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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (1): 50-63.doi: 10.11872/j.issn.1005-2518.2023.01.191

• Mineral Exploration and Resource Evaluation • Previous Articles     Next Articles

Characteristics of Main Orebody of Jiagantan Gold Deposit and Comparative Analysis with Regional Typical Gold Deposit in Gannan Area

Yaoyu CHEN(),Xinghua YAO,Xiangsheng TIAN,Lanjun FENG   

  1. The Third Institute of Geology and Mineral Exploration，Gansu Provincial Bureau of Geology and Mineral Exploration and Development，Lanzhou 730050，Gansu，China
  • Received:2021-12-08 Revised:2022-05-16 Online:2023-02-28 Published:2023-03-27

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Abstract:

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.

Key words: gold enrichment area, ore-controlling factors, characteristics of main orebody, typical deposits, deep prospecting, Jiagantan gold deposit, Gannan area

CLC Number: 

  • P618.51

Fig.1

Regional distribution diagram of large and medium-sized gold deposits in Gannan area（modified after Chen，2020）"

Fig.2

Geological sketch map of Jiagantan gold deposit in Xiahe County"

Fig.3

Distribution diagram of thick and large orebody in the joint middle section of Jiagantan gold deposit"

Fig.4

Joint section diagram of orebody distribution in exploration line 7~36 of Jiagantan gold deposit"

Table 1

Characteristics of main orebodies in Jiagantan gold deposit"

矿体编号延长/m控制最大延深/m平均厚度/m平均品位/（×10-6）厚度变化系数/%品位变化系数/%金资源量/t资源量占比/%
Au4-26201555.113.17130.0749.693.33.75
Au6-35602035.512.59156.99112.901.82.04
Au12-16201833.793.28119.5355.012.52.84
Au14-25401404.142.4793.2047.252.02.27
Au15-16101814.162.7987.4842.322.02.27
Au16-36803506.542.94205.2456.848.59.65
Au18-36202204.872.0697.3754.353.64.09
Au24-55402004.382.53101.6445.833.03.41
Au26-47402154.302.44121.8941.023.33.75
Au29-28602075.022.50100.7037.984.34.88
Au31-57102945.612.94104.0544.916.87.72
Au331 4802875.982.7797.5649.2412.714.42
Au38-86202266.842.1096.3635.364.34.88
Au40-25902183.542.8366.8638.482.73.06
Au42-46802907.512.89120.6445.0110.612.03
Au45-366023813.002.7091.8938.0711.513.05
Au51-557014110.032.9497.4632.385.25.90
合计88.157.27
平均值6882205.902.70111.1148.633.33.75

Fig.5

Contour map of thickness（a） and average grade（b） of Au33 single engineering orebody in Jiagantan gold deposit"

Fig.6

Contour map of thickness（a） and average grade（b） of Au42-4 single engineering orebody in Jiagantan gold deposit"

Fig.7

Contour map of metal content of Au33（a） and Au42-4（b） orebodies in Jiagantan gold deposit"

Table 2

Statistics of thick and large orebodies and main orebodies of each exploration lines in Jiagantan gold deposit"

勘查线编号分布厚大矿体的工程数量/个厚大矿体在勘查线上分布的数量/个

分布主矿体数

/个

勘查线编号分布厚大矿体的工程数量/个厚大矿体在勘查线上分布的数量/个

分布主矿体数

/个

115541413105
766216875
53321814106
396320765
02212422642
144224431
474326541
622228871
832232642
1044236432
12984平均值375

Fig.8

Distribution curves of thick and large orebodies and main orebodies in each exploration lines and exploration project of Jiagantan gold deposit"

Table 3

Comparison of ore-controlling factors of typical gold deposits in Xiahe-Hezuo and Zhongqu-Dashui gold enrichment area"

控矿因素夏河—合作金矿富集区忠曲—大水金矿富集区
加甘滩金矿早子沟金矿以地南金矿大水金矿辛曲金矿
大地构造背景秦岭构造带西段桑科南—格里那断裂带秦岭造山带西段夏河—合作断裂带秦岭造山带西段力士山—新堡复背斜之日加—上郎岗向斜南西翼秦岭造山带西段南亚带、西倾山隆起带南缘、大水弧形构造西翼大水弧形构造西翼中段、忠曲背斜南翼

赋矿地层及

主要岩性

下三叠统隆务河组碎屑岩建造；长石石英变砂岩、粉砂质板岩中三叠统古浪堤组下段细碎屑岩建造；硅质板岩、泥质板岩及粉砂质板岩下二叠统大关山群上部岩组细碎屑岩建造；含炭板岩、泥质板岩

