METHOD FOR DETECTION OF AVERAGE GOLD CONTENT IN ORE BODIES Russian patent published in 2010 - IPC G01N33/24 B03B7/00 G01N1/22 

FIELD: measurement equipment.

SUBSTANCE: invention is related to method for detection of average gold content in ore bodies. Method includes taking and processing of trench samples with further performance of assay tests for two standard sub-samples of 50 g each. Then ore body is contoured by boundary value of gold content, duplicates of trench samples included into contour of ore body are weighed, and laboratory technological sample is made up with weight of more than 300 kg from 11-13 kg of trench samples duplicates with further enrichment of the whole mass of laboratory technological sample on gravity plant. After gravity plant, gravitational concentrates are produced with less than 3% of laboratory technological sample mass and with content of gold of more than 50 g/t, tails and intermediate product from cleaning of equipment. Then free ligature gold is extracted from each gravitational concentrate and intermediate product from equipment cleaning for further detection of its weight and conversion into chemically pure gold of average sample, weights of concentrates, tails and intermediate product yield from cleaning equipment are detected. Then two averaged sub-samples are selected with weight of 50 g each from all products of enrichment, assay tests are carried out, content of gold, close to true one, is calculated in ore body by weight of ligature gold and results of assay tests. Afterwards two averaged sub-samples are taken of 200 g each from enrichment products for performance of confirmatory cyanidation with specification of gold content, which is close to true value, and total weight of chemically pure gold is detected in enrichment products.

EFFECT: improved validity of gold content close to true one independently on size of its particles.

2 cl, 3 dwg, 6 tbl