Abstract: In a gravity flow amalgamator an elongated upright housing is provided with a removable bottom end tray containing a bath of mercury for collecting gold. A pair of partition walls extend inward and downwardly in parallel relation transversely of the housing to form a water channel downstream tortuous path characterized by return bends with each wall of the pair of walls respectively attached to the inner surface of the housing opposing side walls intermediate their height to define fluid compartments at opposite sides of the housing. The water channel discharges the water into one of the fluid compartments.

Abstract: A placer stream dredging head including a relatively short section of open end pipe coaxially secured to the depending end of a boat supported gangue tube. A closed bottom cage is connected with the depending end of the pipe section. A first force pump supplied water pressure hose is connected with the upper end portion of the pipe section in a manner to induce a jet action pressure reduction for lifting gangue into the gangue tube. A second force pump supplied water pressure hose is secured to the upper end portion of the pipe section and divided for exhausting downwardly directed high velocity water streams at diametrically opposite sides of the cage.