Dailong gold deposit is a micro-disseminated gold deposit discovered in recent years and it is formed in Xinduqiao Group during the Triassic Period.There are two gold orebodies and many mineralization orebodies，ore rock of which is mainly granite porphyry.The time relationship，spatial relationship and genetic relationship between dike and ore deposit and also granite porphyry characteristics are discussed，and the results show that magmatic activity provides not only heat energy but also ore-forming materials and ore rock during the process of gold mineralization.Granite dike is an advantageous position which is an important symbol of prospecting in this area，it helps to improve the efficiency of prospecting and to expand mining area.
Due to the tertiary and quaternary strata overlay thickness on the surface of Zhaishang gold mine，it is difficult to position the deep orebody and surface prospecting.According to current situation of exploration，a good deal of work Controlled Source Audio-frequency Magnetotelluric measurements were carried out.In addition，through CSAMT survey work at 16 lines in north and south ore belt，the results showed that there were significant differences between the north and the south mining area in resistivity.Through analyzing resistivity two-dimensional inversion of the 16 lines，it was found that Zhaimashu anticline displayed north step south slow，and a vertical form at karyomere.Broken alteration zone（orebody） was located in the high and low resistivity anomaly gradient belt，suggesting that there were 10 broken alteration zone，south and north ore belt each has 5 broken alteration zones，and the known structural belt and vein distribution sets was better.We completed the resistivity measurement at south ore belt area of the gold mine，43~95 line CSAMT joint profile measurement showed that the deep veins were larger prospecting space.The 35 series in Zhamashu arch core overall exhibited north dipping with abnormal current larger depth，and the deep prospecting was potential.In general，controlled source audio-frequency magnetotelluric measurements can solve the problem of structure distribution，explore the south and north ore zone of deep vein distribution at the gold mine，which provides a theoretical basis for deep exploration.
Linglong gold deposit and Jiaojia gold deposit are large gold fields in Jiaodong region.In addition，the Linglong gold field is given priority to with quartz vein type gold deposits and the Jiaojia gold field presents altered rock type gold deposit.Based on a brief overview of regional tectonic background，the two giant ore deposits metallogenic structure were analyzed with emphasis on discussing metallogenic ore-controlling role of Guojiadian mantle branch structure to the two types of ore deposit.The results demonstrated that peripheral detachment beltthe of Guojiadian mantle branch structure developed a series of ductile-brittle shear zone controlling distribution of the two types of ore deposits，while the mineralization type was controlled by the location of the fracture structure and structural properties.Mantle branch structure theory reported that the Jiaodong gold ore-forming material came from the deep.On the basis of the theory，ore body distribution，extension and alteration features of the Linglong and Jiaojia mining area were investigated.Meanwhile，we analyzed the mineralization and speculated deep prospecting direction.
This paper studies Sr，Nd，Pb，isotopic compositions of 7 granitoids from South Qinling，which were all formed about 200 Ma B.P.The results indicate that the granitic rocks including the Baimashan rock mass from the South Qinling are characterized by low radiogenic Pb isotopic composition.Their initial（87Sr/86Sr）t ratios range from 0.70495 to 0.70908，εNd（t） values from -2.40 to -8.55，and Nd isotopic model ages（TDM） from 1.2 Ga to 1.7 Ga.their εNd（t） values gradually decrease from east to west，whereas TDM values gradualy increase.The Baimashan rock mass has much lower （87Sr/86Sr）t （0.70637），lower εNd（t）（-6.75） and much higher TDM（1.53 Ga）.This study reveals that the magmatic source of the Baimashan rock mass was derived from the deep continental crust.In the magmatic source，basic magmatic material in the crust similar to the Yaolinghe Group basic volcanic rocks in South Qinling，is the major source for the formation of granitoids with less significant old continental crust material.The Baimashan adakite which is in favor of copper and gold mineralization，may resulted from partial melting of mafic lower crust in the thickened lower crust due to the lithospheric delamination and the asthenospheric upwelling，which can provide some clues to the direct copper-gold prospecting.
India’s gold mine has four basic types：greenstone belt type，conglomerate-type，alluvial gold mine and associated gold mine.India’s gold mine has a feature of wide distribution，relative concentration，less large and rich mineral deposits，and the great depth and so on.Greenstone type gold mine which is the most important gold type in India，concentrates Precambrian greenstone belt in South India craton and central India craton.Kolar gold mine and Hutii gold mine in the East of Darwar craton in south India are typical greenstone type gold mines. Kolar gold mine is a super-giant gold deposit with an average gold grade of 16 g/t，and gold reserves > 1 000 t；Hutti gold mine is a large gold deposit with an average grade of 4.85 g/t，and gold reserves >150 t.The proved reserves of India’s gold mine is very limited，but a lot of smaller gold deposits are widely distributed in India craton greenstone belts，which indicates there is a very good potential of gold resource.Increasing the investment in the exploration and development of India’s gold mine will make more gold resources with great value be discovered and may also completely change the status quo of India gold.
