Geological survey of 1. deposit
The working area is located at the northern edge of the middle section of Nanling east-west structural belt, where it meets the middle section and the south section of Leiyang-Linwu north-south structural belt. Among them, Hehuaping area is located in the middle of Wugaishan-Qiaokou uplift belt, where Qianlishan and Wang Xianling "twin" compound rock mass meet. Xianghualing area is located in the south of Xianghualing anticline in the southwest of Qitianling rock mass and in the north of Tongtianmiao dome structure.
(1) Hehuaping District
The exposed strata in the mining area mainly include middle-upper Devonian, lower Carboniferous and Quaternary residual.
The mining area is located in the west wing of the northern end of Wugaishan inversion anticline, and the structural composite parts of NE and NNE.
The faults in the mining area are mainly NE-NE faults, which are closely related to mineralization and are ore-guiding and ore-hosting structures.
Fold structures are developed in this area, mainly in the Hehuaping compound syncline, with the middle Devonian Qiziqiao Formation as the core and the middle Devonian Inter-strip Formation as the wings. The secondary closed folds in the south of the mining area develop in NE-NNE direction, some folds are reversed, and the sliding collapse space between fold structures is a favorable place for ore hosting.
Magmatic activity is frequent in the mining area. The exposed granite is a part of Wang Xianling rock mass, which is distributed in the northwest of the mining area, and there are late granite veins and porphyry veins in the southeast and south of the mining area. Magma has the characteristics of multi-stage activity. The main invasion time of Qianli Mountain and Wang Xianling is 182 ~ 198 Ma, the second invasion time is 158 ~ 162 Ma, the third invasion time is 132 ~ 138 Ma, and the fourth invasion time is138 ma. Every stage of activity is accompanied by alteration and mineralization, especially in the later stage, some dikes are ore bodies. According to the occurrence and interpenetration of dikes, they can be divided into two groups: one group is distributed in groups along the NNE fault structure belt, mainly granite porphyry dikes, followed by granite dikes, which are controlled by the NNE fault structure and strike 20 ~ 45 NE, and are often cut by the NNE group dikes along the strike, striking hundreds of meters to thousands of meters. The dike and its two sides are usually characterized by greisenization, silicification and chloritization, accompanied by mineralization of tin, lead and zinc. The invasion time is 90 ~ 1 18ma, which belongs to the fourth invasion. The other group is mainly distributed in the south of the mining area, mainly composed of granite porphyry veins, which occur in veins and groups, with a strike of 70 ~ 85 and a strike of several hundred meters to several thousand meters. Marble grain, iron manganese carbonization, etc. , accompanied by pyrite and lead-zinc mineralization, common beside dikes. Judging from the dike passing through the NNE-BDE formation, the dike intrusion period of this group is slightly later than that of the NNE-BDE formation, and it belongs to the fourth to fifth intrusions.
The wall rock alteration in this area is mainly silicification, skarnization, sericitization, marble and chloritization. It is characterized by strong alteration and various alteration types.
There are many mineralization points in the working area, which can be divided into two types of tin ore bodies controlled by fault structure (and its porphyry) and horizon according to ore-controlling factors.
1) Tin and lead-zinc ore bodies are controlled by horizons. ① No.Ⅳ ore body: layered skarn-cassiterite sulfide tin ore body in transition layer, distributed between the upper wall of ore-controlling fault F 104 and the lower wall of F 106, and controlled by the transition layer of impure limestone in the lower member of Qiziqiao Formation of Middle Devonian and sandstone in Tiaozhi Formation. The strike is generally controlled at 4000 meters, and the maximum dip angle extends to 680 meters. The ore body is layered-layered, and the occurrence is consistent with the surrounding rock, with dip angle of 1 15 ~ 120 and dip angle of 20 ~ 35. The real thickness of the ore body is 0.84 ~14.51m, with an average thickness of 5.49m m. The average tin content of a single project is 0.20% ~ 2.81%,and the average tin content of the ore body is 0.63%. Main metal minerals: cassiterite, galena, sphalerite, bismuthite, chalcopyrite, pyrite, pyrrhotite, etc. Ore structures include disseminated structure, veinlet structure, breccia structure and reticular vein structure. Wall rock alteration mainly includes silicification, skarnization, chloritization, materialization and sericitization. ② Pb-Zn mineralized body: It is distributed in Zhenzhuling-Dakaiwan along F 107, with the exposed length greater than 1.2km and the width greater than 200m ... Mineralized body occurs in argillaceous limestone mixed with dolomitic limestone in the middle of the middle section of Qiziqiao Formation (D2q2), with the occurrence of120 ?. The main metal minerals are galena, sphalerite and pyrite. The highest content is lead 0.67%, zinc 1.3 1%, silver 90.4× 10-6 and tin 0.1%. The main wall rock alterations are pyrophyllite, weak silicification, chloritization and Fe-Mn carbonation.
