The Occurrence of Gold
The free gold distribution in ores changes a great deal, anywhere from five percent to ninety five percent. The free gold distribution in the ore can be uniformly dispersed all over the ore but may perhaps in addition be spread throughout the ore kind and inside any heading or working face. Test work and classification on some ore forms can be very complicated and these ore forms are in addition the ones that have a tendency to causing the most trouble in the process plant. Ores that show a discrepancy broadly in gold distribution confer the most problems in the process plant. The distribution of gold inside any ore sort can be divided into three most important groups. These groups include free gold, sulphide associated, and silicates and gangue. Free gold takes place as metallic, native gold and electrum. This gold is defined due to the fact that it is comparatively dense. The density of the material is in most cases more than specific gravity 15. In the case of sulphide associated, gold that is sheltered on and inside the pattern at a teensy size or less than that that for the most part shows refractory features. This material would in most cases have a specific gravity that is higher than 3.5 and under 7.0. In the case of silicates and gangue, the gold can be hooked on to a gangue particle on the top and is open to cyanidation. It is in addition possible that the gold that is trapped inside the gangue minerals at a size that is less than the grain size. This means that when the mineral is ground, the gold is not freed and stays stuck inside. The density of this material can be very low and have a specific gravity of close to 2.65 to 3.0. From these most important groups the first two are a specific goal for gravity means of recovery. The last one is too close to gangue density to be efficiently detached.