浅钻地球化学测量在甘肃北山南金山金矿外围浅覆盖区的应用

doi:10.11720/wtyht.2023.1192

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Abstract

The Nanjinshan gold deposit is a typical epithermal deposit in Beishan metallogenic belt, which extends in a N-E direction to the peripheral shallow cover zone. In order to further achieve the breakthrough of prospecting in the peripheral shallow overburden area, the pilot work of motorized shallow drilling geochemical survey carried out. Based on the nature and thickness of the overburden, 126 motorized shallow drilling geochemical exploration samples are taken in the shallow overburden area using the vehicle mounted air positive circulation and three wing alloy scraper drilling or pneumatic DTH hammer drilling technology, with a sampling density of 16.8 points per square kilometer. The shallow drilling geochemical exploration methods and technologies in the shallow overburden area are further discussed, including the selection of drilling technology, sampling network, sampling materials, sample collection, etc. Soil survey was carried out in sporadic bedrock areas, and 278 samples were collected, and the sampling density was 48.77 points per square kilometer. Fifteen elements including Au, Ag, as, Sb, Hg, Cu, Pb, Zn, W, Sn, Mo, Bi, Cr, Co and Ni were analyzed. Through the above work, seven comprehensive geochemical anomalies were delineated. After anomaly investigation, six gold deposit bodies and one silver deposit body were found in the new circle in the bedrock area, and two concealed gold deposits and one silver deposit body were found in the shallow overburden area. The results show that shallow drilling geochemical survey is effective and feasible in the shallow overburden area of arid Gobi landscape in Beishan.

Key words： shallow drilling geochemical survey shallow overburden area Nanjinshan gold mine Beishan, Gansu

Received: 15 April 2022 Published: 27 April 2023

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	Zhen-Hong WEI
	Ji-Chang ZHAO
	Zheng-Gang QU
	Xin-Xiang FAN
	Sheng-Ye LI
	Hai-Yun CHEN
	Yong-Biao LIU
	Zhen-Xi YANG

Cite this article:

Zhen-Hong WEI,Ji-Chang ZHAO,Zheng-Gang QU, et al. Application of shallow drilling geochemical survey to shallow overburden area at the peripheral of Nanjinshan gold mine in Beishan, Gansu Province[J]. Geophysical and Geochemical Exploration, 2023, 47(2): 331-342.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1192 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I2/331

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1—Quaternary Holocene alluvium; 2—Quaternary Pleistocene alluvial diluvium; 3—Neogene Kuquan formation; 4—Carboniferous Baishan formation; 5—middle Carboniferous monzogranite; 6—middle Carboniferous quartz diorite; 7—diorite vein; 8—quartz vein; 9—fault of unknown nature; 10—strike-slip fault; 11—location of medium-sized gold deposit; 12—location of gold mine; 13—location of copper polymetallic deposit; 14—location of pyrophyllite deposit; 15—stratum occurrence; 16—study area
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Geological and mineral map of the periphery of Nanjinshan gold mine (revised according to 1:50,000 Yemadaquan map^[22])
1—Quaternary Holocene alluvium; 2—Quaternary Pleistocene alluvial diluvium; 3—Neogene Kuquan formation; 4—Carboniferous Baishan formation; 5—middle Carboniferous monzogranite; 6—middle Carboniferous quartz diorite; 7—diorite vein; 8—quartz vein; 9—fault of unknown nature; 10—strike-slip fault; 11—location of medium-sized gold deposit; 12—location of gold mine; 13—location of copper polymetallic deposit; 14—location of pyrophyllite deposit; 15—stratum occurrence; 16—study area

Comprehensive histogram of overburden structure unit layer (a), contour map of overburden thickness(b) and schematic diagram of overburden deposition (c) in the study area

Photos of landform and landscape of shallow overburden area in the study area (a) and on-site construction photos of motorized shallow drilling (b)

参数		Cr	Co	Ni	Cu	Zn	Mo	W	Pb	Bi	As	Sb	Sn	Ag	Hg	Au
算术平均值	$X ˉ 1$	72.0	8.3	26.6	31.1	96.7	2.42	3.15	22.8	0.27	70.8	4.37	1.1	66.528	35	5.5
算术平均值	$X ˉ 2$	62.8	6.9	24.4	20.4	69.2	1.91	2.48	23.4	0.28	62.5	5.37	1.4	71.539	55	5
校正系数	k₁	0.87	0.83	0.92	0.66	0.72	0.79	0.79	1.03	1.04	0.88	1.23	1.27	1.08	1.57	0.91
校正系数	k₂	1.15	1.20	1.09	1.52	1.40	1.27	1.27	0.97	0.96	1.13	0.81	0.79	0.93	0.64	1.10