2) Tin, lead-zinc ore bodies controlled by fault structures or porphyries. ① No.Ⅰ tin polymetallic ore body: tin-based ore body dominated by lead, zinc and bismuth. Located between the gate and the back pond, it is distributed on the 43- 1 1 1. Ore body strike extension1300m, dip extension170m. Controlled by F 10 1 fracture zone, it occurs in fine-grained granite porphyry or marble limestone. The ore bodies are veined and lenticular. General dip 130 ~ 150, dip angle 60 ~ 80, thickness 1.00 ~ 2 1.00 m, average thickness 4.45m, thickness variation coefficient 123%, unstable. The average content of a single ore body is 0.121%~ 2.130%, with an average content of 0.927% and a content variation coefficient of 56%, and the components are evenly distributed. The maximum content of associated lead is 2.9 1%, zinc is 0.76%, and bismuth is 0.36%. Metal minerals mainly include cassiterite, galena, marmatite, scheelite, bismuthite, pyrite and pyrrhotite. The ore type is cassiterite sulfide type. The alteration of surrounding rocks is mainly greisenization, skarnization and amphibolite. ② No.Ⅱ tin polymetallic ore body: distributed between Xijinling-Tianzihao 63-11line, controlled by F 104 and its adjacent granite porphyry contact zone, occurring in carbonate rocks in the lower member of Qiziqiao Formation and sandstone in the upper part of Tiaomajian Formation. The strike of the ore body is 650m long, and the dip angle extends 50m. The ore body is in the form of big vein and lens, with an overall dip angle of 130 ~ 140, a dip angle of 60 ~ 80, a thickness of1.00 ~10.00m and an average thickness of 3./kloc. The average contents of individual ore bodies are Sn 0. 187% ~ 0.959%, Pb 0.48% ~ 9. 10%, Zn 0.43%1%~ 0.70%, and the average contents of ore bodies are Sn 0.67% and Pb/0. Metal minerals mainly include cassiterite, galena, sphalerite, pyrite, chalcopyrite and arsenopyrite. The wall rock alteration is mainly skarnization, greisenization and Fe-Mn carbonation. ③ Ⅲ Sn-Bi polymetallic ore body (group): distributed in Longtan section, controlled by F 104 and its adjacent granite porphyry veins, and hosted by silicified sandstone and altered granite porphyry. Two tin (bismuth) ore bodies have been controlled, and the ore type is cassiterite sulfide type. Among them, Ⅲ-1ore body: distributed between lines 70-56, it is an altered fracture zone type tin ore body, occurring in granite porphyry and lateral fracture zone, with vein and lenticular output. Its occurrence is consistent with the dike, the dip angle is 3 10m30 ~ 135, the dip angle is 62, and the ore body strike is long. The average content of tin in a single ore body is 0. 14 1% ~ 0.777%, the average content of tin in ore body is 0.506%, the grade variation coefficient is 35%, and the composition distribution is relatively uniform. Ⅲ-2 orebody: altered sandstone-type bismuth orebody distributed near Line 48, occurring in sandstone of interbedded formation, with vein-like occurrence, dip angle of 130 ~ 135, dip angle of 60 ~ 70, orebody strike length of 220m, dip extension of100m and thickness of 4.90m..
