Test Concept

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The Geopyörä breakage test characterizes ore hardness from small, discrete samples. Each test produces the Geopyörä Index (GPi), our own index of ore hardness calculated directly from the energy and force measured during breakage. With our developed deep neural network models, the test also delivers the industry-standard comminution parameters: Axb and DWi for impact breakage, BWi for grindability, and rock mechanical properties such as UCS and PLT. From a single test, these results feed directly into geometallurgy, mine-to-mill and feasibility workflows to forecast throughput, de-risk projects and protect NPV.

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The test uses two counter-rotating wheels to break rocks at a controlled reduction ratio. Particles are fed automatically, one after another, without stopping or resetting between breaks, which keeps it fast enough for high-volume testing of assay-scale samples. Force and energy are measured for each particle as it fractures: energy from the loss of rotational speed (momentum) of the wheels, and force from the load cells. Because the force needed to fracture a rock depends on its strength, varying the degree of reduction maps its full breakage response and gives a direct, accurate measurement of the energy absorbed.

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