Open-Pit Mining's Quiet Revolution: Why Payload Capacity Is Now the Primary Growth Lever Across the world's largest open-pit copper mines, a quiet but consequential shift is underway. As orebody depths increase, haul distances lengthen, and greenfield development timelines stretch across decades, major producers are discovering that the most reliable path to near-term output growth runs not through new mines, but through the machines already moving ore. Payload capacity, once a secondary engineering consideration, has become the central variable in how copper producers plan, budget, and compete in a tightening supply environment. Few recent developments illustrate this logic more clearly than Codelco Andina purchases 18 Cat 798AC trucks at its Andean open-pit operation, bringing the active fleet at Platform 3700 to 57 units total. The move is worth examining not just as a procurement decision, but as a window into the operational philosophy reshaping copper mining across Latin America and beyond. When big ASX news breaks, our subscribers know first The Compounding Problem of Aging Equipment at High-Altitude Mines Fleet lifecycle management in large-scale open-pit mining is rarely straightforward. Equipment deteriorates in ways that are difficult to isolate from one another: aging haul trucks create longer maintenance windows, which reduce fleet availability, which forces remaining units to operate harder, which accelerates degradation further. The cycle compounds. At high-altitude operations like Codelco Andina, these pressures intensify. The Andina division sits within the Chilean Andes at significant elevation, where lower atmospheric oxygen density affects engine combustion efficiency, extended descent gradients place sustained thermal stress on braking systems, and the logistics of servicing remote equipment are inherently more constrained than at lower-altitude operations. When aging equipment intersects with these conditions, the throughput penalties accumulate across every shift. For mine planners, the calculus eventually becomes straightforward. Replacing or supplementing an aging fleet with higher-payload modern