(2) Xianghualing District
1) stratum. The strata exposed in the mining area are Cambrian, Middle Devonian Tiaojian Formation (D2t), Qiziqiao Formation (D2q), Shangshetianqiao Formation (D3s), Xikuangshan Formation (D3x), Lower Carboniferous Meng Gong 'ao Formation (C 1m) and Shixianzi Formation (C 1sh). Cambrian is a set of flysch formation-like shallow metamorphic rock series, which is exposed in the south of South Jilin Mountain in the middle of the mining area and near the east of the footwall of F 1 fault. Tiaojian Formation is widely exposed on the surface of the mining area, which is a set of clastic rock series of coastal facies and shallow marine facies, and is covered by Cambrian unconformity. Qiziqiao Formation is mainly exposed in the east and west sides of the mining area, mainly distributed around Laiziling rock mass in the east, and is a set of shallow-sea carbonate rock series. Shetianqiao Formation, Xikuangshan Formation, Meng Gong 'ao Formation and Shilianzi Formation are distributed in the west of the mining area, which are a set of carbonate strata with clastic sediments.
2) Ore-controlling structural features. Because this area is located in the north inclined part of Tongtianmiao dome, the lithology exposed on the surface is mostly Devonian interbedded sandstone, and the structure in this area is characterized by fault development, but the folds are not obvious. The whole structure is monoclinic, and only a few small folds are developed on the surface. Monocline structures generally tilt to the north, but the east and west tilt to the northeast and northwest respectively, with an overall dip angle of about 20. The folds in the area are roughly divided into two systems, with Cambrian as the basement to form an axial nearly east-west composite anticline; The caprock is monoclinic structure, with small folds or folds that are near the north-south axis and intersect the main fault at an acute angle, mostly sharp-edged folds. The faults in this area are mainly F 1, F 102 and F 103, and other secondary or derivative faults are developed. The scale of faults varies from ten meters to ten kilometers, and most of them have the characteristics of multi-stage activity. Now they are divided into the following groups according to their nature. The NE-trending fault is the main rock-guiding and ore-controlling structure in this area. The main representatives are F 1, F 102 and F 103, followed by F29, F 19, F7, F8, F9 and F 12. The fault strike of this group is northeast or northeast, inclined to southeast or southeast, and the dip angle is between 36 and 75. The fault scale is the largest in F 1, followed by F 102 and F 103. Most of the faults in this group belong to extensional normal faults, which are pre-metallogenic faults. The fault is filled with tin and tin-lead-zinc ore bodies of different scales (such as F 1) or later dike filling (such as F 12). The formation time of NE-trending faults is later than that of Beidong Formation, mainly represented by F 1 1, F3 1, F80, etc. The NNW fault is small and undeveloped, which has little influence on the structure of the mining area.
3) The relationship between magmatism and mineralization. Magmatic activity is strong in this area. In the areas from Heyechong to Nanjiling, from Shanjiachong to Jiaoxi to Lingbei, there are many granite porphyry veins or timely porphyry veins exposed to the surface. The exposed dam is ten meters to several kilometers long and several meters wide. Tin or lead-zinc mineralization is found on the surface of some granite veins (mainly γ π (Ⅰ)-γ π (ⅵ)). ① Waziling rock mass: Waziling rock mass intrudes along the intersection of F 1 and F2. The surface is an ellipse with the long axis in the northwest direction, and the exposed area is1.88km2. The northeastern edge of the rock mass is in contact with the carbonate rocks in the middle and upper part of Qiziqiao Formation, and the gas-thermal alteration forms beryllium-bearing banded rocks. The southwest margin is in contact with the calcareous sandstone shale of the Tiaozhou Formation, and due to hydrothermal alteration, the contact with the outer belt sandstone shale also forms a simple skarn body. Rock mass has complex lithology and is the product of multiple intrusions. The main body of biotite granite was formed for the first time, the supplement of albite fine-grained porphyry granite was formed for the second time, fine-grained