The invention relates to a method for finely grinding a feed of carbonaceous material, in which the feed of carbonaceous material is introduced into the intake of a vibratory mill chamber (5) in the form of millimeter-or micron-sized particles, said vibratory mill comprising grinding media freely housed inside the chamber and adapted to grind particles. According to the invention, the chamber is made to vibrate such as to crush the particles (i) between the grinding media and (ii) between the grinding media and the inner peripheral wall of the chamber. According to the invention, an abrasive powder of mineral material (4) having millimeter-sized particles is also introduced into the intake of the chamber.
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