Abstract: The invention relates to a method and to an apparatus for crushing and fine grinding of solid particulate materials, e.g. clinkers used in cement, utilizing a conventional ball mill. More particularly, the invention involves use of such a ball mill in the primary crushing of the material (which use is advantageously limited to the preliminary crushing operation requiring minimum energy consumption), and of a jet mill in the final crushing (conventionally done in a ball mill also). The jet mill is incorporated in a secondary independent grinding circuit which grinds the material to the required fineness value.