A rock crushing assembly comprising an unprimed grinding cartridge (1 ') and a detonator (30) comprising a tubular detonator sleeve (31) of a polymeric material, said detonator sleeve (31) having a front portion (36) closed at a front end, a closed rear portion (37), a series of detonator members including an ignitable ignition device, and a detonator charge provided in a main part (32) of the detonator sleeve (31) between said rear portion (37) and said front portion (36) for burning it by means of the ignition device, main part (32) that can be introduced in the grinding cartridge (1 ') to prime the grinding cartridge, in wherein - the unprimed grinding cartridge (1 ') comprises an outer sleeve (2) with a terminal wall (3) at a first leading end and a plug (4) closing the outer sleeve (2) at a second trailing end ro, said outer sleeve (2) defining said terminal wall (3) and said plug (4), between them, a main chamber (5) having a first volume (V1), - said plug (4) has a channel central (19) which before the priming of the grinding cartridge (1 ') is closed by a sealing membrane (20), - a grinding powder charge (6) in a compressed state thereof, has a second volume ( V2), - said main part (32) of the detonator sleeve (31), which can be introduced into the grinding cartridge (1 '), has a third volume (V3), - said second (V2) and third volumes (V3). ) correspond together to said first volume (V1), - said sealing membrane (20) in said plug (4) can be penetrated by the detonator (30) when the front portion (36) of the detonator is pressed hard against the membrane of sealing (20), and the outer surface of the detonator sleeve (31) and a second section (18) of said central channel (19) have concentric shapes circular pieces, which allow the main part (32) of the detonator sleeve (31) to be introduced into the grinding cartridge (1 ') so that the grinding powder charge (6) is pushed laterally by the detonator sleeve (31) and completely fill the space (7) between said outer sleeve (2), said detonator sleeve (31), said terminal wall (3) and said plug (4), wherein said second section (18) of the central section is a front tubular section, and that, as the detonator (30) / detonator sleeve (31) moves successively further into the space (7) and soon it is also pressed onto the powder charge (6) , the powder is pressed laterally and compacted more and more, at the same time that the air that exists in the space (7) is expelled out through the central channel (19), not yet completely closed in the plug (4) , and finally, the rear portion (37) of the detonator sleeve (31), which has a diameter of etro (D5) greater than the main part (32) of the detonator sleeve (31) having a diameter (D4), is pressed into said second front tubular section (18) in the plug (4) by sealed contact between the rear portion (37) and the second front tubular section (18) until a shoulder (40) of the rear portion (37) is pressed against the projections (26) provided in the regions of the separation members (24) of a external part (11) of the plug (4) and against the areas of the upper surface (27) of the plug (4) between the separation members (24), therefore, at the same time as the rear portion (37) of the sleeve of detonator (31) and said second end tubular section (18) of said central channel (19) are brought into sealed contact with each other.
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