The mining industry is increasingly exploring comminution technologies for future mineral processing plants that can accommodate variable feed throughputs and fluctuating power sources, including renewable energy. These approaches aim to reduce operating costs and improve grade recoveries. In this context, dry comminution technologies such as the high pressure grinding rolls (HPGR) and vertical roller mills (VRM), offer significant opportunities for iron ore mineral processing flow sheets by reducing energy, water and grinding media consumption. The innovative GRolls® crushing technology, currently being developed in South Australia, extends energy-efficient crushing mechanisms into dry comminution grinding applications. It could be integrated with downstream processes such as dry magnetic separation and coarse particle flotation to enhance the sustainability and efficiency of iron ore processing and beneficiation. GRolls® is characterised by its ability to generate steep, narrow, and consistent fine particle size distributions, even with variable feed sizes and throughput. Its short residence time within the crushing chamber minimise over-grinding, enabling dry operation without the need for grinding media. This paper presents the results of an extensive laboratory testing program investigating the size reduction and energy performance of the laboratory scale Alpha GRolls400 unit for two magnetite ores, ranging from hard to soft, and one moderately hard hematite ore. The study provides critical performance data on the GRolls® crushing technology, supporting the identification of opportunities for future small to medium scale mobile and modular iron ore processing plants incorporating GRolls® units. Such flow sheets could offer the mining industry enhanced flexibility and energy efficiency for processing remote and complex magnetite and hematite orebodies, particularly in regions with limited energy and water resources.