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Manufacturers have improved various stirred mill types to be well adapted to fine and ultrafine grinding applications. These stirred mills, which are operated in wet or dry conditions, may be classified as horizontal - such as AHM-horizontal agitated media mill, IsaMill and Drais mill - or vertical - such as tower mill, Vertimill, Maxmill, Stirred Media Detritor and ATR vertical agitated media mill. The main difference between vertical and horizontal structures is in their operational variations. Additionally, the scaling-up of mills is also an important parameter for selecting the suitable orientation [1]. The purpose of this study was to investigate the dry grindability of calcite powders in a vertically and horizontally orientable laboratory batch-type stirred mill. The experimental results were evaluated using stress intensity analysis. The results showed that the d50 values decreased with increasing stress energy down to a certain point and then increased for both milling orientations. Even though the optimum stress energies for both vertical and horizontal orientations were in the range of 1 x 10-3 to 5 x 10-3 Nm at 750 and 1,500 kJ/kg energy consumption, the product size was finer for the horizontal orientation at the same stress energy value. [ABSTRACT FROM AUTHOR]