中三叠统马热松多组碳酸盐岩建造；微晶（细晶）

灰岩

下二叠统大关山组海相—海陆交互相碎屑岩—碳酸盐岩建造；微晶灰岩、生物碎屑灰岩
控（容）矿断裂NW向赋矿断裂带长度约为2 000 m、宽度约为500 m，控制矿带及雁行状密集分布的矿体群以NE向张扭性断裂组为主，断裂带长度为1 160 m、宽度为540~580 m，断层长度为1 000~2 200 m、宽度为2~20 m近SN向断裂组赋矿，断裂带长度约为1 000 m、宽度约为300 m，断层长度为数百米至1 000 m、宽度为1~15 mNWW向环状和近SN向放射状断裂组，NWW向断裂带长度约为2 000 m、宽度约为300 m，主矿体赋矿断裂宽度可达100~150 mNNE向控矿破碎带，长度约为230 m、宽度为20~80 m
岩浆岩岩脉不发育，在矿带南部见花岗闪长岩脉（黑云母）石英闪长玢岩脉（枝）非常发育，此类中性脉岩与碎屑岩的接触破碎带一并赋矿矿区中部大面积分布石英闪长岩体，岩体中侵入有闪长玢岩脉和石英—方解石脉且局部具金矿化花岗闪长（斑）岩脉与灰岩破碎带一并矿化，晚期闪长玢岩脉无矿化断裂带内发育方解石大脉、见较富金矿化的闪长岩脉
资料来源田向盛等（2016b，2016c）陈耀宇等（2012）；代文军等（2012a）；金鼎国等（2015）；陈耀宇等（2016）陈明辉等（2016，2017）王平安等（1998）；殷先明（2009）；李文军等（2010）；代文军（2012b）；陈耀宇等（2016）；李鸿睿等（2019）郭林业等（2010）；陈耀宇等（2019）

Table 4

Comparison of main orebody characteristics of typical deposits in Xiahe-Hezuo and Zhongqu-Dashui gold enrichment areas"

主矿体特征夏河—合作金矿富集区忠曲—大水金矿富集区
加甘滩金矿早子沟金矿以地南金矿大水金矿辛曲金矿
矿床规模特大型特大型大型特大型中型
勘查程度详查，首采地段达勘探详查，北东向主采地段达勘探勘探详查，探采集中地段达勘探详查
勘查类型Ⅱ（中等）ⅡⅡⅡ—Ⅲ（中等—复杂）Ⅲ（复杂）
基本工程间距80 m×80 m80 m×80 m80 m×80 m40~80 m×40~80 m40 m×40 m
矿带规模NW向矿带长度1 400 m，宽度300~500 m，斜深200~350 mNE向主矿带长度800~1 300 m，宽度540~580 m，斜深400~1 000 m矿带长度1 600 m，最大垂深1 200 m矿带长度2 500 m、宽度 600 m，斜深大于400 m矿带长度约250 m、斜深260 m
矿体数量333个252个32个253个8个
主矿体数量17个18个2个5个2个
主矿体数量占矿区矿体数5.11%7.14%6.25%1.98%25.0%
代表性主矿体Au33、Au45-3、Au31-5、Au42-4、Au16-3Au1、Au9、Au46、Au45、M6、M4-1、Au30Au4-1、Au3-1Au2、Au7、Au20-1、Au20-2、Au111Au7、Au8
主矿体规模长度为530~1 480 m，斜深200~350 m，属于中—大型，厚度大、品位较低长度为430~1 240 m，斜深358~1 228 m，属于中—大型，厚度和品位中等长度约为1 600 m，斜深470~1 200 m，属于大型，厚度和品位中等长度为280~322 m，斜深270~506 m，属于中型，厚度大且品位富长度为155~224 m，斜深250~260 m，属于中型，厚度大且品位富
矿体形态脉状、不规则脉状脉状、断续脉状不规则脉状不规则脉状、枝杈状、透镜状等透镜状、条带状
矿体产状走向NW，倾向220°~245°，倾角38°~45°NE向主矿带矿体整体倾向SE，上部倾向NW， 倾角为80°~85°

走向5°~10°，倾向E，倾角为85°~90°或

76°~81°

西段的Au2、Au7、Au111走向NW，东段的Au20-1、Au20-

2走向近SN，倾角为45°~90°

走向30°~40°，倾向305°或205°，倾角

约为57°

主矿体平均金品位2.70×10-63.42×10-63.29×10-6~3.37×10-69.93×10-65.28×10-6~7.51×10-6
矿床平均金品位2.84×10-63.16×10-63.33×10-68.77×10-66.89×10-6
主矿体资源量占矿区查明资源量57.27%79.36%75.34%75.36%79.37%

单个主矿体资

源量

2.0~11.2 t（Au33）1.6~30.6 t（Au1），一般为1.6~9.0 t5.5~14.9 t（Au4-1）7.7~23.9 t（Au2）2.0~2.6 t（Au7）

主矿体资源量

规模

5个中型1个大型、6个中型2个大型1个大型、4个中型2个小型
单个主矿体资源量在矿区占比

1.50%~8.28%，

平均为6.52%

1.09%~21.39%，

平均为9.92%

20.39%~54.95%，

平均为37.67%

8.46%~26.23%，

平均为15.12%

34.79%~44.58%，

平均为39.69%

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史振坤等（2012）；

陈耀宇等（2019）

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