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Identification of the lead-zinc ore deposit

Release date:2018-12-21  source:中南选矿网  Browse times:113
(1) The mineralization of ore-bearing ore undergoes the following evolutionary process: 1. There are two main ore-bearing ore-bearing rocks: iron-bearing silty sand-fine sandstone and alteration (seri sericitization) granitic fine-grained rock, two The deformed structure of the developed ductile-brittle shear zone on the contact belt causes the physicochemical properties of the argillaceous silt-fine sandstone and the strong sericitization of the granite fine-grained rock. 2, through moderate-strength tough-brittle shear structure deformation-metamorphic recrystallization, resulting in mud, siliceous cement recrystallized into scale microcrystalline sericite and microcrystalline quartz, silt-fine sand quartz crumb lengthening or eyeball (Photo 1), the rock shows the physicochemical structure. The deformation of the sulphur-containing iron rock-metamorphic recrystallization is uniform dispersion of the fine pyrite. The granitic fine-grained rock is strongly sericitized. 3. After fragmentation and breccia lithification, the ore-bearing hydrothermal activity is strong, which leads to the mineralization of lead, zinc and strontium. The filling is replaced by the fractured iron-bearing silt-fine sandstone and breccia. Mud silt - fine sandstone fissures and structural cement matrix. (II) Mineralization characteristics and metallogenic evolution 1. The early stage of hydrothermal fluid is characterized by pyrite and a small amount of toxic sandification, and the tectonism synchronized with it is the physicochemical formation of rock, which is highly likely to be associated with gold mineralization. There is a close relationship between the characteristics of the proliferative annulus structure of the pyrite found under the microscope (photos 6, 15, 16), and the gold is sampled and analyzed. 2. In the middle stage of hydrothermal fluid, the yellow iron-flash zinc-lead-lead mineralization is closely related to the fragmentation-breccia lithification structure, and mineralization occurs from the fracture of the deformed rock (pyrite-sphalerite mineralization). Continue to the beginning of breccia (triangular mineralization). 3. The stibnite-iron carbonation in the late stage of hydrothermal fluid. At this stage, the ore-forming and breccia are closely synchronized. Some stibnite ore along the edge of the galena grain forms a mixed crystal of two minerals. 4, the formation of two types of ore: physicochemical yellow iron mud silt - fine sandstone type breccia - lead zinc (gold) ore (photo 2) and altered granitic fine-grained breccia 锑 - lead Zinc (gold) ore. The bismuth-lead-zinc polymetallic deposit belongs to the medium-low temperature hydrothermal deposit related to tectonic deformation. It is noted that gold mineralization may occur in the physicochemical stage, which should be verified by sampling and testing. (3) The mineral composition, structure and ore type of the ore may be divided into two types of ore. The specific characteristics are as follows: 1. Physicochemical yellow iron mud silt - fine sandstone type breccia - lead zinc ( Gold) ore mineralized rock is first physicochemically deformed by ductile-brittle structure, and at the same time, micro-disseminated toxic sand-pyrite mineralization occurs; further brittle structural fragmentation causes altered mineralized physico-chemical yellow iron muddy sand- Fine sandstone breccia lithification, multi-stage multi-stage gold, lead-zinc, and strontium mineralization accompanied by progressive tectonic activities occur simultaneously. The ore structure and mineral composition are as follows: (1) Quartz (21%) has three genetic types: 1 quartz silt, fine sand f=0.02~0.05 ́value=".1" unitname="mm" style="word- Break: break-all; line-height: 26px;">0.1mm, the rock is obviously subjected to moderate tough and brittle structural deformation due to the deformation of the microscopic elongated or microscopic eyeballs (Photo 1). The ore is related to the tectonic activity; 2 the siliceous cement is deformed to form a variable crystallite f=value=".01" unitname="mm" style="word-break: