Wangqingfu-Duhuangling area is located in the north of Wufeng-Xiaoxinancha uplift belt, the east extension of Yinshan-Tianshan complex structural belt, and the southeast edge of Hedgehog-Jincang Mesozoic inherited volcanic dustpan faulted basin. The Yanshanian tectonic magmatism was intense and frequent in the area, forming a large area of late Jurassic intermediate-acid volcanic rocks and subvolcanic rocks, which distributed in the east and west. They are closely related to gold mineralization. The main exposed strata are Jingouling Formation and Kaishantun Formation, and the structure is mainly east-west Fuxing-Duhuangling fault. The main mineral is gold, and Jiusangouyan gold deposit and Jincanggu placer gold deposit have been mined.

The geotectonics in this area is located at the eastern edge of Yanji terrane. This area is covered by widely developed early Yanshanian rock mass, and the exposed area of strata is small. There are small areas of glutenite, conglomerate and slate exposed in the north of the work area. The upper Jurassic Jingouling Formation of Mesozoic is exposed in the south of the mining area, and its lithology is purplish gray-black-black green compact andesite agglomerate, andesite breccia, neutral vitrinite-microcrystalline tuff, andesite mixed with tuff sandstone, and the bottom is andesite tuff conglomerate, but this layer is also covered by Tumenzi Formation of Tertiary.

The structure in the area is mainly east-west, with four groups of secondary structures in northeast, northeast, northeast and northwest directions. The mineralization in this area is mainly controlled by the east-west main structural belt, where all gold-bearing bodies exist, and the secondary structure is not closely related to mineralization.

The working area is covered by large-area exposed early Yanshanian rock mass. Lithological composition includes granodiorite, granite porphyry, quartz diorite, granite and so on. Andesite and diorite porphyry dikes are interspersed among them.

Most of the gold mineralization bodies in Duhuangling mining area occur in sulfide veinlets such as pyritization, limonitization and silicification in the fractured alteration zone, and the surrounding rocks are granodiorite or quartz diorite. Influenced by metal sulfide, there is obvious electrical difference between mineralized body and surrounding rock. There are obvious differences in electrical properties between mineralized geological bodies and surrounding rocks in this area, and high polarization points all appear in mineralized alteration zones. The average polarizability in this area is 1.5%, the common value is 0.5% ~ 2.9%, and the maximum polarizability is 2.95%.

Duhuangling mining area belongs to the northeast humid-semi-humid temperate forest landscape belt, and the climate belongs to humid-humid cold-mild continental monsoon climate. The zonal soil is gray-brown soil, as well as mountain albic soil and meadow soil. The soil is developed, the vegetation cover is thick, the hillside is mainly residual slope deposits, and the water system in the area is dendritic.

On the geological map of1:50,000, a large area of east-west distribution of1:200,000 gold anomalies can be seen in fuxing town-Duhuangling, among which there are many1:50,000 geochemical gold anomalies, and their distribution positions are in good agreement with east-west faults, rock masses and ore occurrences.

Ore (mineralized) bodies are mainly distributed in granodiorite in the middle of the mining area, controlled by the alteration zone distributed in 75 direction, with the alteration width of 680m and the length of1140m. Silicification, chloritization, pyrite, kaolin, sericitization and carbonation are widely developed in the alteration zone. At present, there are 19 ore-bearing (mineralized) geological bodies delineated by * * *, and the overall distribution characteristics are consistent with and nearly parallel to the alteration zone. The ore body is relatively continuous and stable on the surface, and the thickness of the ore body changes greatly, with only local structural fractures passing through. There are 19 gold bodies in the near east-west alteration zone, and the control length is160 ~165,438+040m. The ore type is altered rock type, which is brown iron and chalcopyrite sericite altered rock, containing pyrite veinlets, and the highest grade of a single sample is 158.00×. Metal mineralization includes pyritization, chalcopyrite mineralization and limonite mineralization. The surrounding rocks of mineralized bodies are granodiorite and granodiorite porphyry. Wall rock alteration is very developed, mainly including star pyritization, sericitization, kaolinization, silicification, carbonization, chloritization and epidotization.

In 2004, the prediction and evaluation of deep geochemical prospecting was carried out in the east-west survey area of Jingou, which is outside the Duhuangling mining area. According to the preliminary work and the distribution range of geochemical gold anomalies, nine survey lines (3, 7, 1 1, 15, 6544) were arranged in the west survey area of Jingou.

(2) Plane features of gold anomaly extraction by geoelectric method from Line 3 to Line 35 in Jingou West Area.

After digital processing, the geoelectric data extracted at 3 ~ 35 degrees in the west sea area of Jingou are selected as the outer gathering area, 2×10-9 ~ 4×10-9 ~ 4×10-9 ~ 4. JWD 1, JWD2, JWD3 and JWD4 (see figure 8-2 1 west).

JWD 1 Anomaly Features This anomaly is located between No.80 and No.95 of Jingou West Survey Area 19 ~ 27 Line. The abnormal distribution is irregular, the three-level concentration zoning is complete, and the internal concentration zone is clearly developed. At 83 o'clock and 9 1 point in the 23rd line, 10.7 1× 65438 is measured.

The characteristic anomalies of JWD2 are located between Line 23 and Line 3 1 Line 60 and Line 75 in Jingou West Survey Area, with irregular distribution and no obvious zoning of the third-level concentration. Only at 66 points on Line 23, 67 points on Line 27 and 73 points on Line 3 1, there are three slightly higher Au contents, and the Au anomaly values are 4.08× 65438 respectively.

Characteristics of JWD3 anomaly This anomaly is distributed in a star shape from Line 7, Line 60 to Line 65 to 15 in the west survey area of Jingou, and the zoning of tertiary concentration is incomplete. Only at 65 points on the line 1 10-9, a single Au abnormal high point was measured.

Characteristics of JWD4 anomaly This anomaly is distributed in a star shape between No.80 and No.90 of Line 3-7 in Jingou West Survey Area, and the zoning of the third-level concentration is incomplete. Only at 84 points on Line 3, the single Au anomaly value is 9.46× 10-9.

(3) Plane features of geoelectric gold extraction anomalies in line 63 ~ 87 in Jingou West Area.

After digital processing, 2× 10-9 ~ 4× 10-9 is the external concentration region, and jed24×10-9 ~ 8×10-9 is the medium concentration region.

Fig. 8-2 1 abnormal profile of geoelectric gold extraction in jingou survey area of Duhuangling gold mining area, Wangqing County, Jilin Province

Characteristics of JED 1 anomaly The anomaly is pistol-shaped from 80 o'clock to 100 o'clock on the 79-87 line east of Jingou, and the third-level concentration zoning is complete, and the internal concentration zone is mainly concentrated at 88-92 points on the 79 line. Five high-value anomalies greater than 10× 10-9 were continuously measured at 80-92 points on this line.

The characteristics of JED2 anomalies are irregularly distributed between 60 and 75 points on the 83-87 line east of Jingou, and the zoning of tertiary concentration is relatively complete. The inner enrichment zone is mainly concentrated at 70 ~ 72 points along the 83rd line, and the gold content at 72 points is as high as 20× 10-9.

The abnormal characteristics of JED3 are irregularly distributed between 55 and 70 points on the 63-67 line in Jingou East Area, and the third-level concentration zoning is relatively complete. The inner enrichment zone is mainly concentrated at 64 points on the 67th line, and the Au content is as high as 1 1× 10-9.