Zn Assays: Compare 2 & 4 Acid Digestion
When doing a ICP assay, you can choose between 2 or 4 Acid Digestion. Here is the basic difference: 2-acid digestion is good for sulfide and carbonate material but does not digest the more resistant minerals such as unaltered silicates and some oxides. The 4-acid digestion is a near “total” digestion and will digest almost […]
Sepor Mini Jaw Crusher
The SEPOR Mini-Jaw Crusher is suitable for crushing small quantities of rock and other friable material, ranging in hardness from hard quartz to relatively soft claystone. It is available with a variety of wear surfaces: Hardened steel alloy plates for users not concerned with iron contamination and 85% Alumina […]
Mineralogy Point Count Procedure
The point count procedure was to select an appropriate magnification for the micro mount ranging between 100 – 1000 times normal, and then setting a 10×10 square graticule randomly on the field. Mineral grains which were intersected by the graticule cross hairs, were identified and recorded and entered directly into the computer using a […]
Laboratory Flotation Testing
Batch Laboratory Flotation Testing starts from the 3 fundamental types of flotation processes or methods which can be classed as either: Bulk flotation Differential flotation Sequential flotation While all flotation processes are selective or differential in that one mineral or group of minerals is floated away from accompanying gangue, bulk flotation generally refers to separation […]
Cyanide Gold Extraction Process
Here is a method on how to conduct a cyanidation bottle roll test AKA Cyanide Gold Extraction Process: Riffle out 400 grams of the ore. Grind to pass 200 microns (“13-15 minutes for hard rock ores;” 10 minutes for oxidized ore) grind at 35% solids. Wet screen. Retain and dry fractions. Settling overnight of – 45um […]
Cyanide Bottle Roll Leach Test – Leaching Procedures
List Equipment Required to Perform of a Standard Bottle Leach Test Winchester bottles, with tops Plastic tape to seal tops of bottles Flexible air lines for possible aeration requirements Magnetic or mechanical stirrer for agitation Timer, pH meter, thermometer and weighing device Leachants, i.e. acid, alkaline or neutral solutions, or specific solutions Filter: vacuum or […]
Sulphide Leaching
Methods of leaching sulphide ores can be: in absence of oxidizing agents in presence of oxidizing agents Bacterial leaching Absence of oxidizing agents Acid leaching: Dilute acids dissolve some metal sulphides with liberation of H2S, e.g. ZnS + 2H+ ^ Zn2+ + H2S Three types of sulphides can be encountered. Completely soluble sulphides: Zns, CoS, […]
Laboratory Magnetic Separator & Test Procedure
This Laboratory Magnetic Separator is a high intensity dry device which uses a rotating iron disc to concentrate the magnetic field and remove the magnetic particles from the non-magnetic. It essentially consists of an electromagnet (the applied current is controlled by a rheostat) which produces a magnetic field across the air gap and a belt which […]
Magnetic Separation Method
Magnetic separation is a process used to separate materials from those that are less or nonmagnetic. All materials have a response when placed in a magnetic field, although with most, the effect is too slight to be detected. The few materials that are strongly affected (magnetised) by magnetic fields are known as “Ferromagnetics”, those lesser […]
Characteristic of Elementary Assay Curve
The incremental assays obtained for each S.G. are plotted against the average cumulative % weight of sinks and floats. This curve shows the assay of the richest particles in a float or sink. If it is used in conjunction with the cumulative assay of floats or sinks curve, it indicates the spread of assay values obtained […]