Vibratory gold wash plants work well in clean sand and gravel materials. They are not recommended for clay or sticky materials. The sizing of sluices, when using a vibratory wash plant, is extremely important to maintain proper gold recovery.
Scandinavia is known for its hard rock the south of Sweden, or the Boda quarry near the small town of Vrigstad to be precise, a particularly hard granite can be found. TJ Gräv AB from Brandstorp has the task of processing 40 000 t of this material.