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The very low content of gold in the ore to extract gold ore crushing and grinding and beneficiation methods of pre-enrichment or separation of gold from ore manipulation. Use more gold mineral re-election and flotation re-election law occupies a very important position in the placer gold production, the flotation method of rock gold mine wide use of the dressing method, about 80 percent of China\\ s rock gold mine using this method with gold, mineral processing technology and equipment have been greatly improved.
(A) Crushing and grinding
    According to the survey, with gold plant to use more jaw crusher for primary crushing, standard cone crusher machine broken, while crushing the short head cone crushing machine and roll crushing machine. Small with gold factory most of the two sections of a closed-circuit crushing, large with gold plant using three sections of a closed-circuit broken ore process.
In order to improve mineral production capacity, the equipment potential, and the crushing process was modified so that the grinding machine utilization factor increased, the main measures taken to implement and more broken and less grinding, and lower into the grinding of ore particle size.
(B) the re-election
    Re-election in rock gold mine application, as an auxiliary process, recovery of coarse gold in the grinding circuit, to create favorable conditions for the flotation and cyanidation process and improve the beneficiation indicators to improve the total recovery of gold to increase production played an active role and reduce costs. Shandong Province has about over 10 with gold plant using this process of re-election, the average total recovery can be increased by 2% to 3%, the economic efficiency of enterprises, according to incomplete statistics, the annual profit of several million dollars. Henan, Hunan, Inner Mongolia and other provinces (regions) to achieve good results, the main equipment used in the chute, shaker, jigger and short cone cyclone. Floating – heavy joint process (flotation tailings from the majority of our gold mines, with the re-election) is suitable for the future should be to promote the stage grinding stage sorting process, to promote this can be as early as received beneficiation principle.
(C) flotation
    According to the survey, about 80% of rock gold mine with gold flotation, the output of concentrate sent to more than the non-ferrous smelter processing. Cyanide gold extraction by the growing and businesses to enhance economic efficiency, reduce concentrate transport losses in recent years, the product structure of the larger changes, mostly to take place (of course due to the contradiction between the smelt and pricing and other issues, forcing the mine to place its own) to promote the flotation process development, a considerable position in the gold production. Usually there are two processes of flotation and flotation. New progress in recent years in terms of process transformation and reagent addition system, the flotation recovery has improved markedly. According to the country more than 40 selected gold plant, the flotation process indicators survey showed that the sulfide ore flotation recovery of 90%, a few up to 95% ~ 97%; rate was 75% in the oxidized ore; individual to achieve 80% ~~ 85%. In recent years, innovative transformation in the flotation process and scientific research many and obvious effect. Stage grinding and floating processes, re – floating process, etc., is the main trend of China flotation process development. Using heavy – floating process, such as Xiangxi Gold stage grinding stage sorting to get a better indicator, the recovery rate of more than 6%; Jiaojia gold, Wulong gold, gold, Wenyu Dongchuang gold also to obtain a certain effect. Again Xincheng Gold Mine, the original process for ore flotation, because of high mud (Ore mud, coupled with mining tailings filling strong enough, into the part of the sediment) beneficiation indicators continuous decline. Examine the test, the use of sediment sorting process, the recovery rate from 93.05% to 95.01% and concentrate grade of 135g / t to 140g / t, and stable production. Declining Jinchangyu Gold ore grade thus making flotation index lower, with the Shenyang Gold Institute in cooperation pilot study branch of the flotation process flotation concentrate grade. The research results (Gold Corporation in January 1988 passed the technical appraisal), a new revelation for the Flotation Process. Of course, the flotation method and other methods is not a panacea, not all gold-bearing ore are valid, mainly but also consider the nature of the ore, in the choice of process, the need for a wide range of demonstration and test.
In recent years, in order to improve the separation effect in the process of continuous improvement at the same time, the system of reagent addition and mixing medication made many improvements and automatic control of the dosing to achieve new progress.
(D) of the election – hydrometallurgical gold extraction process
    Amalgamation gold extraction
    Mixed mercury in gold extraction process is an ancient gold extraction process, both simple and economical, [FS: PAGE] suitable for gold recovery of coarse-grained monomer. Many gold mines in China also followed this approach. With the development of gold production and scientific and technological progress, the gold extraction process of the amalgamation has been improved and perfected. Due to increasingly stringent environmental protection requirements, some mine canceled amalgamation operations, replaced by the re-election, flotation and cyanidation gold extraction process.
