The underground mine is accessible either via an incline ramp or a mine shaft. Ore extraction started at level 500, from which the process proceeds upwards towards the bottom of th open-pit. Fully excavated primary stopes are filled with waste rock. From each stope, the ore is carried to an underground crushing station. The crushed ore is transferred via a conveyor belt to crushed ore silos located close to the mine shaft and further to a skip via a measuring pocket. The ore is hoisted through the shaft to an unloading silo located in a 70-meter-tall lifting tower, from where it is forwarded to the concentration process Chromite is the commercial name for iron chromium oxide (FeCr2O4), a mineral containing chromium (a transition metal with multiple oxidation states) and iron oxide. In its purest form, chromite comprises chromium (Cr2O3) at 68% and iron oxide (FeO) at 32%. Chromite occurs exclusively in ultramafic rocks such as dunite, peridotite, pyroxenite and serpentinite. High purity deposits are rare owing to replacement by certain elements. In nature, ferrous iron tends to be partially replaced by magnesium, while chromium may be partially replaced by aluminium or ferric iron As a result, a range of chromite grades can occur in any deposit, with each grade suitable for a specific application. Grades produced include metallurgical and non-metallurgical applications .
concentrated at two concentration plan in lump and fine concentrate. In the first phase, the ore is crushedfor further processing. At the lump concentration plant, lump concentrate is separatedfrom thecrushed ore using the sink-and-float method.The grain size is 12–100 mm. After grinding ,feed materialfrom the fine Concentration plant is concentrated into fine concentrate using spiral separators. At the fine concentration plant, the ore is concentrated into fine concentrate using gravitational and highly magnetic .concentration methods .
1 -foundry grade : Cr2O3 min. 46% sizing
AFS 40-50, 45-55, 50-60
2 - efractory grade : Cr2O3 min. 46%, sizing typ. 98% < 2 mm
3 - hemical grade : Cr2O3 typ. 45 – 47%, sizing typ. 98 % < 1 mm