Understanding Conveyor Inspections in Mining at Los Pelambres

In the world of mining, conveyor systems play a critical role in transporting ore. However, these systems are often overlooked until they malfunction, leading to significant production losses. Emerson estimates that downtime on a crucial conveyor without a backup system can cost miners between $250,000 and $500,000 per hour. This potential for financial loss emphasizes the importance of early detection of issues through preventive inspections.

Stefan Blunck, a Principal Consultant in Mining & Materials Handling at RWE, shared his insights during the 17th Opex Workshop held in Belo Horizonte in June 2026. Using Los Pelambres, a copper mine in Chile, as a case study, he discussed independent evaluations of ore transport systems. For investors in the mining and energy sectors, understanding these evaluations is essential for assessing the reliability of mining operations.

Insights from Los Pelambres Inspections

During inspections at Los Pelambres, several key issues were discovered:

• Dust Buildup: Accumulated dust within conveyor tunnels poses both a housekeeping hazard and a safety risk, gradually forming around operational equipment.
• Pulley Vibration: Excessive vibration is an early indication that bearings or mounts might fail, signaling the need for maintenance before significant issues arise.
• Misalignment Issues: Misalignments can lead to ore spillage, resulting in lost material, increased cleaning efforts, and accelerated wear on the conveyor belt.

Despite sounding minor, these faults affect substantial assets. Conveyor Dynamics has documented the Los Pelambres conveyor project, which spans 12.7 kilometers with three separate lines (CV005, CV006, and CV007), each capable of handling 12,000 tons per hour. Minor imperfections in these systems can significantly hinder material transport.

Benefits of Preventive Inspections

Blunck advocated for the necessity of preventive inspections, arguing that they reduce maintenance expenses in the short term while extending equipment lifespan and ensuring operational efficiency. His findings revealed that approximately 60% of the recommendations from the inspections were put into practice by the follow-up evaluation. These proactive measures not only improved productivity but also lowered operational risks, though this figure lacks independent verification.

Antofagasta’s reported outcomes provided further context, noting that decreased output could also be attributed to heightened maintenance activities and reduced throughput. However, it is premature to conclude whether these adjustments were beneficial or detrimental.

Understanding the Cost of Unplanned Downtime

The financial implications of unplanned conveyor stoppages are significant. Various factors contribute to these costly events, which can differ vastly in their estimates:

• Belt mistracking and misalignment, leading to spillage and damage.
• Idler and pulley failures arising from excessive heat or lubrication issues.
• Carryback, where material adheres to the belt after discharge.
• Belt rips, which can extend up to 80 meters, as reported by Fenner.

According to Oxmaint, a staggering 68% of mining conveyor downtimes are due to mistracking, seized idlers, and motor overheating. This statistic highlights the importance of implementing robust maintenance strategies to address failure modes systematically.

Differentiating Audit, Internal Checks, and Sensor Usage

Choosing the best method for monitoring conveyor reliability requires understanding the unique strengths of various approaches. An independent audit is conducted by a team of specialists who assess the mechanical and operational performance of the equipment. This process includes evaluating alignment, structural integrity, and general maintenance practices.

On the other hand, sensors offer continuous monitoring, tracking factors such as vibration and belt position. These devices provide real-time data and can detect trends, enhancing preventive maintenance efforts. For instance, LIDAR-based sensors leverage laser technology to identify any abnormalities in belt rotation.

Establishing Trust in Reliability Claims

With claims of enhanced availability and reduced downtime, it's essential for investors to critically evaluate the underlying evidence. The potential for failure avoidance presents a challenge in measuring return on investment, as these outcomes are not always quantifiable.

Investors should ask key questions:

• What were the stoppage hours before the implementation of the reliability program?
• How have metrics like mean time between failures (MTBF) evolved?
• What trends are observed in belt damage and ore spillage?
• Have there been changes in maintenance costs per ton?
• What percentage of audit recommendations have been enacted?

The findings from Los Pelambres clearly illustrate that while identifying issues is crucial, the value lies in the implementation of solutions. In the realm of conveyor reliability, an effective approach must combine independent evaluations, local audits, and advanced sensing technologies to ensure optimal operations. Proper baseline measurements and reported implementation rates can transform statements from mere claims into credible, actionable insights for investors.