Arithmetic mean value and correction coefficient after iterative elimination

元素	地球化学场(n=384)				地球化学背景场				D	北山地区背景值^[31]
元素	$X ˉ$	S	C_v	K_k	$X ˉ 0$	S₀	C_v0	K_k0	D	北山地区背景值^[31]
Cr	73.40	87.70	1.19	1.63	66.00	22.30	0.50	1.47	4.37	44.94
Co	8.30	9.80	1.18	0.88	7.40	3.30	0.35	0.78	3.33	9.43
Ni	29.10	30.90	1.06	1.24	25.30	12.10	0.52	1.08	2.94	23.38
Cu	29.20	42.50	1.46	1.72	24.40	13.40	0.79	1.44	3.80	17.00
Zn	93.30	79.40	0.85	2.21	78.50	34.10	0.81	1.86	2.77	42.30
Mo	2.76	2.98	1.08	3.58	1.86	1.13	1.47	2.42	3.91	0.77
W	4.29	6.85	1.60	4.77	2.61	1.16	1.29	2.90	9.71	0.90
Pb	34.90	87.60	2.51	2.53	23.50	10.50	0.76	1.70	12.39	13.80
Bi	0.43	0.72	1.67	0.62	0.27	0.12	0.17	0.39	9.56	0.69
As	122.10	185.60	1.52	33.73	66.20	69.10	19.09	18.29	4.95	3.62
Sb	8.02	9.98	1.24	19.56	5.03	4.50	10.98	12.27	3.54	0.41
Sn	1.40	0.70	0.50	0.76	1.30	0.30	0.16	0.70	2.51	1.85
Ag	286.91	764.48	2.66	5.58	69.69	21.32	0.41	1.36	147.62	51.40
Hg	52.00	35.00	0.67	3.05	49.00	29.00	1.70	2.88	1.28	17.03
Au	22.90	88.20	3.85	18.62	4.90	3.80	3.09	3.98	108.47	1.23

Statistical table of geochemical parameters in the study area

Element cluster analysis pedigree chart

Component matrix after factor rotation

Geological sketch map (a), Au geochemical anomaly distribution (b) and Ag geochemical anomaly distribution (c) of the study area
1—Holocene; 2—Pleistocene; 3—Neogene; 4—Carboniferous Baishan formation; 5—middle Carboniferous monzogranite; 6—middle Carboniferous quartz diorite; 7—middle Carboniferous diorite; 8—secondary quartzite; 9—fault of unknown nature; 10—strike-slip fault;11—normal fault; 12—reverse fault; 13—motor-driven shallow drilling position; 14—soil survey points; 15—drilling of ore in construction; 16—high value point of element; 17—position of shallow drilling section; 18—comprehensive abnormality and number; 19—geochemical survey range; 20—concentrator location; 21—gold mineralization zone; 22—gold-silver mineralized zone

Sampling plan of Au1~Au3 orebody (a) and Au4~Au6 orebody (b) in bedrock area
1—tuffaceous conglomerate; 2—pebbly tuffaceous sandstone; 3—sedimentary tuff; 4—siliceous limestone; 5—dacite tuff; 6—secondary quartz vein; 7—diorite vein; 8—Au ore body and number; 9—Ag ore body and number; 10—measured fault with unknown nature; 11—measured reverse fault; 12—stratum occurrence; 13—location and number of exploration line; 14—location and number of borehole in the mine; 15—completed exploratory trench and its number; 16—thickness of ore body (m) / average grade of gold (g/t) average grade of silver (g/t)

Section diagram of apparent polarizability (a), section diagram of apparent resistivity (b), element curve (c) and geological section (d) of 96 exploration line in the study area
1—Quaternary alluvial sand gravel; 2—conglomerate; 3—silty mudstone; 4—pebbly silty mudstone; 5—breccia bearing dacite tuff; 6—tuffaceous slate; 7—limonitized breccia bearing tuffaceous slate; 8—sericite mother slate; 9—carbonaceous sericite mother slate; 10—pyritized carbonaceous sericite mother rock; 11—secondary quartzite; 12—gold orebody; 13—inferred fault boundary; 14—position and number of completed motorized shallow drilling; 15—location and number of completed boreholes; 16—thickness of ore body (m) / average grade of gold (g/t); 17—water table

33]
Au—natural gold;Py—pyrite;Cpy—chalcopyrite;Qz—quartz
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Photo of ore in ZK9601 borehole at the periphery of Nanjinshan (a) and photo of Nanjinshan gold ore under microscope (b)^[33]
Au—natural gold;Py—pyrite;Cpy—chalcopyrite;Qz—quartz

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