How to Evaluate JinChan Laboratory Test Results

What Constitutes a Laboratory Test Result

A laboratory test cannot be evaluated correctly from a single final number. Interpretation requires consideration of the complete data set:

• initial Au grade;
• parameters of the test performed;
• Au concentration in the solution;
• Au grade in the solid residue;
• changes over time, if kinetics were investigated;
• repeatability or quality control of the analytical data.

A test result is not a single number, but a consistent set of analytical and process data.

Initial Gold Grade

A reliable value for the gold grade of the original material is required before leaching performance can be evaluated.

The primary sample provides the basis against which the solution and residue are interpreted.

If the primary sample was not representative or its initial gold grade was determined unreliably, the calculated performance of the subsequent test will also be unreliable.

Pregnant Solution Analysis

The gold concentration in the pregnant solution indicates the transfer of gold from the solid phase into solution under the conditions of the specific test.

Guangxi Senhe recommends regular monitoring of pregnant solution grade, pH, and JinChan concentration.

The sampling frequency should be defined by the program for the specific test.

Solid Residue Analysis

After leaching has been completed, the gold remaining in the solid phase must be evaluated. Residue analysis identifies how much gold did not transfer into solution under the conditions applied.

A high residual gold grade does not by itself explain the cause of incomplete recovery. The result must be interpreted together with data on the original ore and the test conditions.

In general, the result may be associated with the properties of the ore under investigation, the degree of mineral liberation, the selected leaching parameters, or the presence of components that affect the process. The cause cannot be established without further investigation.

Gold Recovery

Recovery in a laboratory leaching test describes the proportion of gold in the original material that was transferred into solution under the conditions of the specific test.

This value should not be confused with subsequent recovery of dissolved gold from solution onto activated carbon or by other methods. There is no single standard value defining a “good result” for all gold-bearing ores.

Checking Result Consistency

Analytical results for the original material, solution, and solid residue must be considered together. This approach helps identify clear inconsistencies in the analytical data and assess the plausibility of the result.

A complete material balance requires the actual masses, volumes, and analytical results of all relevant streams to be considered, including changes in mass and volume during operations and the removal of intermediate samples.

If the head analysis, solution, and residue results do not reconcile well, sample preparation, analytical data, and material accounting should be checked before a process conclusion is drawn from the final recovery percentage alone.

Leaching Kinetics

Final recovery describes the state at the end of the test but does not show how the process developed over time.

To investigate kinetics, the solution is analyzed at several time points defined by the test program. This makes it possible to see whether gold transfer into solution is continuing, whether the process is slowing, and whether the result has reached a practically stable level within the test period.

The official JinChan manufacturer also recommends monitoring pregnant solution grade at regular intervals.

The number and timing of sampling points are defined by the program for the specific test.

Why One Test Is Insufficient for a Substantive Conclusion

One test shows the result for a specific test portion under specific conditions. If the result is used to compare conditions or support subsequent scale-up, sample representativity, comparability of test portions, analytical quality, and reproducibility of the results must be considered.

Parallel or repeat determinations make it possible to assess variability and precision.

The number of repeat or parallel tests is defined by the study objective and the requirements of the QA/QC program.

Why High Residual Gold Does Not Automatically Mean “Add More JinChan”

If a significant amount of gold remains in the solid residue after testing, increasing reagent consumption is only one possible experimental variable. Residue analysis alone does not prove that insufficient JinChan dosage is the cause.

Before changing the conditions, the initial material characteristics, actual particle size, pH, reagent concentration, kinetics, and solution and residue analyses must be considered.

Changing one parameter does not guarantee an improved result. The official Guangxi Senhe instructions recommend determining conditions through a beneficiation test for the specific ore.

Comparing Several Sets of Conditions

When different conditions are compared, parameters should be varied in a controlled manner. Variables may include JinChan consumption or concentration, pH, particle size, slurry density, and process duration.

For a valid comparison, the parameter under investigation should preferably be varied while the remaining conditions are kept as comparable as possible.

Results are compared not only by final recovery, but also by kinetics, residual Au grade, reagent consumption, and process conditions.

When Laboratory Data Are Sufficient for the Next Stage

A laboratory result provides a basis for deciding on further testing, but does not by itself confirm the industrial performance of the conditions tested.

Before scale-up, the origin and representativity of the material, test parameters, initial Au grade, solution and solid residue data, repeatability, and limitations of the investigation must be understood.

For a new deposit, parameters must be verified on its own material.