    Mixed with mercury in gold extraction process is still an important role in gold production, application examples, both at home and abroad. Zhangjiakou, Hebei, Liaoning Erdaogou, Jilin Jiapigou, Shandong Yinan, etc. a lot of gold application of this technology. For the Liaoning Erdaogou gold original single flotation process, according to the nature of the ore to amalgamation and flotation processes, the total recovery rate of 7.81% (mixed with mercury recovery rate of 64.6%), and tailings grade of 0.74g / t dropped to 0.16 g / t year won the effectiveness of 158 million. Mixed with mercury in gold extraction process the key is how to take protective measures, elimination of toxic mercury pollution.
    Cyanide gold extraction process
    Cyanide gold extraction process is the modern main method of extracting gold from ore or concentrates. Cyanide gold extraction process include: cyanide leaching, leaching pulp washing filter, cyanide solution or a few of the basic processes of extraction of gold in the cyanide pulp and finished smelting. China\\ s gold mines existing cyanidation plant basically two types of gold extraction process, a class is based on the thickener continuous countercurrent washing, the recovery of gold precipitation with zinc replacement of the so-called conventional cyanide gold extraction process (CCD and CCF method), and the other without filtration and washing, the use of activated carbon without filtering of the recovery of gold from the cyanide pulp adsorption cyanide CIP process (CIP and CIL France).
    Conventional cyanidation gold extraction process was divided into two different materials: one is to deal with flotation gold concentrate or deal with amalgamation, re-election of the cyanide tailings plant. This process many large state-owned mines. Such as Hebei Jinchangyu; Liaoning Wulong Henan Yangzhaiyu; Zhaoyuan, Metro, Jiaojia Island Gold. Another is to deal with muddy oxidized ores, the use of whole mud mixing cyanide gold extraction plant. Such as Jilin trench; Heilongjiang Tuanjiegou,; Anhui Newbridge gold and silver mine and other mines.
    In the early 1930s have begun to use the cyanide gold extraction process. Chinkuashih gold in Taiwan in 1936 to 1938 period, the use of cyanide – zinc replacement process to extract gold, with an annual output of gold 150,000 two.
    Into the 1960s, in order to adapt to national economic development, vigorously develop the production of mined gold in some mines have adopted intermittent mechanical agitation cyanidation gold extraction process, and continuous stirred tank cyanidation gold extraction process to replace the percolation cyanidation The gold extraction process. In 1967, the first gold Mountain and exquisite with gold factory in Shandong Zhaoyuan continuous mechanical agitation cyanidation process produces gold cyanide gold extraction increased from 70% to 93.23%, from continuous mechanical agitation cyanidation gold extraction process rapidly in the major gold promotion. 1970 the annuity Jinchangyu gold 1977 Wulong gold cyanidation plant have been put into operation since the country began to put into operation a number of mechanical agitation cyanidation plant, the cyanide gold extraction process has entered a new stage of development.
    The continuous development of gold production and the rapid development of gold resources, muddy gold oxide ore since the 1980s a substantial increase in the development of all slime cyanide agitation leaching of such ores, and in Heilongjiang Tuanjiegou gold to build a day 500t ore cyanidation plant into production in 1983. Since then, the whole mud cyanidation gold extraction process increasingly promote the use of using this method worked in Henan, Jilin, Hebei, Shaanxi, Inner Mongolia and other places to build factories gold extraction. At the same time, to solve the difficulties of argillaceous oxide ore in the solid-liquid separation of the thick filter, Changchun Gold Research Institute in November 1979 of Tuanjiegou gold ore without filtering CIP gold extraction process carried out two-year pilot study has been successful. On this basis, in Spirit Lake gold mine in Henan Province in August 1984 to design the use of domestic equipment to the completion of processing 50t of ore in the first CIP gold extraction plant. Of cyanidation gold extraction process represents a major step forward. CIP gold extraction process to become one of the processing argillaceous rock gold mine oxide ore gold method of real estate. Built a CIP gold extraction plant in Jilin, Henan, Inner Mongolia, Shaanxi and other places since then.