rock, granite porphyry and chronological porphyry dike were formed for the third time, and the interpenetration of greisen dike was formed for the fourth time. Due to the strong autometamorphism, the alteration zoning of greisen or topaz greisen belt → greisenization belt → albitization belt → potash feldspar belt → biotite granite original rock was formed from top to bottom. ② Granite porphyry veins and quartzite veins: There are 9 outcrops in the Heyechong-Nanjiling area, among which 7 granite porphyries are numbered γ π (Ⅰ)-γ π (ⅶ); The other two are quartz porphyry, numbered λ π (ⅷ) and λ π (ⅸ). Among them, γ π (Ⅰ) and γ π (Ⅱ) have a large surface exposure. The exposed length of γ π (Ⅰ) is 850m and the width is 8 ~ 12m. γ π (Ⅱ) exposed length 1700m, width 6 ~ 15m. According to the investigation of human points, there are γ π (Ⅱ) and γ π (Ⅲ)-γ π (ⅶ), λ π (ⅷ) and λ π (ⅸ) in deep integration. This dike has different degrees of greisenization, fluorination and sericitization, and produces pyrite, galena, sphalerite and tin mineralization. Mineralization zoning like F 1, Sn-Sn, Pb, Zn-Pb, Zn-Ag mineralization-no mineralization is formed from bottom to top. In Lingbei-Tangzhatou-Jiaoxi area, the intermittent exposure length of the surface granite porphyry vein is over 7000 m, except for the small exposure scale of the dike in Jiaoxi area, the other exposure widths are 10 ~ 25m, indicating that the scale of the dike-type deposit is huge. In addition to the dike exposed on the surface, it is inferred that there are many granite porphyry dikes with similar properties hidden in the deep part of the mining area. On the one hand, there are large-scale concealed granite strains in this area, on the other hand, the granite porphyry veins invaded in the later period are not limited to a few. ③ Yunying dike: it is the product of the previous stage. Often embedded in granite porphyry veins, thus enhancing the mineralization of granite porphyry veins. This kind of dike is generally small in scale, with the longest dike about 50m long and 1 ~ 2m wide. Cassiterite mineralization can be seen in the dike.
4) Wall rock alteration. The wall rock alteration in this area is mainly silicification, skarnization, keratinization, mica fluoridation, greisenization and chloritization. Among them, skarnization and greisenization are closely related to mineralization.
5) Ore body characteristics. The work area controls skarn tin ore bodies, altered conglomerate tin ore bodies and porphyry vein tin-lead-zinc-silver ore bodies. ① Heyechong skarn tin ore body. It is distributed in the southwest contact zone of Laiziling rock mass in Heyechong area in the east of Xianghualing area, along the main rock-controlling fault F2 in Xianghualing ore field. Niziling biotite granite is exposed in the northeast of the ore block, and sandstone shale of Interstrip Formation (D2t) and carbonate rock of Qiziqiao Formation (D2q) are mainly exposed in the southwest, and F2 fault runs through this area. In the contact zone of Tuziling rock mass, simple skarn (or amphibole) and a small amount of tin-bearing beryllium striate are formed due to magmatic hydrothermal action. Skarns are developed around the contact zone of rock mass in the upper and second layers of argillaceous and calcareous rocks in the interbedded formation, forming plane and lenticular tremolite skarns. The skarn visible on the surface covers an area of about 0.47km2, with strike greater than 3000m, and the thickness of skarn layer is10.5 ~ 23.0 m. The development of skarn is obviously controlled by rock mass, and it tends to become thicker and larger towards the deep. The ore bodies of this type of deposit occur in simple skarn bodies formed by argillaceous calcareous sand shale in the upper part of the interbedded formation in the contact zone (D2t3) and the upper part of the second layer in the middle (D2t2-2). The ore body is layered and lenticular, and the occurrence of ore body is basically the same as that of rock stratum. According to the occurrence and distribution characteristics of ore bodies, it can be divided into upper and lower layers, namely, I mineralized layer in the upper member of the interbedded formation (D2t3) and II mineralized layer in the second layer in the middle (D2t2-2). Among them, the controlled strike of I mineralized layer has extended over 3000 meters, with an inclination of 40 ~ 50 and an inclination