In order to make a synthetic assessment about filling schemes optimization，the synthetic assessment index system of filling scheme was established according to the analytic hierarchy process（AHP） and TOPSIS methods.Based on the four filling schemes optimization in a metal mine，considering the economic，technical，security and etc，which influenced the evaluation indexes（filling difficulty level，roof-contacted filling level，settlement of filling body，strength of filling body，etc） of filling schemes，the influence factor indexes of the filling schemes were transformed into multi-factor decision matrix；the weight of the influence factors matrix were gotten according to the AHP method，and then，the AHP-TOPSIS multi-factor decision model was established with the fundamental theory of TOPSIS，and the synthetic superior degree of the four filling schemes were obtained.The research results show that the synthetic superior degree of filling schemes are 36.2%，85.2%，57.6%，32.0%，respectively，according to the method，and thus determine the second scheme（consolidated filling method） is the optimal one.The optimization scheme is consistent with an actual mining，filling effect is good.Practical application shows that the decision model provides a new method to the filling schemes optimization.
Taking the paste filling project of Guizhou Kailin Group as the project backgrourd，the phosphogypsum paste backfill as the main object，the strength characteristic test of Phosphorus gypsum filling paste was conducted by using laboratory testing and theoretical analysis.The study determinated the compressive strength and tensile strength of the test cube in different dosage of phosphorus slag，additives and paste concentration in different ages （7，14，28 d），analysis shows that the obtained specimen compressive strength increases with phosphorus slag content increases；paste filling body strength increases with the concentration and enhance the quality of the paste.The constitutive model of the phosphogypsum paste-backfill was established by using FLAC3D，and the numerical verification show that the paste filling deformation characteristics was in line with Moore-Coulomb numerical model.
To explore the relationship between slurry setting time and compressive strength of high-sulphur backfill，an laboratory experiment was carried out，on the basis of tailing’s sulfur content is 25%.The experimental data was analyzed by Origin mathematical software，and the internal microstructure of high-sulphur backfill was observed through SEM.The change law of high-sulphur’s compressive strength in the different condition of slurry setting time was studied.The results show that there is a function relationship between the slurry setting time with different age’s compressive strength of high-sulphur，which bases on the reasonable range of setting time.When the setting time shortened by 15.49%，the early strength increased by 136.17%，but the long-term strength decreased by 19.63%.On the contrary，when the setting time extended by 9.8%，the long-term strength increased by 40.48%，and the long-term strength’s growth pattern was similar to index type.The essence of reducing lost of high-sulphur’s long-term strength is to ensure the uniformity of the microstructure.The research results of this paper can provide reference for high-sulphur mine’s filling work.
Mujicun Cu-Mo polymetallic ore field is located in the north Taihang Mountains metallogenic belt，Fuping mantle branch structure and Shanghuangqi-Wulonggou fracture of the composite.Metallogenic potential is tremendous，but the structure is complex，low degree of research.In this study，structure analysis and petrographic analysis of drilling in Mujicun ore field was conducted.Comprehensive analysis and conclude：（1）The same period of porphyry diorite distribution in the region is controlled by NE folds and NNE faults，which developed on its join；（2）In Mujicun ore field，F4 fault is a shovel-type normal fault，which dislocated the regional detachment faults，and communicate deep magma，formed the Mujicun rock mass，which is the main structure of rock-ore controlling；（3）The contact between rock mass and surounding rock is the main migration pathway of ore-bearing fluid，and F4 fault that controlled Xiaoligou，Tieling ore deposite is another migration way；（4）Alteration from inside to outside is divided into strong silicified zone，potassic alteration zone，quartz-sericite alteration zone，strong sericitization and propylitization zone，peripheral is skarn zone，tending to NNW which controlled by faults.
Yuerya gold mine is a large-sized gold deposit that exists in the small granitic body.In order to explore this kind of gold mine，by researching and summarizing the minerogenetic condition and regularity of Yuerya gold mine，and then using recourse method along the northeast trending fault zone that controls Yuerya rock mass，a northeast trending granite-porphyiy vein was found in Dongshan of Erhedian，which is aboat 7 km miles away from southwest of Yuerya gold mine.This granite-porphyry dyke is similar to the ore-bearing granitic body of Yuerya in macroscopic view and lithology according to this clue.Most quartz in this dyke is in the shape of hexagonal bipyramid and it is high temperature β quartz.This shows that there may be developing mesothermal granitic body deep in the Earth.Besides，there are two developing northwest trending gold-bearing quartz veins on the southern side of this dyke and the variation trend of grade and thickness indicates that ore-forming fluid forms in the deep part of this granite dike.Besides，a gold geochemical anomaly was delineated around this dike.Thus it can be seen that there may be a second developing gold-bearing granitic body deep in the earth.This also can provide clues and basis for geological survey of buried Yuerya gold mine.
