In order to determine reasonable stope parameters and mining sequence which purpose is to increase the safety of mining the panel isolated pillar of deep well，and in view of the defects of the traditional methods do not consider the interaction between evaluation factors and do static analysis only，based on λ fuzzy measure and Choquet integral，a new idea of dynamic comprehensive evaluation method was put forward to select mining scheme.According to the engineering practice of 52# isolated pillar in Dongguashan copper deposit，four kinds of mining schemes was put forward，and five evaluation factors which influencing the mining scheme selection were determined，that is the maximum main stress of sidewall，the maximum main stress of end wall，the maximum horizontal displacement of lateral wall，the maximum vertical displacement of roof and the plastic zone size，and the initial datas of evaluation were obtained by means of coupling modeling between MIDAS/GTS and FLAC3D，and the integrated superior degree of each scheme was calculated when interactivity degree is -0.99，-0.5，0，1 and 10 respectively.Finally，by comparing the integrated superior degree the optimal extraction scheme was determined，which is stoping from thick to thin，the length of each extraction unit from G1 to G7 is 36，34，34，52，70，70，70 m，side wall and end wall reserve 2～4 m thick pillar，alternating backfill after mining.
In order to reduce the loss of underground resources，improve the economic benefit of mine and the safety of production environment，the“three under” mining is paid more attention.According to the “three under” mining exploitation in Jinkouling mining section as the engineering background，using finite difference software FLAC3D to build the numerical model of mining，and then study the sublevel open stopping with subsequent mining structure parameters influence on the stope stability of surrounding rock and the deformation of the ground surface.The results show that it is not conductive to the maintenance of stope stability and control the deformation of the ground surface，if the panel length is too large and the thickness of top column and column width is too small.Considering the analysis results and the actual mining，reasonable economic situation，the panel length is 60 meters，top pillar thickness is 7 meters and inter column width is 8 meters for the optimal structure parameters，which can effectively maintain the stability of stope surrounding rock，but also can control the surface deformation，providing a certain reference significance for actual mining.
In order to carry out more efficient design of mining and to calculate ore yield，mining loss rate，ore grade，and metal yield more quickly，DIMINE mining platform is used in this paper.This software could help in optimizing the design of the plug-mining unit layout into multi-program and improving the limitation and simple of traditional two-dimensional layout.Then the mining unit multi-scheme can be obtained quickly in needs of the actual situation and the economic and technical indicators can be calculated with one button.Fengtaishan orebody is optimized systematically with this software，mining unit layout plan can be developed more rapidly，economic and technical index can be exported and printed in one key.The results show that the proposed multiple design brings obvious economic benefit to mine production.
Phapon gold mine locates in the middle of the Luang Prabang island arc belt，which is the south part of Sanjiang ore cluster area in China.It is controlled by structures and the orebody occurs in the Carboniferous- Lower Permian marine carbonate strata.Rare metal mineral in the ore，and gangue mineral is given priority to with calcite，the deposit is a less sulfide type middle-low temperature hydrothermal deposit.Through field investigation，combining previous research results，we analyse and study the structure characteristics and ore-controlling role of the region and mining area.Researches show that the NW Luang Prabang arc fault controls regional structural framework，the secondary parallel F5 ductile-brittle shear belt controls the distribution of stratigraphic，mineralization and alteration and geochemical anomalies，the secondary syntropy F1 and F2 ductile-brittle shear belt controls the distribution of stratum and gold belt；the derived structure NNW tensional-shear faults controls the mineralization and alteration belting，position and output of gold ore body.Intersections of mineralization structure is advantageous position.As an important symbols，with stratum and mineralization and alteration，structure is used to guide peripheral ore prospecting.
Located in Western Junggar area，Hatu gold mine is the largest gold mine in Xinjiang Autonomous Region，China.In the past years，a large number of geological data were gathered and stored.In the relevant material，the three large faults，Hatu，Anqi and Daerbute are called minerogenetic structure，ore controlling structure，or conducting structure in almost all the relevant geological data.However，the author affirms that actually there is no gold mineralization，alteration phenomenon and occurrence of gold orebody in those faults.The breccia，crushed rock，schistose and other materials in the fault zone has experienced strong compression.The gold in the fault zone was not mineralized or altered and the existence of the gold ore is merely the result of mineralization of fault tectonic.The previous researchers have made these mistakes，including mis-clipping or displacing the Hatu gold belt，which has made things more complicated.Based on the occurrence and offsetting conditions of those three mineralization faults’ structure，the gold belt’s original state was restored，which proved that the Hatu gold belt’s original state is a large wedge ore body that trends NEE，NNW direction，extending about 70 km SN and more than 100 km EW.In the late period it was truncated and offset by the large faults Hatu，and Anqi belts.These interactions have made Hatu gold belt form the imbricated structure and NEE，NNW direction.According to this general structural pattern，the author can scientifically guide and predict the direction and scheme of mineralization，the prospecting of each gold deposit and ore spots of the Hatu gold belt.To be more specific，the author found out that the center of wedge ore body，with Hatu gold deposit（or a little inclined to east） which belongs to Western Gold Group as its center，has maximum single layer thickness and higher grade，with the best prospecting and mining prospects，lying in the center of the original large wedge-shape ore；the author also found out that the south Daerbute ore belt especially the eastern area which is on the topside of the wedge ore body，has the gold veins in small and medium size and with a larger number，there fore more small and medium-sized mines should be prospected；the author found out that the northern Hatu belt locates on the lowermost portion of the wedge ore body，and the veins are fewer and poor，therefore the prospecting potential and hope is little.
