Ore Deposit - Mineral deposit of sufficiently high concentration of a mine to be profitable and process using current technology and under current economic condition.
Ore Grade - is the concentration of economic mineral or metal in an ore deposit.
It's an concentration of diamond deposit that is economically feasible to extract diamonds for profit with current technology and economic environment. Gange or metalliferous diamonds are diamonds that have no economic value.
Diamond ore is fed into a vibrating grizzly, a screen of steel bars, where rock either falls through the bars or is assisted on its way by a rock breaker (similar to a large jackhammer). A jaw crusher then breaks the rock down even further. Ore which now meets the size requirements goes to screening and washing circuits to remove sand and mud and then to the dense media separation circuits. Oversize material is conveyed to a cone crusher where rock is squeezed tightly between inner and outer walls, exiting through a circular gap at the bottom.
The crushed ore is mixed with finely ground ferrosilicon (dense media) slurry at a density of approximately 2.65g/cm3, near the density of diamond. Separation occurs in the cyclone by swirling the mixture at high velocities driving heavy minerals to the conical wall, where they sink to the bottom and are sent to the X-ray separator, while float waste minerals (kimberlite) are sucked from the center of the vortex. Using a magnet the ferrosilicon is recovered from the floats and sinks for re-use. Cyclones are about 99.999% efficient at concentrating diamonds and similarly dense minerals from the original ore.
The X-ray separator system acts on a thin stream of particles from the concentrate accelerated off a moving belt into the air, where they encounter an intense beam of X-rays. Any diamond fluoresces in the X-rays, activating a photomultiplier that triggers a jet of air, deflecting the diamonds (red) into a collector bin.
The crushed ore is mixed with finely ground ferrosilicon (dense media) slurry at a density of approximately 2.65g/cm3, near the density of diamond. Separation occurs in the cyclone by swirling the mixture at high velocities driving heavy minerals to the conical wall, where they sink to the bottom and are sent to the X-ray separator, while float waste minerals (kimberlite) are sucked from the center of the vortex. Using a magnet the ferrosilicon is recovered from the floats and sinks for re-use. Cyclones are about 99.999% efficient at concentrating diamonds and similarly dense minerals from the original ore.
The X-ray separator system acts on a thin stream of particles from the concentrate accelerated off a moving belt into the air, where they encounter an intense beam of X-rays. Any diamond fluoresces in the X-rays, activating a photomultiplier that triggers a jet of air, deflecting the diamonds (red) into a collector bin.
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