in HPAL and POX duty. Score’s FM-1500 technology represents an example of this new generation of engineered surface solutions.

FM-1500 modifies the surface of titanium valve trim using a metallurgically bonded titanium nitride-based layer. The protected surface becomes integrated with the component, rather than being a separate layer that can peel or delaminate. FM-1500’s key advantages include a dense, non-porous structure, high hardness, and a substantially thicker modified layer compared to typical thermal spray coatings.

In one HPAL autoclave discharge application described by Score, a valve’s internal components that had previously required replacement after around six months achieved more than two and a half years of service following retrofit with FM-1500. For operators, this type of improvement can translate into fewer shutdowns, reduced maintenance exposure, and lower total cost of ownership.

Score’s BM-1600 technology addresses the POX oxygen-service problem by using a dual-layer system: a dense, fusion-bonded corrosion-resistant layer combined with a low-friction ceramic topcoat. The objective is to protect the substrate, maintain sealing performance, and reduce the failure modes associated with conventional coatings.

BM-1600 has also been validated for oxygen-service conditions using globally recognized testing methods. This matters because in POX applications, material performance is not only an uptime issue but also a safety issue. In some of the most severe field applications described by Score, BM-1600 has extended service life in POX valve applications from around four weeks to over twelve months.

The future of material selection in mining reflects a broader industry trend. Operators are moving away from simply asking, “What is the strongest material?” and toward asking, “What failure mechanism are we trying to address?”

This change is especially important as mines process lower-grade and more complex ores, operate under tighter environmental constraints, and seek to reduce unplanned downtime. Future material strategies will increasingly combine base alloys, advanced coatings, surface modification, digital inspection, and condition-based maintenance.

The most successful solutions will not necessarily be the most expensive materials but those that deliver the best performance over the full life cycle of the asset. In severe-service mining applications, technologies such as FM-1500 and BM-1600 show how far material engineering has advanced.

These technologies represent a shift from generic protection toward purpose-designed surface technologies that address the specific realities of severe-service mineral processing such as HPAL and POX operations.

In modern mining, materials are no longer passive components but performance enablers. And in the most demanding processing environments, choosing the right material technology can be the difference between recurring failure and reliable operation.

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