Code Br. Bottle Roll Tests
Test for cyanide leaching using bottle roll with the analysis of solutions received for gold usually is the first test for cyanide leachability of gold, which is to be carried out for ore. As a rule, testing is carried out during 72 hours, but if necessary, it can be carried out during more shorter or longer period of time. Test can be carried out for ores of any size, which fits the test bottle. However, the first test for cyanidation is recommended to carry out on pulverized -0.075 mm (≥90%) homogenized portion of the initial sample, to determine cyanide leachable gold presence, and in the case of positive results, to make a decision on the further testing program. These tests can be carried out on the same pulverized pulps, which were used for fire assay. Weight of each sample for test should be not less than 100g. Total content of cyanide leachable gold, determined in the initial bottle roll test, can be used later for monitoring of following column tests or for detailed research on the determination of metallurgical characteristics of ore. Particle size analysis should be carried out on the part of ore, which will be used for bottle roll cyanide leaching test in order to have information about distribution and recovery of gold by size fractions.
Basic Test Stages
BR1. Ore preparation
BR2. Determination of distribution of gold by size fractions in the initial ore
BR3. Determination of physical properties of ore
BR4. Primary estimation of leaching parameters
BR5. Evaluation of the main leaching parameters depending on the ore size
BR6. Study of leaching parameters depending on concentration of sodium cyanide in solution
BR7. Natural gold sorbents presence study (Preg Robbing)

CODE СТ. Percolation Leaching In Columns
The main testing stages
СТ1.Sample Preparation
CT2. Leaching
Biological oxidation