Through prediction examples of two typical deposits，the characteristics and application guidelines of structural superimposed halo practical model are described.It proved that structural superimposed halo law applied to deep prospecting makes the ideas more clearly，much easier to operate and control，and the effect is more significant.Sructural superimposed halo method only studies the axial zoning and superimposed structure of the primary superimposed halo in structural belt，and the sampling position is concentrated in the hydrothermal superimposed parts in structural belt，so it reduces the workload，increases the predicted depth，and the key is to improve the accuracy of the blind ore prediction.The practical model of structural superimposed halo is based on the structure of superimposed halo model，and the new idea of the combination of structural superimposed halo and metallogenic regularity is highlighted.The specific steps are，firstly，study the occurrence characteristics of known ore bodies to determine the beneficial metallogenic space，and then according to the model and the blind ore prediction signs to determine whether there is a beneficial metallogenic space.
The overburden of the earth’s surface is thickness in Zhaishang gold deposit，and there are many concealed gold bearing fractured zone.Field geological work discovery that the boundary between most of gold bearing broken zone and surrounding rock is not clear，and the surrounding rock types of south and north gold belts are different，which leads to a large difference in resistivity.Therefore，it is very necessary to select suitable geophysical method to find gold bearing fractured zone at the edges and deep of south and north gold belts.According to the actual prospecting situation in the gold mine，the controlled source audio frequency magnetotelluric sounding is carried out in the south and north gold belts，and the effectiveness of the method for prospecting is studied.The results show that the resistivity anomaly of south gold belt is consistent with the gold bearing broken belt，the prospecting effect is obvious according to the gradient of high and low resistance anomaly.The difference of rock resistivity in north gold belt is small，and the prospecting effect is poor，especially the rock resistivity of the west part in north gold belt is generally lower，so the method have no significance for prospecting.The results of this research can provide some references for next arrangement of controlled source audio frequency magnetotelluric sounding.
Southeastern Shaanxi is located in the Neoproterozoic-Mesozoic Qinling-Dabie orogenic belt，the southern Yangtze Craton.Through the Jinning，Caledonian，Indosinian Yanshan period of tectonic evolution，a series of basic rock-alkalic-intermediate rock，the post magmatic hydrothermal metasomatism，and the shallow phase-overflow facies magmatite niobium tantalum，rare earth，gold，iron ore formed.Based on the field investigation，the alkalic-intermediate rocks can be divided into alkali syenite diorite，alkali syenite porphyry，crooked long （albite） trachyte，trachyte tuff，and trachytic breccia lava.Field investigations and laboratory study suggest that the alkalic- intermediate rocks are subjected to intensive metasomatic alteration，mainly including sodium，potassium，silicification，aegirine petrochemical，biotitization，epidotization，chloritization and carbonatization.The Nb-bearing minerals comprise niobite，niobite bearing tantalum，euxenite，fergusunite，loparite determined by optical microscope and electron probe.Combined with all the observations，we propose columbium-tantalum mineralization can be divided into two stages：the early rock crystallization process and the late metasomatic alteration.In the stage 1，niobium and tantalum in the simple form into titanium pyroxene.Whilst，the titanium pyroxene was subjected to potassic alteration and the biotite，chlorite，epidote，ilmenite，magnetite，Nb iron ore，tantalum ore，rare-earth minerals formed.
The south of Xiahaoping gold deposit is regional faults and late Yanshan granite，and the west of Xiahaoping gold deposit is medium hydrothermal breccia pipe gold deposit of Dianfang.The developing of the gold deposit area are structure and vein rock.Mineralization geological condition is favorable.The rare earth element analysis results show that the sample has a high total amount of rare earth.The average value of rare earth ore is 207.7×10-6.LREE/HREE is from 6.81 to 14.19，which indicates that the light rare earth is enrich，and the light rare earth and the heavy rare earth are obvious difference.The δEu of gold ore is from 0.49 to 1.37，which changes in the between loss and enrichment of two endmembers.From Heyu multistage granite→Gold ore→Explosive breccia，the total amount of rare earth increases gradually，which implies that the influence of ore-forming hydrothermal fluids on magmatic rocks.The results of the trace element analysis show that sulfophilic elements are enrich highly，such as Au，Pb，Cd，Bi，Ag，Cu，As，Zn，which reflects the metallogenic environment of sulfur rich reduction.The characteristics of Pb isotope in pyrite show that the source of material is single，and isotope index is very close to period granite of Yanshan.Mineralization time of the deposit was 129±45 Ma，it is closed to the era of Heyu rock，which implies that there is a genetic relationship with granite.