of 30 ~ 45. Drilling, manhole investigation and systematic grooving sampling control three tin ore bodies in mineralized layer I, and the ore bodies are numbered I- 1, I-2 and I-3. Ⅱ mineralized layer is small in scale, with a thickness greater than 4m, and its tin content is 0.09% ~ 4.35%. Two tin ore bodies are controlled in the mineralized layer through the investigation of man-hole and systematic grooving sampling project, and the ore bodies are numbered II- 1 and II-2. The characteristics of the three ore bodies in I mineralization layer are described as follows: I- 1 Ore bodies are distributed in line 33-line 39 of the ore section, and the strike length of the ore bodies is controlled to be 600m, the elevation of the ore bodies is 500-700 m, the dip angle is 200-300 m, and the dip angle is 40 and 35. The thickness of ore body is 0.90 ~ 1 1.04m, with an average of 4.60m, and the coefficient of variation of ore body thickness is 1.52%. The average content of tin in a single project is 0.24% ~ 0.37%, the average content of ore body is 0.39%, and the variation coefficient of content is 22%. I-2 orebody is distributed in the ore section 18-39 line, with strike extending by 2 100 m, dip deepening by 60-300 m, dip angle of 40 and dip angle of 35-55. Ore body thickness 1.20 ~ 18.94m, with an average of 4.94m, and thickness variation coefficient 104.34%. The average content of tin in a single project is 0.2 1% ~ 1.22%, the average content of ore body is 0.69%, and the variation coefficient of content is 64.2%. I-3 ore body is distributed in the 8- 14 line of ore section, with strike extending 600 meters, buried depth extending 50-250 meters, dip angle 50 and dip angle 35-40. The ore body is shallow buried with strong weathering and denudation, and the residual part can be divided into three ore sections with average thickness of 4.48m, 4.13m and 6.10m respectively, and the average tin content in the ore body is 0.75%, 0.47% and 0.3 1% respectively. The natural type of ore is cassiterite sulfide type. The mineral assemblage is mainly cassiterite, pyrrhotite, pyrite, arsenopyrite, magnetite, actinolite, tremolite, garnet and pumice, and there are a few nonmetallic minerals such as galena, marmatite and wolframite. Ore structures include disseminated structures, massive structures, veinlets and reticulated veinlets. The wall rock alteration is mainly skarnization and hornblende. ② Heyechong-Nanjiling granite porphyry Sn-Pb-Zn-Ag ore body. Orebodies mainly occur in γ π (Ⅰ) and γ π (Ⅱ) dikes, numbered Ⅰ and Ⅱ respectively. Their occurrence is the same as that of dikes. The ore bodies are in the form of large veins and plates, which expand and contract synchronously with the dikes. Generally, the upper part of dike has weak mineralization, small thickness, strong mineralization and large thickness in the deep part. Its mineralization has obvious zonation. In the complete dike, from top to bottom, it is quartz porphyry (no mineralization) → granite porphyry (weak PbZn mineralization and pyritization) →PbZnAg mineralization →SnPbZn mineralization →Sn mineralization → greisenized granite porphyry (no mineralization at the root of dike). 1 tin ore body occurs in γ π (Ⅰ) vein, with strike length of about 500m and mineralization depth greater than110m. The occurrence of the ore body is consistent with the dike, and the ore body is in the form of plate vein and lens, with a thickness of 1.95 ~ 10.55 m and an average thickness of 4.37 m, with an average content of 0. 10% ~ 1.60% and an average content of 0.44%. Ore body Ⅱ is a tin-lead-zinc-silver ore body, which occurs on γ π (Ⅱ) vein. The controlled sn-Pb-Zn ore body has strike length of 1845m and dip depth of 250m, which is located between line 3 16 and line 352. The thickness of the ore body is 2.57 ~ 8.70 m, with an average thickness of 5.03m and a thickness variation coefficient of 33.8 1%. The average contents of ore bodies are Sn 0.58%, Pb 1. 