Baizhuping gold deposit is located in the west of Baimashan-Longshan uplift belt in central Hunan Province.Ore formation of the deposits are Gaojian Group Tianjing Formation，Sinian Jiangkou Group Changtan set.7 ore-veins which strictly controlled by the fracture zone has been found in the deposit.Gold elements of gold ore mainly exists in the form of native gold.A small amount of microscopic gold in the form of machinery foreign substance or micro-inclusions existed in minerals such as pyrite，arsenopyrite and chalcopyrite.Wall rock alteration is given priority to with silicification，pyritization，times of arsenopyrite，chalcopyrite，chloritization，and sericitization，clay and so on.Wall rock alteration has the phenomenon of zoning.Based on the studies of Baizhuping gold mine geological characteristics，mineralization enrichment regularity of gold deposits，etc.，the ore-prospecting marks were summarized.
As one of the world’s most widely used drawing platform in engineering and research field currently，AutoCAD software has the significant value in mining field.In order to improve the function and application value of 3D Modeling Visualized Integrated System of Goaf which was developed independently，CAD data interface of the integrated system was developed on the basis of researching the data storage structure of dxf file used universally by CAD and summarizing the data storage rule of different graphic elements.Through the interface，the data in dxf file about goaf’s point cloud model，profile and triangular mesh entity model could be read by integrated system.At the same time，the dxf files about goaf’s point cloud model，profile，and triangular mesh entity model could be generated automatically.CAD Data Interface effective development methods was presented，data storage structures of different graphic dxf file was parsed，store law of different data elements in the dxf file was summarized.The practical application showed that data sharing between the integrated system and AutoCAD was well realized through this interface，so great conveniences could be brought in the work surrounding goaf，like relevant mining design.And this achievement can provide useful reference to research on the CAD interface.
The characteristics of the influence factors for the stability of mine tailings dam is complex variabily，uncertain and nonlinear.For the purpose of guaranteeing the stability of the tailings and preventing mine tailings dam accident effectively，an analysis model of the stability for mine tailings dam based on PCA-BP neural network is established.The original data from multiple mine tailings dam instability instance is standardized to determine the principle component by using SPSS software，then we use the principle component as a BP input sample to train simulation by using MATLAB software.The data shows that preprocessing the original sample by using PCA algorithm before the BP training can effectively improve the training speed and precision，the PCA-BP neural network model is feasible in the analysis of the stability for mine tailings dam.
In the process of geological exploration，due to the limitation of technical and equipment objective conditions，there are lots of basic geological data missing.It causes that the geological data is not complete and accurate as building the deposit model，and has a direct impact on the accuracy of the orebody shape and reserves estimation.In order to provide the complete and believable data，so that the deposit model will be more realistic.Firstly the generation mechanism of geological missing data is studied to find out the method which geological missing data obeys.By means of comparing and analyzing the features and applicable conditions of Expectation Maximization（EM） algorithm，Markov Chain Monte Carlo（MCMC） method and Back Propagation（BP） Neural Network，then an interpolation method of geological missing data which based on BP neural network is selected and introduced，and the relative model of processing geological missing data is built up.Finally the whole method is applied in a certain gold mine in Shandong.It has been proved that the model can achieve interpolation of most of the geological missing data，and the results are reliable.In short，it is feasible and effective using the model to solve the integrity problem of geological data caused by basic data missing.
The Gravity-flowed Convey of high-density whole tailing is already widely applied as time goes on and distributed around the globe in metal mine.A detailed numerical simulation study was conducted of a pipeline transportation of high-density whole tailing of iron ore，and based on high-density whole tailing slurry，main physical parameters are defined and the construction of the numerical model of the pipeline transportation of high-density whole tailing cemented filling slurry was also completed at the same time.Depend on the application of ANSYS/FLOTRAN，we will simulate the dynamic feature of high-density whole tailing slurry when it works in the pipeline，and also conducted a comparative analysis between the simulated result and the theoretical value.At the same time，the numerical calculation of transportation of slurry was also conducted and studies the result of the calculation.The slurry whose concentration is between 68% and 78% will achieve Gravity-flowed Convey by the intake velocity of 1.5 m/s，2.0 m/s and 2.5 m/s.When it comes to the simulated result and the theoretical calculation，we find resistance loss of both are almost unanimous.With the initial velocity of slurry increasing，the impact force coming from the concentration of slurry is becoming lighter and lighter at the same time.At last，we can conclude that the numerical model is reasonable and practicable，and this review would provide a theoretical guide for the application of Gravity-flowed Convey of high-density whole tailing cemented filling slurry.
