Bio-refractory polymers are widely used as flocculants in tailing dewatering process and it is desirable that they are replaced by environmentally benign substances. A preliminary study of the settling behavior of tungsten ore using serpentine as flocculant has been conducted. The results show that serpentine is a useful flocculant for the settling of tungsten ore and its flocculation effect is influenced largely by the suspension pH and the flocculant particle (serpentine) size. Settling velocity was found to increase as the particle size of the serpentine decreased, from 0.15 mm to 0.037 mm, which is a consequence of higher loading of the positively charged flocculant onto the negatively charged ore particles due to larger specific surface areas.