This paper collects the patent data of rare earth luminescent materials from Thomson Reuters and Proquest Dialog and utilizes Thomson Data Analyzer，TI and INNOGRAPHY to analyze the patent data.Based on patent analysis，the current situation and development direction of rare earth luminescent materials are discussed and the technoloogy development direction and market arrangement of main countries in this field are analyzed，also compares technical distribution and direction，competitive structure，technique intensity and market strength.The results show that China lead the number of patents of rare earth luminescent materials，USA and Japan hold advantage in patent quality.In addition，the research and development direction about rare earth luminescent materials of China is single，but the cross-over study among the USA，Japan and Korea is existing extensively，such as glow-phosphor composition，scintillator composition，β-Sialon rare earth luminescent and nanometer rare earth luminescent material etc.Chinese enterprises should utilize the policy advantages of energy-saving lighting engineering and focus on high technology in this field，and should take the advantages of rare earth ore and enhance the research and development about rare earth luminescent materials related yttrium.
In order to investigate the impact of whole tailing characteristics of size grading on the performance of backfilling material，this study selected fractional dimension number and correlation coefficient of fractional dimension number to characterize the geometric features of whole tailing.By using cement-sand ratio，slurry concentration，fractional dimension number and correlation coefficient of fractional dimension number as the input factors，compressive strength，slump and bleeding rate as the output factors，a fractal-BP neural network model was constructed to predict the properties of backfilling material.Then data of 7 mines were calculated by the fractal dimension and correlation coefficient of fractal dimension，and the BP neural network was used for the training and prediction.The results showed that the finer the tailing，the bigger the size grading fractional dimension，but contrary to the pore fractal dimension.Furthermore，the fractional dimension of whole tailing is a little higher than grading tailing.The correlation coefficient of the grading tailing is between 0.71 to 0.97，which is more dispersed than that of whole tailing.The relative error is under 8% using fractal-BP neural network model to predict the properties of backfilling material.In a conclusion，the fractal-BP neural network model had a fine precision，which provides a new approach to predict the properties of filling material.
In order to optimize net parameters of holes by means of controlling the propagation of simulative blasting fracture with controlling variable method，the dynamic explicit software ANSYS/LS-DYNA is used to establish a numerical simulation model of the smooth blasting holes.The results show that：Induction-control hole in the holes net of the coping smooth blasting in roadway can not only induce the propagation of blasting fracture in orientation effectively，but also is beneficial to improve the ratio of smoothness in the wall of the roadway.In the smooth blasting of coping，tensile stress is obvious in the time-history curve of induction-control holes and beneficial to induce the propagation of blasting fracture.Also，the unloading stress state is expressed when induction-control hole is compressed in the key cell area.When the evolution-propagation curve is used as evaluation index，under the condition that the spacing of peripheral holes is 900 mm，the adaptability of smooth blasting is improved in these geological conditions with smooth wall.When an induction-control hole is set between two adjacent peripheral holes，the optimal blasting hole spacing is advised to be about 900 mm in engineering.
Regarding the problem of the misfire in deep hole blasting，which it is difficult to detect and identify，the frequency division multiple access misfire detection technology and system based on electromagnetic wave propagation theory is developed，meanwhile，the performance of the detection system is studied.The results show that with the lower transmitting frequency of electromagnetic signal in rock-soil body，the penetration ability will be stronger and the transmission distance will be farther.Based on the condition of same horizontal distance，the amplitude variation of electromagnetic signal decreases with the increase of buried depth of the misfire，it also decreases with the increase of emission frequency of the underground signal generator，and the attenuation tendency with the increase of emission frequency is more obvious.The system response more obvious to frequency in 2 012~5 025 Hz，it has a better recognition ability when the misfires are located in the depth less than or equal to 40 m and the distance less than or equal to 30 m.Frequency division multiple access misfire detection technology and system can be successed for the detection of misfire in deep hole blasting.
Deep orebody of Xiadian gold mine is located under high stress environment below goaf.In order to obtain a reasonable stoping sequence planning on the principle of underground pressure control，true three-dimensional digital deep orebody model was established by using 3Dmine-Midas/gts coupling method，measured in-situ stress was inverted，and secondary stress distribution rule in deep orebody was studied by Flac3D numerical simulation software.Based on mining environment reconstruction idea and feature of secondary stress，isolation layer project was proposed，of which parameters was determined by numerical simulation；4 feasible mining sequence schemes of alternate-forward，alternate-backward，continuous-forward and continuous-backward were proposed，the results show that the continuous-forward scheme is more advantageous to control underground pressure.As a result，the overall stoping sequence planing was determined，which provides guidance for safe and effective mining of deep ore orebody.
