Characteristics of Main Orebody of Jiagantan Gold Deposit and Comparative Analysis with Regional Typical Gold Deposit in Gannan Area
Received date: 2021-12-08
Revised date: 2022-05-16
Online published: 2023-03-27
Gannan area is an important gold concentration distribution area in Gansu Province.Through more than 30 years of gold prospecting and large-scale exploration since the 1990s，three super-large gold deposits with gold resources of 100 t have been investigated or explored in detail，including Dashui gold deposit in Maqu County，Zaozigou gold deposit in Hezuo City and Jiagantan gold deposit in Xiahe County.Among them，Jiagantan gold deposit has identified 153 t of gold resources.The gold deposits in Gannan area have the cha-racteristics of agglomeration distribution，forming two basically mature gold enrichment areas，namely Xiahe-Hezuo gold enrichment area in the northwest of Gannan area，and Zhongqu-Dashui gold enrichment area in the southwest of Gannan area.The exploration and research degree of Jiagantan gold deposit，Zaozigou gold deposit and Dashui gold deposit in Gannan area are relatively high.In the past，comparative analysis on characteristics of main orebodies of different degrees have been carried out，which provided a good basis for the study of main orebodies of Jiagantan gold deposit and its gold enrichment area.Based on the brief introduction of the distribution characteristics of gold deposits in two gold enrichment areas and the geological characteristics of Jiagantan gold deposit in Gannan area，the characteristics of main orebody of Jiagantan gold deposit were systematically summarized from the aspects of the spatial distribution，scale，shape，grade and resource distribution of the main orebody.Jiagantan gold belt is more than 1 500 m in length and 300~500 m in width.The 17 main ore bodies are roughly parallel distributed in echelon shape，530~1 480 m in length and 200~350 m in control slope depth.The scale of the main orebody is mainly medium-sized，and the resources of single main orebody are 1.8~12.7 t，and the scale of resources are mainly small，accounting for 2.04%~14.42% of the identified resources in the mining area.It provides an example for the study of the main orebodies of the super-large gold deposits.The main ore-controlling factors and main orebody characteristics of five large and medium-sized typical gold deposits in the two gold enrichment areas were compared and analyzed from four aspects of ore-bearing strata，ore-controlling faults，the relationship between intermediate-acidic dikes and gold mineralization，and surrounding rock alteration.It is considered that the main ore-controlling factors are fault structure and intermediate-acid dikes dominated by quartz diorite （porphyrite） dike and granodiorite （por-phyrite） dike.Through the comparative study of the main orebodies characteristics of five typical gold deposits，it is considered that compared with the other four gold deposits in the two enrichment areas，the main orebody of Jiagantan gold deposit is larger，but the average grade is 2.70×10-6，the proportion of 57.27% of the main orebody is lower than that of 75.34%~79.37% of other deposits.The above understanding further deepens the study of main orebody characteristics of Jiagantan gold deposit and its regional typical gold deposits，and provides an example for the comparative study of the characteristics of the main orebody in gold enrichment areas.The exploration depth of Jiagantan gold deposit is generally shallow and the exploration degree is generally low，the main orebody resource proportion is not more than 75% of the average of Gannan area.The single main orebody resources have not been a large scale orebody，the ore belt and the main orebody group has not yet been fully controlled，and the main orebody of deep stability to extension.It edicates that Jiagantan gold deposit still has great exploration space and prospecting prospect.If the near peripheral and deep prospecting is increased，the scale of the deposit and the amount of gold resources in the mining area will be greatly increased.
Yaoyu CHEN , Xinghua YAO , Xiangsheng TIAN , Lanjun FENG . Characteristics of Main Orebody of Jiagantan Gold Deposit and Comparative Analysis with Regional Typical Gold Deposit in Gannan Area[J]. Gold Science and Technology, 2023 , 31(1) : 50 -63 . DOI: 10.11872/j.issn.1005-2518.2023.01.191
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