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With the increasingly demanding requirement of environmental protection in China, the proportion of non-cyanide gold extraction in the gold metallurgy industry is increasing. This paper summarizes the types, performance, and gold leaching efficiency of novel environment-friendly gold extraction agents emerging in recent years in China, and focuses on the analysis and discussion of the synthesis and gold leaching mechanism of these gold extraction agents. It is suggested that further optimization of the synthesis process of the novel environment-friendly gold extraction agents, the research on the gold leaching mechanism, and continuous enhancement of its adaptability to different types of gold ores, are the key research directions of the future popularization and application of this kind of gold extraction agents, in order to provide references for the realization of "green, environmentally friendly and safe gold metallurgy". [ABSTRACT FROM AUTHOR]

In this paper, the rules of the reaction kinetics in the vacuum roasting pretreatment of carbonaceous gold ores were studied. The activation energy and pre-exponential factor of vacuum roasting of carbonaceous gold ores were calculated by Arrhenius equation, and the kinetic models of different stages were defined. The results showed that temperature was the key factor to control the reaction rate during the vacuum roasting pretreatment process. The higher the temperature was, the greater the mass loss rate was. The vacuum roasting process was divided into two stages: 0-60 min and 60-120 min, which were controlled by interface chemical reaction and diffusion respectively. The appa-rent activation energy of the second stage was significantly lower than that of the first stage, indicating the thermal decomposition reaction and mass loss were mainly concentrated in this stage. [ABSTRACT FROM AUTHOR]

The Laizishan anticline area is an important part of the Ceheng — Wangmo high gold concentration area in Guizhou province. In the area, a super large gold deposit and many small gold deposits and gold spots are dis-covered. At present, the area still has a good prospecting prospect. This paper systematically summarizes the geological features and tectonic ore control law and points out that Laizishan anticline area has obvious three-stage tectonic ore control characteristics, and that the migration and enrichment of deep-sourced ore-forming fluids are closely related to the three-stage tectonics. The tectonic system composed of hidden syngenetic faults of late Paleozoic + regional Laizishan anticline, interlaminar slip structure + mineral-grade faults and folds has an obvious control effect on gold deposit for-mation. The study established the ore-controlling model of the Laizishan anticline area. [ABSTRACT FROM AUTHOR]

Baotou Xinda Company has left a large number of low-grade gold ore resources.To meet the requirement of mining operations, the low-grade gold ore resources are in urgent need to be utilized.The paper analyzed the feasibility to develop low-grade gold ore resources.The influence factors include a high level of gold market price, improving ore-dressing technology.Besides, the development agrees with the requirement of green mine construction.According to the minimum industrial grade index determined through re-calculation, the ore bodies are re-delineated, realizing full development and utilization of low-grade gold ore resources, prolonging mine service life, and creating good social and economic profits [ABSTRACT FROM AUTHOR]