Mass vertical displacement collapsed in environment of complex mining stope always cause instability problems.By combining with the engineering practice of collapse in -320 m midway through the main orebody buckling in certain large lead and zinc underground mines，the three dimensional computer numerical program 3DEC was used to analyze the vertical displacement of stope filling body and around the degree，influence range and maximum shear stress distribution.It provides an important basis for the safe and efficient recovery of hidden resources and the determination of reasonable filling technology and mining methods.The results show that 0# ore body above the mined-out area overall sinking，the maximal sinking displacement is up to 2 m.The maximum shear strain increment region is mainly located in 0 # stope part，and eventually formed a U-shaped maximum shear strain increment through belt.The 0# stope collapse caused upper 0# stope ore body，mined-out area of N0-1#，N1-2#，S0-1#FU and S0-1# FU-1 located in the area above the slip surface，and N2-3# and S1-2# stope in the collapse edge.It is determined as the influence area of the collapse area.
The uniaxial creep test with step loading is carried out for the deep limestone，the axial and radial creep strain of different stress levels are obtained.Based on the test results，the change laws of axial creep strain，radial crcep strain and volumetric strain under different stress levels are analyzed.In addition to，the ratios of the axial and radial creep strain to the total strain are studied，which are defined as the ratio of creep effect Kz and Kh，and the difference between those is Kh-z.The study found that with the increase of the stress level，the axial creep strain and radial creep strain increase first and then decrease.When the constant stress is less than 51 MPa，the sample volume is compressed， Kh-z are within the scope of ±0.28%.It shows that the axial creep effect and radial creep effect are equal.However，if the stress is exceeded，the sample will expand and kz，kh increase rapidly，kh-z increased from 0.21% to 2.64%.It will reach peak value when the creep failure of specimen occurs.The results show that the radial creep effect is more obvious in the expansion stage，compared with the axial creep.The fitting effect is better by describing the characteristics of limestone axial creep with visco-elastoplastic model，and use the method of least squares curve fitting to get the creep model parameters，the average value of R2 is 0.931.
A low grade lead-zinc ore in Shandong Province was examined by XRD and SEM，the results showed that lead mineral exist mainly as cerusite and zinc minerals exist mainly as dolomite，smithsonite and willemite.The effect of grinding fineness on the recovery of lead and zinc was studied.At the optimal grinding fineness of 84%（-0.074 mm），the lead-zinc ore was treated by sodium sulfide，followed by butyl xanthate and ethyl dithio carbamate as combined collectors and terpenic oil as frother.As a result that the lead concentrate with recovery rate of 61.17% and grade of 57.11% was obtained.The lead tailing was treated with copper sulfate to activate zinc ore，followed by butyl xanthate as collector and terpenic oil as frother，the result showed that the zinc concentrate with recovery rate of 31.45% and grade of 35.24% was obtained，achieving a satisfactory separation result.Experimental results show that the effect of vulcanization is larger on the activation of dissociation lead oxide minerals，and a good recovery rate can be obtained under the condition of the best grinding fineness.
Abstract: In order to solve the problems of surface roughness and inaccuracy of orebody caused by the incompletion of modeling information or few data，a high quality 3D modeling method based on space contours was proposed.The specific modeling steps are as follows：First，according to the stratum properties and elevation to check consistency of space contours intersection and topology preprocessing.Then，the topology relationship between node and path network was built and the space gird of the spatial contours was extracted with the inner path first search algorithms.At last，the separate model for space grid was constructed by adopting the method of generation the transition contours，a complete surface model of the orebody was formed by seamless splicing the reconstructed space grid.The research results show that this method can simplify the operation of users，improve the efficiency of modeling，and surface model generated more realistic.
Determination of the optimal emergency escape route is the first step of safety and effective escape.According to the need of the actual emergency escape situation，defining the three hedge principle of mine fire，analyzing the safety factor of the passage and proposing the calculation method of the influence factor of travel speed，and then the optimization mathematical model of the escape route was constructed.According to the formula of equivalent length of roadway，convert the roadway network to the equivalent network diagram，on the basis of this network graph，the shortest path from personnel location point was solved by the Dijkstra algorithm thus ensure the safety and quick escape route.Finally，the model was applied to a metal mine in Yunnan Province，it provided reference and technical support for mine fire escape system.
Aiming at the problems of low atmospheric pressure，low boiling point，low dissolution rate of gold，low release rate of the plastic foam containing gold in thiourea solution at high altitude area，the determination results of plateau and plain areas were compared under the same conditions，and the effect of aqua regia concentration on the dissolution rate of gold was discussed.At the same time，the main influence factors of the determination results were compared，such as two ore dissolving methods，foam adsorption temperature，release method of foam plastics.The optimum conditions for determining gold at high altitude area were obtained through many experiments.The method has been varified by determination of national standard reference material，and the results are consistent with the standard values.The precision of the method is 2.85% to 4.37% with RSD（n=6），and the detection limit is 0.03 μg/mL.The method is suitable for gold analysis in geological samples at high altitude，it solves the technical problem of the determination of gold under low pressure environment in plateau area.
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