Abstract: A gold mine in Henan is a low-grade gold-copper symbiotic deposit. In order to realize the efficient utilization of low-grade gold and associated copper resources and maximize the economic bene‐ fits of the mine，the industrial index demonstration of the deposit is carried out. On the basis of systemati‐ cally summarizing the geological characteristics，mining technical conditions and ore processing technical performance of the deposit，the boundary grade is determined by sample statistics method，and the critical grade of gold is calculated to be 1.80 g/t according to the principle of profit and loss balance. Combined with the actual situation of the mine，three sets of industrial index schemes with the lowest industrial grade of 1.4 g/t，1.6 g/t and 1.8 g/t are proposed. Through the ore body test circle，resource trial calculation， mining and selection technical index comparison and technical and economic evaluation，the schemes are comprehensively compared and selected. The results show that the differences in resource quantity，grade and economic benefits of the three schemes are small，and the mines can achieve profitability .Considering the resource utilization rate，ore body continuity，production service life and technical and economic con‐ ditions，it is recommended to use the industrial index as the boundary grade of 0.8 g/t，the minimum indus‐ trial grade of 1.6 g/t，the minimum recoverable thickness of 1 m，and the thickness of the stone removal of 2 m. When the tunnel is up and down，the removal length of the ore-free section is 15 m，and 30 m is tak‐en when there is no correspondence. When the thickness is less than 1 m，the product of thickness and
grade is used to circle the ore. The research results can provide a basis for the rational development，utili‐
zation and dynamic management of mine resources.

Key words: gold-copper symbiosis, low-grade deposit, commercial index, profit and loss balance taste