Heap leaching is still too often managed through a mix of visual checks, manual adjustments, and field experience that can hide performance loss until recovery has already been affected. On a large pad, a pressure drop, a clogged line, or uneven spacing might not look dramatic at first. But over weeks and months, those variables can shift solution pathways, create uneven wetting, and reduce recovery on each subsequent lift across a wide area.
That matters because the challenge in heap leaching is not simply getting the solution onto the pile. It is keeping distribution consistent to support uniform percolation through ore that varies in size, placement, and permeability. If one section is overirrigated and another is dry, recovery suffers. If side slopes or roadways receive weak coverage, recoverable value may be left behind. If line placement is uneven, channeling can develop early and continue through the cycle.
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In my experience, the operations that manage this best are the ones that stop treating it as a basic irrigation task and start treating it as a controlled process. That means paying closer attention to pressure-compensated application, section-level flow control, minding specific filtration and flushing cycles, and real-time visibility into what is happening across the pad. The more disciplined those variables are, the less recovery depends on guesswork.
Heap leaching has long been one of the most effective methods for mineral extraction, but there are challenges in this process. A perennial problem is clogging, which occurs when precipitated salts or foreign matter in the solution used in irrigation or in a closed system cause blockages. These clogs hinder solution flow and require close attention to prevent and correct. Another challenge is when uneven percolation across the heap lowers extraction efficiency due to non-uniform solution distribution. Also, chemical reactions from sulfuric acid or cyanide, which are often used in the extraction process, over time damage system components and shorten the life of equipment. It is critical that rugged, chemical-resistant materials are used in tubing and other materials for durability.
In many operations, though, these issues are still handled through routine field checks. Crews walk the pad, look for visible problems, and make manual valve adjustments. That approach can work, but it leaves too much room for approximation in a process that often runs over large acreages for 75 to 120 days and increases labor costs. Visual confirmation that a line is “working” is not the same as knowing that pressure and flow are within tight parameters across the section.
This is where the issue shifts from irrigation hardware to operating model. Pressure monitoring, flow sensors, automated valves, telemetry, and skid-based section control change the way the pad is managed. Instead of waiting for a problem to become visible, operators can identify pressure increases that suggest plugging, pressure drops that signal a break, or uneven flow that affects water balance and recovery. The value is earlier response, tighter process control, and fewer surprises over the course of the leach cycle.
That shift fits a broader industry direction. Deloitte’s 2026 mining trends report highlights connected operations, smarter use of data, and AI-enabled performance as central to more resilient and productive mining systems. Heap leaching belongs in that same discussion because it is a large, continuous process with many variables and is well-suited to better instrumentation and more responsive control.
The workforce context makes this even more practical. SME projects that more than half of the current U.S. mining workforce will be retired and replaced by 2029. As experienced operators leave, mines will need more standardization, more remote visibility, and fewer routines that depend on repeated field intervention. Better heap leach control supports exactly that because it reduces dependence on manual inspection while giving teams a clearer picture of how the process is performing in real time.
There is also a strong process-discipline component to consider. Uneven application does not just lower recovery. It complicates water balance, creates oversaturated areas, and introduces operational instability that ripples throughout the cycle. Better control over section-by-section flow helps operators stabilize those variables instead of reacting to them after the fact. That matters for recovery, but it also matters for compliance, water management, and daily operating confidence.
The next step in heap leaching is not simply adding more solutions or more hardware. It is replacing approximation with precise measurement and more consistent control. Mines that can see their pads more clearly and respond more quickly will be in a better position to improve each new lift recovery, reduce variability, and manage labour more effectively. In that sense, precision leach control goes beyond a technical upgrade and becomes part of a smarter way to run the operation.
By Tom Claridge, Sales Manager, Mining North, Netafim North America
