Potential Resource Evaluation and Treatment Suggestions of Gold Tailings （Slag） in Southwest Guizhou
Received date: 2021-09-29
Revised date: 2022-02-21
Online published: 2022-09-14
With the rapid development of gold mining technology in China，the number，scale and output of gold mines are increasing day by day，but the ore grade is constantly decreasing.At the same time，with the increase of mining intensity of gold mines，the number of tailings produced also increases dramatically.However，gold tailings are valuable secondary resources with fine particle size，large resource quantity，low price and no need for mining，crushing and grinding operations，which has a high possibility of comprehensive utilization.With the improvement of ore dressing technology and the shortage of gold resources，the gold tailings has a higher recovery value.Southwest Guizhou is one of the main production areas of carlin-type gold deposits in China，which has been mined for several decades.With the mining of gold deposits，a large number of tailing resources have been produced.The gold deposits in southwest Guizhou are mainly accumulated in Zhenfeng-Qinglong-Anlong area.The gold content and occurrence state of five typical gold tailings reservoirs in this area were investigated，and the total amount of gold in the area was estimated by using the geological block method.The results show that most of the gold in the tailings is in the state of gold wrapped in quartz in the fine pyrite，and the potential pile stock of Lannigou carbon leaching gold mine tailings is about 1.2 million tons，the content of Au in the carbon leaching tailings is as high as 2.52×10-6~3.82×10-6，with an average of 3.13×10-6，far higher than the industrial grade of primary gold deposit，the estimated amount of gold metal is 3.75 t.The potential resource of the tailings （slag） of Shuiyindong gold mine is about 4.2 million tons，the gold content is 1.67×10-6，and the estimated Au metal content is 7.01 t.Both of these two tailings resource have the potential of secondary gold extraction.The soil，plants and water quality around the two tailings reservoirs of Zima and Laowanchang were analyzed.It is found that Cd，Hg and As in the samples exceeded the standard seriously，which is harmful to the environment.Therefore，the disposal of gold tailings has become the primary problem to protect the local environment.For these gold tailings that do not reach the industrial grade，they can generally be used in reclamation planting，mining filling or processing into building materials.At present，it has been studied by many scholars at home and abroad，and its application prospect is very broad.
Baichuan SUN , Ruidong YANG , Lulin ZHENG , Jun CHEN , Haili REN , Junbo GAO , Wei CHENG . Potential Resource Evaluation and Treatment Suggestions of Gold Tailings （Slag） in Southwest Guizhou[J]. Gold Science and Technology, 2022 , 30(3) : 470 -482 . DOI: 10.11872/j.issn.1005-2518.2022.03.140
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