Chounikou gold deposit is located on the south side of Mapeng granitic intrusion in the middle of Taihang Mountains，and is an important gold metallogenic target area discovered in recent years in the Mapeng area.The ore-forming geological condition is superior in the area，which is characterized by the near SN trending and NW trending mineralized alteration zones with intensive distribution and large scale.On the basis of taking the mantle branch structure metallogenetic theory as a guide and analyzing the geological characteristics of the mining area，the paper points out the faults are the main ore-controlling factors of the deposit；the ore-forming materials are mainly from the deep earth and the mineralization-solutions are mainly from the magmatic water；during the strong tectonic activity of Fuping mantle branch structure in the Yanshanian period，the deep ore-forming material which could be carried in the Mapeng granitic intrusion，migrated upward to the shallow favorable structural position of SN trending and NW trending fracture zones，ect.，for the enrichment and the mineralization.On the basis of this，it puts forward the future prospecting direction.
In the 1990s，the Boka gold deposit was first found in paleo-mesoproterozoic strata in Dongchuan district，Yunnan Province.The genesis of the deposit is still controversial.In order to determine the characteristics of its ore genesis，this study examine the genetic mineralogical characteristics of pyrites of different generations from the Boka gold deposit using optical microscope（OM），powder and in-situ X-ray diffraction（XRD），electron microprobe analyses（EPMA）.The results show that pyrites from the deposit can be divided into three generations.Py1 has undeveloped zoning structure and the smallest lattice constant of the three.It has enrichment in S and depletion in Fe，low As，Co，Ni.It formed in a magmatic hydrothermal environment.In Py2 repair growth and zoning structure are developed very well and the lattice constant is the largest.The enrichment in S is lower than in Py1，it has depletion of Fe，high As，Co，Ni.Its deposition was related to mixed magmatic and underground thermal brines.Py3 is crushed and granulated，with minor euhedral crystals formed by dynamic metamorphic recrystallization.It has enrichment of S and depletion in Fe.The degree of S enrichment is significantly lower than Py1 or Py2.The lattice constant and As，Co，Ni contents are between Py1 and Py2.These results indicate the deposit originally formed in an environments similar to Py2 in the Indosinian-early Yanshanian and subsequently underwent a deformation-metamorphic stage in Himalayanian.Among them，the single magmatic hydrothermal ore-forming fluid in magmatic hydrothermal stage has been evolved the double-sources of those fluids in the mixture stage.This study shows that the Boka deposit is a magmatic hydrothermal type gold deposit which was transformed by dynamic shear deformation and metamorphism that resulted in further enrichment of the orebodies.
The genetic of Boka gold deposit in Dongchuan area of Yunnan Province has always been contro- versial，the genesis of the deposit is the premise to realizing the prospecting，and because the genesis of Xinshan gold deposit is fuzzy，the progress of actual prospecting work in the area is unsatisfactory.To census and analyse the structure of this area by using statistical method，combined with the tectonic evolution of this area and the typical structural characteristics to divided stage，the analysis of geological structures in this area and the return of structural stress field during and post mineralization shows that the tectonic field stress and the nature of geotectonics in this area experienced great changes during that time.The mineralization occurred from Indochina to early Yanshan Period.The Riedel Shear zones derived from the main fault provided good road for gold-bearing thermal flow and space for the distribution of gold deposits that benefited from the movements and the progressive formation during that time.Himalayan movement only made the gold orebody in this area experienced dynamic metamorphism.
No.171 ore vein in Dongfeng deposit is located in the southeastern of Linglong gold field，has superior ore-forming geological condition.Based on the previous work and scientific research results，3D model of orebodies was constructed.By statistical analysis，spatial correlation and random factors of gold grade distribution was discussed.With the study of mineralization regularity and trend analysis，integrative consider with the characteristics of ore-controlling factors.It is suggested that in the ore strike direction there are two mineralization enrichment zones，as north-west zone in the upper part of the deposit and south-east zone in the lower part，the two zones are very important exploration areas，there are also have large prospecting space in the ore deep direction.