1% and Zn 0.86%, and the variation coefficients of contents are: Sn 7 1.67%, Pb 100% and Zn1/kloc-0. Ore types include cassiterite chronological type, cassiterite greisen type, cassiterite sulfide type and sulfide type (suitable for lead and zinc). Ore structures mainly include disseminated structure, massive structure and reticulated vein structure. Alteration in dike is closely related to mineralization, including greisenization, topaz fluorination and fluorination, and the corresponding mineralization is tin mineralization, tin-lead-zinc mineralization and lead-zinc-silver mineralization. The mineralization intensity of dike corresponds to the alteration intensity. ③ Altered bottom conglomerate tin ore body. The ore body occurs in the basal conglomerate with angular unconformity contact with Cambrian at the bottom of sandstone in the interbedded formation. The ore body is layered and quasi-layered, and the occurrence of the ore body is consistent with the bottom conglomerate. The shape of the ore body expands and contracts synchronously with the bottom conglomerate layer, and the mineralization is concentrated in the structure and fracture development parts. Heyechong-Nanjiling mining area controls three ore bodies Ⅲ, Ⅳ and Ⅴ, Palm Mountain-Guantianling mining area controls Ⅳ 1 tin ore body, and Tieshaping mining area controls Ⅳ 1 tin ore body. Now it is divided into the following parts: no. Ore body ⅲ: distributed in the ore section east of the 30 1 line, with strike length of 700 meters, dip of NNW-NNE, dip angle of15 ~ 30, ore body thickness of 0.35 ~ 2.00 meters, average thickness of 1.32 meters, and thickness variation. The average content of Sn in a single project is 0. 10% ~ 4.60%, the average content of Sn in ore body is 0.62%, and the coefficient of variation is 72%. The estimated tin resource of 334 1 is 2.02× 104t. Ore body Ⅳ: It is located on line 302 -328, with strike length 1400m, dip angle of 500m, dip angle15 ~ 34, thickness of 0.85 ~ 4.08 m, average thickness 1.80m and thickness variation coefficient of 50. The average content of a single project is 0. 12% ~ 0.73%, the average content of ore body is 0.39%, and the coefficient of variation of content is 58%. Ore body ⅴ: It is distributed along the 326-342 line, with strike length of 700m, dip angle of 200m,15 ~ 30, ore body thickness of 2.20 ~ 2.30m, average thickness of 2.25m, thickness variation coefficient of 2.67%, and average SN content of a single project of 65,438. Orebody ⅵ: It is distributed between Line 332 and Line 308 in the Palm Mountain-Guantianling mining area, with the strike length controlled at 800 meters and the dip angle extended by 400 meters. The orebody inclines to the northeast or northwest with an average dip angle of 30, and the thickness of the orebody is1.16 ~1.44m, with an average thickness of/kloc. Ore body VII: controlled by trench drilling project in 2006, it is distributed in Tieshaping Line 37-Line 40, with a strike of over 500 meters and an inclined extension of 300 meters, inclined to the northeast with an inclination of 30 ~ 30 degrees. The thickness of ZK400 1 drilled ore body is1.76m, and the tin content is 0. The main minerals in the ore are pyrite, pyrrhotite, arsenopyrite, cassiterite, timely, tremolite and actinolite, with a small amount of galena, marmatite, chlorite, fluorite and topaz. The ore structure is breccia disseminated structure and reticular vein structure. The natural type of ore is cassiterite sulfide type, and the industrial type is layered tin ore. The wall rock alteration is mainly skarnization and silicification.
2. Bored core collection
In Hehuaping area, the focus of work is the layered skarn-type tin polymetallic deposit in the transition layer between Tiaojian Formation and Qiziqiao Formation of Middle Devonian, taking into account the altered fracture zone type (cassiterite-sulfide) and altered porphyry vein type deposits. Collect and save 2 boreholes in this mining area.
ZK950 1 drilling, the hole depth is 303. 13m, which penetrates two layers of ore bodies. Including two types controlled by horizon (impure limestone of Qiziqiao Formation of Middle Devonian and sandstone transition layer of Tiaojian Formation) and fault structure or porphyry. Limestone, marble, marbled limestone, altered granite porphyry, skarn, skarn-type tungsten-lead-zinc ore and lead-zinc magnetite skarn-type tin ore can be seen in the cave. Skarn-type W-Pb-Zn deposits are grayish green, dark green and brownish red. Metal minerals are mainly sphalerite, galena, magnetite and chalcopyrite, with granular structure, disseminated, star-shaped, massive and veinlet structure. Lead-bearing zinc magnetite skarn tin ore is grayish green, dark green, black and brownish black. Metal minerals are mainly magnetite, marmatite and galena, with occasional spotted cassiterite, granular texture, disseminated, spotted and massive texture.
