An aggregate washing system, comprising: a slurry mixer, said slurry mixer comprising: a tank disposed at a first incline angle, the tank having a rearward portion having a rear wall and first and second side walls with an aggregate material inlet (Is) for receiving aggregate material, the tank having a forward portion with a tank outlet (Os) comprising an opening in the tank, said rear wall having an upper edge disposed higher than said opening of said tank outlet (Os); a water inlet for supplying water to said tank; a propulsion assembly rotatably supported within said tank and extending from the rearward portion to the forward portion, wherein said propulsion assembly is configured to rotate within said tank so as to agitate said water and said aggregate material to form a slurry, wherein said tank is configured to retain water that does not exit said tank outlet (Os), wherein said tank outlet (Os) is disposed forward of said aggregate material inlet (Is) along a conveyance path, and wherein said propulsion assembly is configured to rotate within said tank so as to convey slurry along said conveyance path from said aggregate material inlet (Is) to said tank outlet (Os); a dewatering mechanism disposed to receive said slurry from said tank outlet (Os) of said slurry mixer, said dewatering mechanism comprising: a vibrating screen having a screen media deck for separating oversize material in said slurry from water and undersize material in said slurry, the screen media deck having a plurality of openings for receiving water and undersize material, the screen media deck having an end over which oversize material is deposited; and at least a first washing element disposed to direct water toward said screen media deck. a slurry mixer, said slurry mixer comprising: a tank disposed at a first incline angle, the tank having a rearward portion having a rear wall and first and second side walls with an aggregate material inlet (Is) for receiving aggregate material, the tank having a forward portion with a tank outlet (Os) comprising an opening in the tank, said rear wall having an upper edge disposed higher than said opening of said tank outlet (Os); a water inlet for supplying water to said tank; a propulsion assembly rotatably supported within said tank and extending from the rearward portion to the forward portion, wherein said propulsion assembly is configured to rotate within said tank so as to agitate said water and said aggregate material to form a slurry, wherein said tank is configured to retain water that does not exit said tank outlet (Os), wherein said tank outlet (Os) is disposed forward of said aggregate material inlet (Is) along a conveyance path, and wherein said propulsion assembly is configured to rotate within said tank so as to convey slurry along said conveyance path from said aggregate material inlet (Is) to said tank outlet (Os); a tank disposed at a first incline angle, the tank having a rearward portion having a rear wall and first and second side walls with an aggregate material inlet (Is) for receiving aggregate material, the tank having a forward portion with a tank outlet (Os) comprising an opening in the tank, said rear wall having an upper edge disposed higher than said opening of said tank outlet (Os); a water inlet for supplying water to said tank; a propulsion assembly rotatably supported within said tank and extending from the rearward portion to the forward portion, wherein said propulsion assembly is configured to rotate within said tank so as to agitate said water and said aggregate material to form a slurry, wherein said tank is configured to retain water that does not exit said tank outlet (Os), wherein said tank outlet (Os) is disposed forward of said aggregate material inlet (Is) along a conveyance path, and wherein said propulsion assembly is configured to rotate within said tank so as to convey slurry along said conveyance path from said aggregate material inlet (Is) to said tank outlet (Os); a dewatering mechanism disposed to receive said slurry from said tank outlet (Os) of said slurry mixer, said dewatering mechanism comprising: a vibrating screen having a screen media deck for separating oversize material in said slurry from water and undersize material in said slurry, the screen media deck having a plurality of openings for receiving water and undersize material, the screen media deck having an end over which oversize material is deposited; and at least a first washing element disposed to direct water toward said screen media deck. a vibrating screen having a screen media deck for separating oversize material in said slurry from water and undersize material in said slurry, the screen media deck having a plurality of openings for receiving water and undersize material, the screen media deck having an end over which oversize material is deposited; and at least a first washing element disposed to direct water toward said screen media deck.