With the increasing of mining depth，the mine ventilation systems become more and more complex， working face location farther away from the main ventilating fan of the earth’s surface than they are used to be，the main ventilating fan of the earth’s surface can not supply much air to the deep of underground.And it could barely control the deep ventilation.Therefore，it is needed to move the fan into the underground.After the fan is installed in the underground，these could have shorten the distance from the ventilation fan to the working face location.However，these have increase more recirculating air.In order to achieve effective ventilation，ensure the deep of underground could get enough air，the problem of the recirculating air must be effectively controlled.Actually the essence of internal air leakage is the existence of the recirculating air in ventilation system.This paper aims to analyze the formation of recirculating air，propose the evaluation indexes of internal air leakage in ventilation system and develop the software-VentNetLab to get effective control measures.And the evaluation indexes-the efficiency of adjustment could be used to evaluate complexity of mine ventilation adjustment. Multi-level stations ventilation must be used by various mine to achieve effective ventilation.This can carry on the research for the extremely complicated ventilation network，and guidance for rectification mine.
Using the method of finite element combined with MATLAB software to establish mathematical model of nuclide migration of radon diffusion to visualize its diffusion.Conducted numerical calculation and two-dimensional numerical simulation on tunnel walls of uranium mine and mine radon concentration.In the numerical calculation，using finite element method combined with MATLAB programming got semi-infinite medium and infinity one-dimensional curves of radon concentration in the medium.In the two-dimensional simulations using MATLAB PDE TOOL kit translated semi in finite medium and infinity limited thick medium into concrete wall of roadway and room of radon concentration，got tunnel walls radon concentration of radon concentration and ore room specific image.The simulation results can find better solution for reducing the concentration of radon and radon daughter in mines and put forward corresponding radon protective measures to provide a good production environment for the staff in mine.The study has important practical significance for radon radiation protection and can be used as reference for uranium ore district of radiation protection.
As geological conditions complex，mine roadway adverse geologic body had become one of the main safety threat in the roadway drivage construction.In order to improve the mine construction safety and realize mine roadway excavation efficiently，the TRT system was applied to the advanced prediction in underground mining roadway drivage.Combined with the example of roadway drivage engineering cases vein 8# stage 760 of a mine in Hunan Province，designed the mine roadways under the condition of narrow space field detection TRT and advanced detection scheme，the results show that TRT detection system can output the specified geological area reflection seismic wave three-dimensional tomographic images，according to the results of three-dimensional wave field information interpretation constraints to predict a regional geological structures，forecast ahead of roadway excavation is firmly proved.Drivage scheme according to the forecast results of the analysis put forward suggestion to adjust，guaranteed the efficiency and safety of construction.
In order to solve the problems of safety production due to the deposition of pipeline in a deep mine，through the study on the deposition mechanism of deep level pipelines system，and based on solid-liquid two-phase flow theory，the deposition mechanism of two-phase flow pipeline is interpreted from the aspects of fine particulate fouling and coarse particle deposition.The FLUENT fluid dynamics software was used to model and analyze，the fine particles in slurry and the water mixed homogeneous suspension are seem as continuous phase，coarse particles are seem as discrete phase，and then according to the concentration distribution of the coarse particles in the slurry and the characteristics of the pipe velocity distribution，the characteristics of the particle deposition in the pipeline are determined.The results show that the scaling of the fine particles and the deposition of the coarse particles are the main reasons of two-phase filling flow pipe sediment.The numerical simulation of the two-phase flow filling process is consistent with the theoretical analysis.
In order to improve the decyanation stirring effect of gold-containing wastewater in the stirred tank，a numerical simulation of the flow field and the solid-liquid dispersion was carried out.Multiple reference frame method and Euler- Euler model are used in the simulation experiment.The effects of rotational speed，eccentricity on the velocity field，flow pattern，solid holdup distribution and mixing power in the decyanation process were investigated.The results show that the eccentric mixing can significantly improve the symmetric velocity field and flow pattern，and the flow field is the best when the eccentricity is e=0.2.The near wall lateral flow is enhanced when eccentricity is greater than 0.2，the near-wall circular vortex close to blade area.There is a large circular vortex with weak turbulence in far-wall area，which is not conducive to mixing.Eccentricity is conducive to the dispersion of decyanation agent in the 0~0.2 range.But a large degree of eccentricity will cause the accumulation of cyanide in the near wall side baffle plate.Agitation speed increased from 100 r/min to 1 200 r/min，the power growth rate is more and more fast.The power of two phase mixing is 8.8% higher than that of single phase stirring.Eccentric agitation has the energy saving effect，when the eccentricity increases from 0 to 0.43，the stirring power is reduced by 3.9%.
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