The borehole ZK470 1, with a hole depth of 350. 15m, passes through multilayer lead-zinc ore bodies and 1 layer tin ore bodies, as well as marble, skarn, skarn-type lead-zinc ore, lead-zinc vein, lead-zinc magnetite skarn, magnetite-bearing skarn, lead-zinc magnetite ore, lead ore and magnetite skarn type. You can see it in the cave. Lead-zinc mineralized ores are mainly gray-dark gray, gray-green, brownish red, fine-coarse, veinlets disseminated, disseminated, star-shaped and massive, and metal minerals are mainly galena, sphalerite, marmatite, pyrrhotite, magnetite and pyrite. Magnetite-skarn tin deposit is dark gray, gray-green, iron-black, smoky gray, fine-grained structure, veinlet disseminated, disseminated and star-shaped structure. The metal minerals are mainly pyrrhotite, magnetite and pyrite, and stellate micro-cassiterite can be seen locally.
Three types of deposits have been found in Xianghualing area, namely skarn-like layered tin deposits in the argillaceous sandstone formation of Tiaozhou Formation near the contact zone of rock mass and granite porphyry vein tin polymetallic deposits in Tiaozhou Formation altered conglomerate tin deposits. Collect and keep two boreholes in the mining area.
ZK350 1 borehole is 84.07m deep, located in the Heyechong ore section in the north of the mining area, and passes through two layers of tin ore bodies. Banded dolomite, fine limestone, skarnized sandstone, contact metamorphic rock, gray-green argillaceous sandstone, tin-bearing skarn, pyritized sandstone, argillaceous sandstone, granite fine-grained rock and biotite granite can be seen in the hole.
Borehole ZK400 1, with a depth of 24 1.7 1m, is located in Tieshaping ore section in the north of the mining area and passes through three layers of tin ore bodies. There are argillaceous sandstone, timely sandstone, tungsten-bearing fracture zone, skarnized sandstone, skarnized dike, skarnized sandstone, skarnized fracture zone and altered basement conglomerate in the hole.
3. Relevant information
1) Topographic and Geological Map of Hehuaping Mining Area in Chenzhou City, Hunan Province (electronic1:10000);
2) Line 47 of Hehuaping Mining Area in Chenzhou City (electronic1∶ 2000);
3) Line 95 of Hehuaping Mining Area in Chenzhou City (electronic1∶ 2000);
4) ZK950 1 borehole histogram of Hehuaping mining area in Chenzhou City (electronic1∶ 200);
5) ZK470 1 borehole histogram of Hehuaping mining area in Chenzhou City (electronic1∶ 200);
6) Work plan for evaluation of Hehuaping-Xianghualing tin polymetallic deposit in Chenzhou, Hunan Province in 2007;
7) List of ZK950 1 Boreholes in Hehuaping Mining Area of Chenzhou City;
8) List of ZK470 1 Boreholes in Hehuaping Mining Area of Chenzhou City;
9) Comprehensive geological plan of Xianghualing North District, Linwu County, Hunan Province (electronic1:10000);
Line 35 10 (electronic1∶ 2000) of Heyechong ore section in the north area of Xianghualing, Linwu County;
1 1) No.40 section of Tieshaping mine section in the north of Xianghualing, Linwu County (electronic1:2000);
12) ZK350 1 borehole histogram (electronic1∶ 200) of Heyechong ore section in the north area of Xianghualing, Linwu County;
Borehole histogram (electronic1:200) of Tieshaping ore section 13 in the north area of Xianghualing, Linwu County;
14) ZK350 1 drilling catalogue of Heyechong ore section in Xianghualing North District, Linwu County;
15) Drilling Table ZK400 1 of Tieshaping ore section in Xianghualing North District, Linwu County.