Abstract: A device for washing out and classifying organic, clay-like and other impurities from gravel, comprising a charging chute for feeding material into a washing trough. The washing trough comprises a conveyor belt designed to move in a direction perpendicular to the direction of the flow of material and a plurality of shower devices designed to act against the direction of travel of the belt. The conveyor belt is supported by a series of support rollers and tension rollers.

Abstract: A device for classifying superfine material from continuously fed granular solids which has a charging chute feeding the material into a washing trough. The washing trough is formed by a conveyor belt, which is mounted on a machine frame. A part of the conveyor belt forms the washing trough downstream of the charging chute. Another part of the conveyor belt is arranged below the charging chute, and is elevated against the direction of flow of the charged material. The charging chute has a false bottom above the washing trough and in the material feed area. The false bottom is adjoined by a gap on the head end of the washing trough. The gap extends over the entire width of the trough. The remaining area of the charging chute is perforated. In another embodiment, a vat is arranged at the end of the washing trough and extends over the entire width and depth of the washing trough. The vat has a flow of liquid passing over it and is filled with spherical elements of different shapes, sizes and surfaces.

Abstract: The apparatus serves for washing out and sorting organic, loamy and other impurities from continuously supplied coarse and fine granular solids, such as freshly dredged and treated gravel, with a chute 12 supplying the material to a washing trough 30 and spray jets 8, 10 for the washing liquid, consisting of an endless conveyor belt 29 supported on support rollers which are mounted on the machine frame 1 in such a manner that one section 9 of the conveyor belt is arranged downstream of the chute 12 and is formed as a washing trough 30, while the other section 11 of the conveyor belt 29 is arranged underneath the chute 12 and rising upwards against the direction of flow of the material supplied, the conveyor belt 29 being driven in the opposite direction to the direction of flow of the material supplied through the chute. Support rollers 6 and 17 are arranged to the side of the outer deflection pulley 32, in the direction of movement 4 of the conveyor belt 29.

Abstract: What is disclosed is method and apparatus for alleviating the problem with cleaning of sluice boxes. The invention is characterized by continuous cleaning of an endless belt onto which the heavy metal concentrate is projected by a conventional sluice boxes, shaker screens and the like, and eliminating the down time of the apparatus for cleaning, as in the prior art. This down time is approximately fifty percent of the time.

Abstract: A mineral slurry processing machine for recovering gold from raw fines. An elongated, rigid skid supports a frame plate coupled thereto by vibration transmitting bearings. An inclined processing ramp is adjustably mounted to the plate. An endless belt entrained over the ramp for continual rotation is equipped with a specially grooved working surface which helps separate gold from the slurry. A plurality of similar, regularly spaced apart grooves are cut into the exposed working surface of the belt, and the angulated configuration of the grooves facilitates particle separation and recovery. The belt is divided into a fine receiving region and an adjacent gold conveying region. Each groove includes a first segment which is "angled" with respect to the direction of travel of the belt, and a second segment which is substantially perpendicular to the direction of travel of the belt. Separate fine receiving and gold conveying regions thus exist.

Abstract: The device has an endless conveyor belt 29 supported on support rollers 17, 18, 18', 6, 32, 31, 7, which forms a washing trough 30, to which the material to be washed is fed via a chute 12. The device is mounted on a machine frame 1, which comprises individual supports 2 and 26. The entire device is fixed to a rectangular base frame 3 surrounding the device, which is pivotally arranged at one end transversely to the direction of travel 10 of the conveyor belt 29 on a bearer 4 and axles 5, while on the opposite side/end is fitted a height adjustment mechanism between the device or the frame 26 and the base frame 3.

Abstract: A continuous concentrator for high volume specific gravity separation of materials, particularly constituent materials of indigenous ores, in a counter-current process, the concentrator includes a continuous loop conveyor constructed with a conveyor bed on which are mounted periodic transverse riffles, and raised sidewalls for containing ore materials deposited on the bed from an ore feed; and, a bar sweeper constructed with a pair of continuous loop, link drives interconnected by transverse sweeper bars adjustably positioned over the conveyor bed, the bar sweeper being operated with the sweeper bars moving proximate the top of the conveyor riffles in an opposite direction from the movement of the conveyor, the rate of movement of the bar sweeper and conveyor being independently controlled for processing ores of different composition or consistency, wherein heavier metals and minerals are conveyed in one direction on the conveyor bed to one end of the conveyor for discharge and collection, and the lighter met

Abstract: An apparatus for separating gold and silver from a mixture of sand and rock comprises an endless conveyor supported on an inclined plane on a base. A motor connected to a source of electrical power is connected to a driven roller which operates the conveyor, liquid conducting pipes are placed adjacent the endless conveyor for discharging liquid onto the conveyor belt as it rotates upwardly, means for supplying liquid under pressure to the liquid conducting pipes is provided together with means for depositing a mixture of sand and rock onto the conveyor belt. The mixture of sand and rock is washed by streams from the pipes thus separating lighter materials from heavier particles, the former of which flow down the conveyor belt with the liquid into a trough and the latter heavier particles of gold and silver continue to adhere to the conveyor belt and are dislodged by liquid dripping on to the conveyor belt as it turns over the driven roller.

Abstract: Freshly dredged gravel is washed free of loamy and organic impurities while being continuously conveyed through a wash zone which includes a delivery chute and a plane endless conveyor band entrained in a direction opposite to that of the material delivery. The conveyor band is mounted in a housing which includes side walls closely adjacent the lateral edges of the conveyor band and a hopper below the conveyor band. The conveyor band is trained over a vertically adjustably mounted drive roller and a tensioning roller defining an upper and a lower course of the conveyor band therebetween. Two additional rollers are arranged in vertical alignment and between the first-named rollers, a lower one of these rollers guiding the lower conveyor band course and an upper one of these rollers being vertically adjustably mounted and arranged to depress the upper conveyor band course to form a basin in the wash zone to which the chute delivers the granular material.

Abstract: A Process and Apparatus for use in concentrating an aggregate mixture of particles, such as minerals and non-minerals wherein the mixture is introduced onto an inclined endless conveyor adjacent one edge of the incline and is advanced along or parallel to the incline while water is flowed across the inclined surface and the aggregate mixture during the advancement causing the lighter particles to flow with the water down and off of the inclined conveyor while the heavier particles cling to and are advanced with the conveyor surface to a collection area. The endless conveyor includes a plurality of slightly raised ribs on the upper surface which define recesses therebetween for catching and holding the heavier particles during advancement of the conveyor. The raised ribs can be formed into a number of various patterns. The endless conveyor also includes a plurality of horizontally spaced, downwardly projecting tits which form a reduced friction support surface and conveyor engagement drive means.