break-all; line-height: 26px;"> 0.01mm or less, mixed with recrystallized sericite, containing about 8%; 3 silicified quartz fine agglomerate-disseminated, fine veins, semi-self-shaped polygonal shape and strip fine crystal, f=0.05~0.1 ́value= ".3" unitname="mm" style="word-break: break-all; line-height: 26px;">0.3mm, close to the pyrite and sphalerite. (2) Sericite (18%) microscopic scale-like aggregates, which are collectively matt, showing the physical and chemical properties of the rock fragments (Photos 1, 2), which are caused by recrystallization of the original rock mud. (3) Pyrite (14%) two genetic types: 1 physicochemical distribution of fine cubic pyrite along the rock, f=0.02~value=".1" unitname="mm" style="word-break : break-all; line-height: 26px;">0.1mm, which is formed by metamorphism-deformation and recrystallization of sulphide-bearing silt shale; 2 hydrothermal-generating fine-grained, agglomerate-dip-dyed distribution, f= 0.05~value=".3" unitname="mm" style="word-break: break-all; line-height: 26px;">0.3mm cube-shaped self-shaped crystal, the largest particle f=value="2" unitname ="mm" style="word-break: break-all; line-height: 26px;">2.0mm. (4) Sphalerite (17%) his shape-semi-self-shaped unequal-grain equiaxed grain, f=0.1~value="1.4" unitname="mm" style="word-break: break-all; Line-height: 26px;">1.4mm medium coarse aggregate, closely related to silicidation and pyrite mineralization. (5) Galena (5%) semi-self-shaped, his shape is not equal to granular f=0.1~value="1.6" unitname="mm" style="word-break: break-all; line-height: 26px; ">1.6mm, along the edge of the sphalerite grain or filled in the sphalerite grains, the inner triangle of the grain develops (Photo 5), and some of the coarse-grained galena edges are replaced by stibnite (Photo 3) . (6) stibnite (4%) fiber bundle, fiber columnar fine crystal, microcrystal, there are three types of inlay: 1 columnar fine crystal aggregate (photo 4); 2 fiber bundle micro-fine crystal f = 0.02 ́value=".3" unitname="mm" style="word-break: break-all; line-height: 26px;">0.3mm, along the edge of the galena grain (photo 3); 3 fiber Column crystallite f=0.001 ́value=".05" unitname="mm" style="word-break: break-all; line-height: 26px;">0.05mm messy cloth in iron carbonate minerals ( Photo 6). (7) Iron dolomite (12%) semi-self-shaped fine-grained inlaid aggregate filled with breccia gap minerals (Photo 18), f=0.05~value=".15" unitname="mm" style="word-break : break-all; line-height: 26px;">0.15mm. (8) Iron calcite (8%) semi-self-shaped fine-grained inlaid aggregate is filled with minerals in the breccia gap, f=0.1~value=".3" unitname="mm" style="word-break: break-all; Line-height: 26px;">0.3mm. The ore structure is made of breccia and filled with rubber; the ore structure: fine pyrite-toxic sand is fine veind, square lead-flash zinc-chalcopyrite-silicified quartz is interposed and contains structure; stibnite- Iron dolomite is a filling-interstitial structure. 2. Alteration of granitic fine-grained breccia-lead-zinc (gold) ore-series granitic granitic fine-grained rock may be related to ductile-brittle tectonic deformation, and further brittle tectonic fragmentation causes alteration The breccia of granitic fine-grained rocks, multi-stage and multi-stage gold, lead-zinc and antimony mineralization are accompanied by progressive tectonic activities and occur synchronously. The ore structure and mineral composition are as follows: (1) Sericite (26%) microscopic scale aggregates, inheriting the slab-like matrix albite and slab-like albite fine spots (photos 7, 8), f=0.05 ́ 0.1~0.1 ́value=".4" unitname="mm" style="word-break: break-all; line-height: 26px;">0.4mm; part is hydrothermal alteration product. (2) Sodium feldspar (14%) semi-automorphic grain and fine plate (Photos 7, 8). (3) Quartz (7%) his shape fine particles f=0.04~value=".1" unitname="mm" style="word-break: break-all; line-height: 26px;">0.1mm, magma Mineral composition; part of hydrothermally altered silicified quartz, closely related to pyrite-sparkle mineralization. (4) Potash feldspar (10%) his shape fine grain f=0.05~value=".1" unitname="mm" style="word-break: break-all; line-height: 26px;">0.1mm . (5) Pyrite (7%) f=0.02~value=".3" unitname="mm" style="word-break: