Abstract: A method of manufacturing covering plates, particularly thin, flat and rigid plates, employing hard materials which are previously granulated or reduced to powder, agglomerated with the aid of synthetic resins, comprising the steps of:(a) depositing on a conveyor belt a layer of binding agent, containing hard purverulent matter and dyes,(b) depositing cleaned granules on the layer of binding agent,(c) depositing base granules on the preceding layer,(d) pressing vibro-compressor rollers on the strip thus formed,(e) passing the strip into a polymerization furnace,(f) removing the excess granules by suction,(g) stripping the strip from the belt and effecting the finishing and checking operations.