METHOD OF PREPARATION OF ANALYTICAL WEIGHTED PORTION OF GOLD-BEARING ORE FOR ASSAY Russian patent published in 2006 - IPC C22B11/02 G01N1/28 

FIELD: metallurgy of noble metals.

SUBSTANCE: proposed method includes selection of analytical weighted portions from ordinary samples of ore, analysis of weighted portions, forming and analysis of group sample before estimation of mass of weighted portion, estimation of mass of weighted portion, selection of weighted portion from sample at size of grain of 1-0.04 mm and final grinding of weighted portion to 0.2-0.04 mm. During analysis of weighted portions, approximate magnitude of content of gold C_o.s. in ordinary samples is determined, group sample is formed from ordinary samples at minimum content of gold, analytical weighted portions are taken from group sample and content of gold C_i is determined, average content of gold in group sample C_g.s. is calculated, minimum mass of analytical weighted portion for group sample M_g.s.(g) is set at ratio П_i=2(C_i-C_g.s.)/(C_i+C_g.s.)≤Д_g.s., where П_i is relative discrepancy between content of gold in i-analytical weighted portion and average content of gold in group sample; Д_g.s. is permissible relative discrepancy between results of determination of content of gold in group sample during laboratory monitoring; then estimation of mass is performed for ordinary samples M_o.s. by the following formula: M_o.s.= (M_g.s..Д_g.s./(C_o.s..Д_o.s.), where Д_o.s. is permissible discrepancy between results of determination of content of gold in ordinary sample during laboratory monitoring.

EFFECT: enhanced rapidness and reliability; low cost of assay.

1 dwg, 2 tbl, 1 ex