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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (5): 570-585.doi: 10.11872/j.issn.1005-2518.2018.05.570

   

Geological Characteristics and Primary Palo Geochemical Prospecting Prediction of the 460 Gold Deposit in Subei County,Gansu Province

Weiguang HUI(),Mingxuan LEI(),Yuanpeng XIA,Xiaobin ZHANG,Qing SUN,Xusheng DUAN   

  1. 1 Sixth Geological Team of Shaanxi Geology and Mining Group Co.,Ltd.,Lintong 710611,Shaanxi, China
  • Received:2018-06-06 Revised:2018-08-28 Online:2018-10-20 Published:2018-10-31

Abstract:

The 460 gold deposit is located in the Mazhongshan area of Subei County,Jiuquan City,Gansu Province,and its geotectonic position is located in the Huangshan-Hongshishan-Lujing Late Paleozoic intracontinental rift zone of the Xingxingxia-Hanshan microplate,Kazakhstan Plate.The gold mineralization in the region is jointly controlled by tectonic,magmatic rocks,stratigraphy and metamorphism.460 gold deposit is a multi-phase medium-low temperature hydrothermal deposit,the origin of hydrothermal and ore-forming materials mainly come from atmospheric precipitation and ore-bearing wall rocks,mineralogenetic epoch is middle and late variscan,with a large number of gold veins and more than 110 large veins.10 representative gold veins were selected on the basis of previous data and indoor comprehensive research.The metallogenic regularity of gold deposits was summarized,and a prediction model of geochemical primary halo was established by field observation,isotopic geochemistry,inclusions test and primary halo rock geochemical survey.The predicted results show that there may be 21 blind orebodies in the depth of 10 gold veins,the drilling proved that the mine was good.

Key words: mineral forecast, prediction model, structural superimposed, zonation of primary halos, metallo-genic regularity, geological characteristics, 460 gold deposit, Gansu Province

CLC Number: 

  • P618.51

Fig.1

Outline map of regional geology in the 460 gold mine area(modified according to references[9]、[21]) "

Fig.2

Geological map of 460 gold mining area(modified according to Li,et al [ 11 ] ) "

Fig.3

Gold veins controlled by a fault zone"

Fig.4

Ore-bearing quartz veins composed of multi-phase quartz single veins "

Table 1

Test results of sulfur isotope"

样品

编号

取样对象 测试矿物 测试结果
δ 34 S‰ σ
平均 -4.309
ST01 一期石英脉 黄铁矿 -4.995 0.010
ST02 二期石英脉 黄铁矿 -4.813 0.011
ST03 三期石英脉 黄铁矿 -3.416 0.009
ST04 四期石英脉 黄铁矿 -4.418 0.015
ST05 含矿石英脉 黄铁矿 -4.611 0.011
ST06 褐铁矿化石英脉 黄铁矿 -3.600 0.009

Table 2

Test results of pulse quartz inclusion temperature"

样号 序列号

冰点温度

/℃

均一温度

/℃

取样对象

(标高)

包裹体特征 气相/% 液相/%
CO 2 CH 4 N 2 H 2 CO 2 H 2 O
BG01 1 -4.2 312.5

一期石英脉

(1 274 m)

包裹体较密集,间距10~20 μm,形态较规则,大小3~5 μm。由气、液相组成,气泡大小为1 μm 22.7 - 77.3 - - 100.0
2 -4.1 312.3
3 -3.7 309.2
BG09 1 -1.6 220.1

二期石英脉

(1 340 m)

包裹体明显呈疏密不等的条带状排列,形态不甚规则,大小为2~4 μm,边界模糊,气泡圆形。分为气液相,气相成分较多 80.2 2.0 15.6 2.2 0.13 99.87
2 -1.5 220.0
3 -0.8 219.1
4 -0.8 213.7
5 -0.5 212.3
BG03 1 -3.2 188.5

二期石英脉

(1 274 m)

包裹体较规则,大小为3~5 μm,由气、液两相组成 - - 85.9 14.1 - 100.0
2 -3.1 188.4
3 -2.7 187.0
BG02 1 -2.8 135.5

三期石英脉

(1 274 m)

包裹体形态较规则,大小为3~5 μm 10.0 6.2 83.8 - 0.04 99.6
2 -2.7 135.4
3 -2.4 130.1
4 -2.2 130.1

Fig.5

Fluid inclusion petrography feature pattern"

Fig.6

Laser Raman atlas of fluid inclusion"

Table 3

Lower limit of element abnormity of each vein"

金矿脉编号 异常下限
Au Ag Co Ni Cu Zn Mo W Pb Bi As Sb Hg
A106 150 200 10 9 80 44 4 1 6 0.3 1.5 0.2 18
A112 56 105 7.7 6 26 38 1.5 1 5 0.18 0.7 0.2 10
B204 200 250 13 17 30 42 2.1 0.8 4.5 0.17 1.1 0.14 40
B211 50 90 15 16 27 48 1.2 0.7 4.4 0.1 1.3 0.18 9
B250 150 150 17 18 35 43 0.6 0.4 3.3 0.2 1.2 0.1 14
D330 48 110 10 17 38 32 1 0.7 5 0.15 2 0.3 20
D335 110 250 16 35 70 90 2.5 2.5 22 0.5 5 2 40
D348 35 110 16 30 50 80 1.56 2.93 20 0.48 2.1 0.34 20
Q5 310 580 16 32 145 71 6 2.5 15 0.5 3.5 1.4 59
Q8 34 580 12 15 120 46 6 1.6 6 0.1 2.5 1 60

Fig.7

Variation of B39 profile element content and Au line metal content with depth in B204 gold vein "

Fig.8

Primary halo anomaly pattern of single mineralization period in the mining area "

Fig.9

Primary halo prediction model for 16-line profile of B211 vein "

Fig.10

Vertical longitudinal projection for predicted ore bodies by primary halo of gold vein "

Table 4

List of gold ore body prediction results"

金矿脉编号 预测矿体号 金矿脉编号 预测矿体号
B204 B204-1 B211 B211-1
Q5 Q5-1 B211-2
D330 D330-1 D335 D335-1
D330-2 A112 A112-1
Q8 Q8-1 A112-2
Q8-2 A112-3
Q8-3 A106 A106-1
D348 D348-1 A106-2
D348-2 B250 B250-1
D348-3 B250-2
D348-4 共21条盲矿体
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