Every source cited on this claim, counted once at its highest evidence strength and grouped by the side it supports. Generated from this page's own evidence rows — the same records the verdict is computed from — so the chart and the score cannot disagree. Strength labels follow the scoring methodology.

Source: Fifty years of copper mining: the US labor productivity

Long-run U.S. copper-mining labor productivity time series showing substantial fluctuations over roughly five decades, with productivity changes associated with technological, geological, and operatio

The most directly relevant figure in the supplied evidence: it shows that mining efficiency varies substantially over time and is shaped by mine conditions and technology, weakening the assumption that consolidation reliably improves production efficiency.

View figure at source: International Energy Agency, Global Critical Minerals Outlook 2024

Bar chart comparing the production shares of the top three countries in mining and refining of major critical minerals, including copper, lithium, cobalt, graphite, and rare earth elements

A widely cited visual measure of concentration in mineral supply chains. It helps readers distinguish highly concentrated markets from more competitive ones, while providing context for why consolidation and supply-chain dependence matter.

View figure at source: Dragline Retrofit for AC Motion Power

Before-and-after engineering performance figure for a mining dragline retrofit, showing changes in AC-motion power-system performance after equipment modernization

This figure provides a concrete counterpoint to merger-based efficiency claims: measurable operational gains can result from targeted equipment and technology investment, independently of ownership consolidation.

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