break-all; line-height: 26px;">0.3mm self-forming fine particles Crystal and fine grain, roughly divided into three mineralization stages, fine particles, fine particles and semi-self-shaped fine-grained polycrystals. Among them, the fine-grain-fine particles have a proliferative annulus structure (photographs 15, 16), which is closely related to fine gold mineralization. (6) Aromatic sand (3%) f=0.02 ́0.05~0.15 ́value=".6" unitname="mm" style="word-break: break-all; line-height: 26px;">0.6mm fine Columnar, spear-shaped fine crystals (photos 9, 13, 14), closely associated with the micro-proliferation ring-bearing pyrite. (7) Sphalerite (1.5%), his shape is round and granular, f=0.2~value=".6" unitname="mm" style="word-break: break-all; line-height: 26px;">0.6mm (Photo 10), part of the sphalerite grains contain fine columnar crystalline stibnite (Photo 12). (8) Chalcopyrite (0.5%) his fine grain, f=value=".05" unitname="mm" style="word-break: break-all; line-height: 26px;">0.05mm the following. (9) stibnite (2%) two kinds of grain morphology, two stages of stibnite, the former microcrystalline fiber column f=value=".003" unitname="mm" style="word-break: break -all; line-height: 26px;">below 0.003mm (photo 17), the latter bundle assembly f=0.02~value=".3" unitname="mm" style="word-break: break- All; line-height: 26px;">0.3mm or so (photo 11). (10) Iron dolomite (29%) semi-self-shaped fine-grained inlaid aggregate is filled with breccia gap mineral, f=0.05~value=".15" unitname="mm" style="word-break: break-all ; line-height: 26px;">0.15mm. The ore structure is breccia-like and filled with rubber structure; the ore structure: fine pyrite-toxic sand is fine vein disseminated, and the lead-dextinc-chalcopyrite is substituted and contained structure (photo 12); stibnite is Filling - gap filling structure. (IV) Points to note on grinding and beneficiation 1. The ore is composed of lead-zinc and strontium polymetallic mineralized minerals, all of which can be used by the industry and need to be comprehensively utilized. Separation of sphalerite, galena, stibnite and pyrite should be considered separately for the beneficiation design. 2. The stibnite is an important recycled mineral of the ore, but there are three types of grain: fine fiber column f=0.001~value=".05" unitname="mm" style="word-break: break-all; line-height : 26px;">0.05mm (photo 6), fine and fine aggregates f=0.02~value=".3" unitname="mm" style="word-break: break-all; line-height: 26px; ">0.3mm (photo 3, 4). It is difficult for fine-grained grade beneficiation, mostly inlaid crystal inclusion structure, which is difficult to recover; and some stibnite and galena are mixed and grow together, which is difficult to be finely dissociated. A fine grinding tailings will have fine bismuth ore and will not be recovered. Increasing grinding fineness may result in higher costs. (V) Analysis of the possibility of occurrence of gold mineralization 1. The ore-forming element combination from the commission consists of: Fe, As, Sb, Pb, Zn, Cu, etc. The combination of the above elements is very beneficial to the mineralization of gold. It is also a common combination of elements closely related to gold, which should be taken seriously. 2. The proliferative annulus structure of fine-grained pyrite is found in the ore (Photos 13, 14), which is the mineralogical structure of the fine-grained gold deposit. 3. The poisonous sand and stibnite are found in the ore, which contains As and Sb, which are mineralization minerals and metallogenic components which are more closely related to gold. In general, the state of occurrence of this type of gold ore appears in the form of invisible submicroscopic gold. 4. The mineralization of the bismuth-lead-zinc polymetallic and gold may be produced in the ductile-brittle shear zone of the fine-grained granite veins or rock masses and the contact zone of the iron-bearing silty sandstone. Gold mineralization mainly occurs in the early stage of the ductile physicochemical zone, and bismuth and lead-zinc mineralization occurs in the late stage breccia. 5. It is recommended that the mine geology immediately organize the sampling and analysis of the grade of the test gold.

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