ore structure, complex structures, euhedral - semi-idiomorphic granular crystalline, anhedral crystal mosaic account of residual granitic metacryst, ranging from grain structure. Ore construct massive, disseminated, mass, banded, stockwork, mottled and brecciated, jelly, and a zonal structure.
many types of minerals have been found more than 110 species. Among them, the iron oxides magnetite, hematite, and the illusion of hematite, limonite, etc., of the deposits of iron minerals; carbonate minerals siderite and magnesium siderite, iron, magnesium Ling manganese, iron and dolomite; sulfide pyrite, pyrrhotite, sphalerite, galena, chalcopyrite; silicate mineral riebeckite, arfvedsonite, biotite, aegirine; niobium (tantalum) mineral niobite manganese niobite; aeschynite minerals pyrochlore the ilmenite - niobite, Baotou mine fersmite, brown cerium niobium ore, brown yttrium niobium ore; rare earth minerals monazite, bastnaesite World Steel Pipe News , followed by the Yellow River ore, allanite, fluorocarbon barium cerium ore, the fluorocarbon calcium cerium ore, cerium apatite, Daqingshan ore, carbon cerium sodium ore, etc.; uranium (thorium) mineral well and thorite, thorite; containing strontium barium strontium minerals pyrochlore, β-Ca strontianite, calcium and strontianite; mineral containing barium barium ilmenite, barium iron manganese and siderite barium manganese.
therare earth minerals and associated niobium minerals and iron ore, rare earth content of the iron ore grade was negatively correlated. Niobium ore body 348 in the West Mine and its surrounding rock Chinese Communist circle, its length of 500 ~ 600m, the average thickness of 80 ~ 88m deep 300 ~ 340m.
the mine, including mine, East mine, West Mine and East Kai-Spengler and other ore block. 18km long, wide and 1 ~ 3km area of 54km2. Exposed strata of the Middle Proterozoic Bayan Obo group. Bayan Obo group is a shallow sea similar flysch-type construction, consisting of quartzite, sandstone, slate, and crystalline limestone. Their lithological association is divided into nine rock group, 20 rock section. The mining area exposed nine rock section of the four rock groups (H1 ~ H9). Large-scale iron, rare earth, niobium deposit Fu existence of black limestone, dolomitic limestone and dolomite rock section 8 (H8,), the rock section thickness of 270m, the thickest 870m. In the rock of the upper part of the rock section 9 (H9), H9 is light-colored - dark siliceous slate, calcareous slate, folder dark gray metamorphic fine-grained quartz sandstone, 160m thick, the rock section is rich in potassium its own characteristics. Dark slate containing of K2O 8% to 10%, up 15.7 percent; containing a light-colored slate of K2O from 9% to 15%, accompanied by high lanthanum, cerium, niobium, and radioactive elements. Bayan Obo group formation
orebody scale: East ore body length 1200m, width 50 ~ 350m, lenticular; the main ore body length 1250m, 410m wide, lenticular; West ore body: oblique tectonic control of ore bodies (Fig. 3.2.20). Five main ore body length of 600 ~ 4100m, average thickness of 2.8 ~ 27m orebody bedded, lenticular; East mediated Spangler ore body: not connected by a number of small ore bodies, tens of meters long wide, a few meters to more than 10 meters from east to west, dip 50 ° to 70 °.
, according to their mineral composition can be divided into a dense massive magnetite dense massive hematite, dolomite, magnetite, quartz-magnetite, fluorite magnetite or hematite, aegirine-magnetite, mica, iron ore, iron ore of the hornblende and siderite ore.
total proven iron ore reserves (A + B + C + D) 1.467 billion tons, of which A + B + C level of 883 million tons of rare earth oxides 8600 million t, of Nb2O5 2World Steel Pipe .8 million tons, also with fluorite, barite (paragenetic).
Bayan Obo main ore, East ore being mined, the design of open pit size of 12 million t / a.
within the mining area is an east-west syncline the orebodies shaped consistent with the surrounding rock, and strictly control by the syncline.
average ore grade: of TFe 33% ~ 35%, F 0.4% to 0.8%, S 1.2% to 1.9%, P 0.4% to 0.8% of Mn 0.6% ~ 2 %, Nb2O5 0.07% ~ 0.28%, TR2O3 3% ~ 6%.
thearea exposed granite gray gneissic biotite monzogranite as veins east-west extension, invasive H3 slate and H8 dolomite; shallow yellowish gray fine-grained like the porphyritic biotite granite was rock discoidal vein is located in the mining areas in southern, northern and western. Both granite, are late Hercynian product. In addition, there are basic diabase, diorite, diorite porphyry, albitite and acidic pegmatite, granite porphyry, quartz porphyry dikes and so on.
Mine is located in Baotou City. Department of China's famous super-large iron, rare earth, niobium comprehensive deposit. The deposit is called the Bayan Obo type deposits, its causes are different opinions: mainly sedimentary-metamorphic thermal dynamic metamorphism - hydrothermal multiple superimposed complex deposits. In addition, special high-temperature hydrothermal; deposition - hydrothermal metamorphism; containing the rare metal carbonate magma and volcanic deposition; carbonate magma intrusion and ancient-concave (Inland Sea), semi-closed lacustrine sediments and stratabound iron deposition - dynamic metamorphism causes of views.