An elutriation apparatus has a mechanism adapted to move water along a path, the water entraining material particles of different density, and a plurality of elutriation columns interfaced to the mechanism adapted to move the water with entrained particles, the elutriation columns interfaced along the path, each elutriation column having a vertical bore with water controlled to travel up the vertical bore at one velocity and having also a capture element at the bottom of the bore. As the water with entrained particles passes over each interface to an elutriation column along the path, particles of a density sufficient for the particles to settle in the elutriation column at a velocity greater than the upward velocity of water in the bore of the elutriation column, settle to the bottom of the column, and particles of lesser density pass on to a next elutriation column interfaced along the path.

The invention relates to a system and method for separating pieces having a second density (9c) from granular material. The system includes a separation tank (2) comprising a first side wall (12) provided with a tank outlet (6), a bottom (7), a pipe (4) defining a channel (3a) for allowing a slurry to enter the tank (2). A pipe outlet (4b) is spaced apart from the tank outlet and arranged vertically below the outlet (6). The separation tank (2) comprises a trap (5) for collecting said pieces. A separation chamber (8a) is arranged in liquid communication with the pipe outlet to allow slurry to enter the separation chamber. The pipe outlet is in a lower third of the separation tank facing the bottom of the tank so that slurry flows vertically through the pipe outlet towards the bottom causing a turbulent flow of the slurry in the tank.

The invention relates to a system and method for separating pieces having a second density (9c) from granular material. The system includes a separation tank (2) comprising a first side wall (12) provided with a tank outlet (6), a bottom (7), a pipe (4) defining a channel (3a) for allowing a slurry to enter the tank (2). A pipe outlet (4b) is spaced apart from the tank outlet and arranged vertically below the outlet (6). The separation tank (2) comprises a trap (5) for collecting said pieces. A separation chamber (8a) is arranged in liquid communication with the pipe outlet to allow slurry to enter the separation chamber. The pipe outlet is in a lower third of the separation tank facing the bottom of the tank so that slurry flows vertically through the pipe outlet towards the bottom causing a turbulent flow of the slurry in the tank.

A panning tool is described and comprises a sifting scoop comprising an elongated half sphere of proportional dimensions. The left side wall, right side wall, and back wall of the sifting scoop define a reservoir for collecting sediment and holding precious metals and gems separated from the sediment during and after panning. The floor extends forwardly from the back side and can comprise riffles, furrows, or be flat. The panning tool comprises a connection body. The connection body is affixed to an interior face of the sifting scoop. Methods of using the panning tool and manufacturing the sifting scoop are also described.

A panning tool is described and comprises a sifting scoop comprising an elongated half sphere of proportional dimensions. The left side wall, right side wall, and back wall of the sifting scoop define a reservoir for collecting sediment and holding precious metals and gems separated from the sediment during and after panning. The floor extends forwardly from the back side and can comprise riffles, furrows, or be flat. The panning tool comprises a connection body. The connection body is affixed to an interior face of the sifting scoop. Methods of using the panning tool and manufacturing the sifting scoop are also described.

The sluice box mouth and sifter pan system includes a sluice box mouth and a plurality of stackable sifter pans. The sluice box mouth includes a substantially planar bottom plate with a first upright sidewall extending from a first edge of the plate and an opposing second upright sidewall extending from an opposing, second edge of the plate. One of the sifter pans can be removably positioned on the bottom plate. The first and second sidewalls each include an arcuate portion for engaging a peripheral wall of the pan and securing the pan to the sluice box mouth.

The sluice box mouth and sifter pan system includes a sluice box mouth and a plurality of stackable sifter pans. The sluice box mouth includes a substantially planar bottom plate with a first upright sidewall extending from a first edge of the plate and an opposing second upright sidewall extending from an opposing, second edge of the plate. One of the sifter pans can be removably positioned on the bottom plate. The first and second sidewalls each include an arcuate portion for engaging a peripheral wall of the pan and securing the pan to the sluice box mouth.

The sluice box mouth and sifter pan system includes a sluice box mouth and a plurality of stackable sifter pans. The sluice box mouth includes a substantially planar bottom plate with a first upright sidewall extending from a first edge of the plate and an opposing second upright sidewall extending from an opposing, second edge of the plate. One of the sifter pans can be removably positioned on the bottom plate. The first and second sidewalls each include an arcuate portion for engaging a peripheral wall of the pan and securing the pan to the sluice box mouth.

The sluice box mouth and sifter pan system includes a sluice box mouth and a plurality of stackable sifter pans. The sluice box mouth includes a substantially planar bottom plate with a first upright sidewall extending from a first edge of the plate and an opposing second upright sidewall extending from an opposing, second edge of the plate. One of the sifter pans can be removably positioned on the bottom plate. The first and second sidewalls each include an arcuate portion for engaging a peripheral wall of the pan and securing the pan to the sluice box mouth.

The invention relates to a system and method for separating pieces having a second density (9c) from granular material. The system includes a separation tank (2) comprising a first side wall (12) provided with a tank outlet (6), a bottom (7), a pipe (4) defining a channel (3a) for allowing a slurry to enter the tank (2). A pipe outlet (4b) is spaced apart from the tank outlet and arranged vertically below the outlet (6). The separation tank (2) comprises a trap (5) for collecting said pieces. A separation chamber (8a) is arranged in liquid communication with the pipe outlet to allow slurry to enter the separation chamber. The pipe outlet is in a lower third of the separation tank facing the bottom of the tank so that slurry flows vertically through the pipe outlet towards the bottom causing a turbulent flow of the slurry in the tank.