For the sake of covering the shortages for neural network in risk evaluation and eliminating human error and subjective grounds，principal component analysis in statistic and BP neural network were combined and used to constructing the invalidate risk evaluation model of backfill pipe，which couple with a large amount of relative data of mine’s backfill pipe system.The investigations found that the input dimension of neural network were reduced and the relationship of all the indexes were also eliminated through dealing with the original data by means of PCA method，and the contrast of optimized BP neural network and standard BP neural network without principal components analysis turned out the former has outstanding merits of rapid analysis and high accuracy in predicting，meanwhile，the rationality of the model was certified according to the results from simulation test.
In order to identify the optimal mining mode，based on the improved unascertained measurement theory，indexes of environment，engineering，economics were taken into account，an unascertained measurement model was established.The model considering the influence factors of mining mode，according to the fact， analyzing with qualitative and quantitative methods，introduced the game theory model to calculate comprehensive index weight of each factor.It reduced the subjective influence on the evaluation results of the part while the experts’experience was adopted.The evaluation results could be obtained with the credible degree criteria.Combining with an instance of a domestic mine，the mining mode was evaluated with the use of the unascer- tained measure theory.Research results shown that the evaluation level of the mine was Ⅱ，that was consistent with the fact.
In order to improve the reliability of gold measurement，taking Evaluation and Guidance of Measurement Uncertainty as a guide，we systematically analyzed uncertainty on determination of gold in gold ore by atomic absorption spectrophotometry after activated carbon adsorption.Analyzed on sources of uncertainty was carried out in this article，including weighing mass of the sample，calibration solution preparation of gold，volume of the sample solution，calibration curve fitting，measurement repeatability and so on.The components of measurement uncertainty were used to establish mathematical model to determine primary factor of measurement uncertainty，and combined standard uncertainty and expanded uncertainty are evaluated.The combined standard uncertainty the expanded uncertainty is 0.52 g/t and 1.04 g/t respectively.It showed that weighing mass of the sample has the most significant effect on relative standard uncertainty.
In order to solve effective connection between the library and the national standard for the MapGIS system for reasonable，improve the efficiency of practical application，based on the regional geological map illustration national standards，we introduced how to combine closely with the current standard，system libraries and application system from three aspects of the research status of specification，system libraries method call and practical application，finally the paper solved the problems of connection among them in the application.Overall，the results had practical significance not only for optimizing the application of system libraries and improving the efficiency of the application of the system library，but for the geographic information system upgrade complete，additionally it has important guiding significance for complementing system library.
In order to develop and utilize mineral resources in gossan type gold and silver ores，cyanide leaching was applied to study the gossan type gold and silver ores in Qinghai Province.We investigated the effect of grinding fineness，leaching time，pulp density，dosage of sodium cyanide，lime and lead acetate to leaching rate for gold and silver，finally the optimum leaching condition was determined.The results showed that grinding fineness of -0.074 mm accounted for 98.23%，pulp density around 33.33%，lime dosage of 10 kg/t，the dosage of sodium cyanide of 2.5 kg/t，lead acetate of 100 g/t，and under the leaching time of 24 h，the leaching rate of gold and silver was above 93% and 83%，respectively.The results provided technical support for the development and utilization of gossan type gold silver ores in Qinghai Province，and it is of great significance for the efficient development of the same kind of resource.
The thesis focuses on research of the micro-disseminated gold ore.Explored the extraction effects，under the condition of wet milling，with non-cyanide leaching agent，pre-treating with lime and sodium carbonate，mixed system is more efficiency than single pretreatment system，which may influenced by the generation of sodium hydroxide.The reaction of sodium hydroxide with quartz and pyrite make the package gold exposed，which is beneficial to the leaching of gold.When inflating in the pretreatment and leaching process，leaching effect is better.This may be oxygen participate in the reaction or reduce the thickness of the diffusion layer and solid film thickness.The results showed that under the conditions of lime dosage was 50 kg/t，sodium carbonate dosage was 2 kg/t，pretreatment time was 4 h，a non-cyanide leaching agent was 10 kg/t，leaching time was 14 h，liquid-to-solid ratio was 3∶1，inflatable amounts was about 0.5 m3/h，the gold leaching rate of 86.09% was achieved.
Furnace burden is chemically complex in the chloride metallurgy process.Complex components of furnace burden can corrode or adhere to refractory material，which reduces the working life of refractory material and then has a strong impact on the industrialization of chloridizing-roasting gold-extracting process.Small chunks of four kinds of common firebrick were put in the furnace burden and roast.Through analyzing the phases of contact surface the high temperature surface corrosion properties caused by minerals containing CaCl2 were found.It suggests that firebricks which contain more Al2O3 are not adhesive to furnace burden，and they are chemical stable in that condition.Firebricks which contain more SiO2 will react with Ca at 1 200 ℃.The furnace burden clings to high Al2O3 content firebricks because iron oxides can be solid dissolved in Al2O3 and materials of low melting point are generated at 1 250 ℃.The content of Fe2O3 which is solid dissolved in Al2O3 increases with rising temperature.Iron enrichment of high Al2O3 content firebricks is more obvious at 1 300 ℃.
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