As mining companies face elevated costs, constrained capital, and lengthy permitting timelines for new projects, many are intensifying operations at existing sites. This strategic shift has elevated the importance of plant reliability and reagent efficiency as drivers of growth.

Zach Richardson, Sales Manager at Carmeuse Systems, told The Northern Miner Video Anchor Devan Murugan that miners should regard lime handling as core plant infrastructure rather than peripheral equipment. Lime is one of the most widely consumed reagents in mineral processing, used for pH control in flotation circuits and in leaching operations such as gold cyanidation, where maintaining alkaline conditions is essential to recovery. Despite this significant impact on downstream chemistry, metal recovery rates, plant uptime, and overall operating costs, lime handling and slaking systems frequently receive minimal attention.

Investment Shift Toward Existing Operations

Richardson confirmed that the industry is experiencing a clear shift in capital allocation. A decade ago, mining companies directed substantially more investment toward new operations. In recent years, however, the focus has moved toward existing sites, where companies aim to extract greater production and efficiency from assets already in place.

New mines demand substantial upfront investment and hinge on factors largely outside a company's control. Permitting processes have grown increasingly complex, with timelines extending considerably. By contrast, investing in an operating site can deliver a faster return without the capital expenditure required to construct a new mine.

When companies invest in existing operations, Richardson noted, they typically prioritize core processes first. The systems feeding those processes — including lime equipment — are frequently overlooked. Although treated as secondary, these systems remain critical to plant operations.

The Hidden Costs of Neglect

Richardson explained that lime handling and slaking systems are often neglected because few personnel want to work with them. While they may sit outside a plant's main process flow, they directly affect downstream chemistry and the speed and efficiency of metal recovery. A failure in one of these systems can cascade into much larger operational problems.

Carmeuse Systems is frequently contacted only after a site encounters an emergency. These situations create safety hazards, as maintenance crews must perform unplanned work in confined spaces exposed to heat and dust. Operators may attempt to switch systems to manual mode, but much of the institutional knowledge required to operate older equipment that way has been lost. Attempts to keep the plant running can inadvertently worsen the problem. If the lime system becomes inoperable, the mine may be forced to shut down other sections of the processing plant.

Resistance to change compounds the issue. Operators may continue using the same approach simply because the equipment still functions, even if poorly. Since the pandemic, lime has become a considerably more expensive process input. When equipment fails to use it efficiently, the operation wastes both reagent and money.

Carmeuse Systems is working to shift customers from a reactive posture to a proactive one — helping them understand how the equipment functions, how to operate it efficiently, and when to intervene before a problem escalates into an emergency. Richardson described this approach as "lime utilization," with the objective of maximizing the proportion of lime that performs useful work rather than being wasted.

Workforce Knowledge Gap

The loss of experienced workers represents one of the mining industry's most significant challenges, Richardson said. Veteran employees are retiring while younger staff tend to move between companies more frequently. Sites are losing operational knowledge faster than they can replace it. This trend has pushed many operations to deepen partnerships with equipment and reagent suppliers that can transfer specialized knowledge to on-site teams.

Richardson recounted a recent conversation with a young operator who wanted to run equipment properly but lacked the necessary training. "I want to do a good job, but I just don't know how to operate this piece of equipment," the operator told him. "I have no idea what we're doing. Please help." Richardson said he hears variations of this statement at site after site.

To close this knowledge gap, Richardson emphasized that mining companies must collaborate more closely with suppliers who understand both the equipment and the material flowing through it. A regional engineering manager told him his company had already reached that realization: "We have to rely on our suppliers to know how to run these machines and these systems as efficiently as we can. We just don't have the knowledge in-house to do it."

Because Carmeuse Systems is part of a lime producer, the company brings an understanding of both the raw material and the handling and slaking equipment. This dual expertise matters, Richardson explained, because lime quality, water quality, and operating conditions all influence system performance.

The industry must preserve institutional knowledge and make it accessible to the personnel running the plants, Richardson concluded. Better equipment alone will not resolve the problem — operators must also know how to use it effectively.

This sponsored Q&A is promoted content paid for by Carmeuse Systems and produced in cooperation with The Northern Miner. For more information, visit .