Prototype Borehole Miner Selectively Extracts Gold from . - CDCfrozen placer deposits from the surface through boreholes. Approach. Placer . hydraulic-lift-type pump to bring the ore to the surface as slurry. Full-scale jetting tests in . The gold-bearing gravel at this site is about 0.3 m (1 ft) thick and lies.gravel pumps for alluvial mining,Mining systems for small and medium size alluvial mining - 1Each alluvial mining set consists of 6-inch gravel pump, 6x4-inch high pressure water pump with pipes, hoses and other accessories needed to make it complete.
gravel pumps for alluvial mining