Huaishuping gold deposit is a new large gold deposit discovered in western Xionger mountain and Waifang mountain，orebody occurrence in Xionger Group of Jidanping Formation in intermediate-acid volcanic rock，while in accord with andesite surrounding rock.Summarizing axial primary halo zoning laws would be helpful to the prospective predict of deep deposit metallogenic and regional prospecting.Through primary halo zoning calculating and multivariate statistical analysis of the main ore body samples，we come to the results that primary halos of K23 ore body zoning sequence from top to bottom is Cu-Mo-Au-Bi-Pb-Hg-W-As-Ag-Sb-Zn，the element of front halo and tail halo is superimposed，primary halos of K23 have the character of inverse zoning，speculate the possibility of exists deep blind ore bodies；K24 ore body consists of several small end-to-end alignment ore body in the same phase，primary halos of K24 ore body zoning sequence from top to bottom is Sb-Au-Ag- Bi-Mo-Hg-As-Pb-Cu-W-Zn，it is not obvious elements of primary halos superposition phenomenon，and constitute a complete normal axial zoning relatively.There are still prospecting space to deep deposit.The zoning sequence have reference meaning looking for the same type deposits on the area.
The structure of rock formation in Wuxu ore-concentrated area likes“sandwich” without the exposed magmatic rocks， ore body is located in the middle of “sandwich”which is mudstone layer.Characteristics of construction of vein and the distribution of veins flat surface and section in Jianzhupo deposit of Wuxu ore field is analyzed and the results show that the ore body is formed in brittle-ductile thrust shear zone in the early phase of Indo-Chinese epoch.Orebody sank in the shape of echelon deeply， thenitwasreformedbytheWuxufaultpropagation fold in the late phase of Indo-Chinese epoch afterwards and SN fold in the phase of Yanshanian， at last its strike is NNWanddistributionlookslikepositively“eight” Chinesecharactersinthesection.The late reformation make sore body attitude of westwing and the core department of anticline uprightly，and ore body of westwing sinking from SW to NE deeply.It’ scontrolled directly by the distribution of right/lefte chelon vein in the early indosinian brittle-ductilethrustshearzone.Itconcludesthattherockstratahavea “sandwich” intheNandan-Hechimetallogenicbelt， arelikely tooccurbrittle-ductileshearbeltwhichcontrolveinorebody.
Songshan is one of the typical area where the Neoarchean TTG rocks are well exposed.Neoarchean TTG rocks in Mazhuang which are mainly distributed in Songshan with the features of grayish-white colour，medium-grained structure，gneissic and banded structure.Geochemical study shows that Mazhuang TTG rocks are featured with high concentration of Na2O（4.34%～6.49%） and SiO2（＞69.24%），poor in iron and magnesium，and with high Na2O/K2O （2.0～3.2） ratio.The average content of Al2O3 is 16.51%（>15%，its range is 14.35%～17.68%），this phenomenon shows the characteristics of TTG gneiss with weak peraluminous.Trace elements analysis indicates that ΣREE is 11.57×10-6～30.94×10-6，depleted in HREE，with strong differentiation in LREE and HREE.Eu positive abnormality is obviously，high contents of Sr and Sr/Y ratio，low contents of Cr，Yb and Y，reflect that it has the similar geochemical characteristics with high silicon adakite in Cenozoic era.The formation environment of Mazhuang TTG rocks is similar with island arc volcano rock according to the environment discrimination diagram of trace element geochemical.It is concluded that Mazhuang TTG rock mass is formed by the partial melting of subducted oceanic crust which is aqueous basaltic under the high pressure.
In order to organize the abundance information on synthetic metallogenic prediction more scientifically，improve the reliability of metallogenic prediction，lower the investment risk in mineral exploration，in this study，we took the ore-forming system as the frame and metallogenic prediction as the clue，summarized different influencing factors in ore-forming and metallogenic prediction，and combined these influencing factors with the term of matter field，energy field and information field.Based on analysis of the constitution，construction and property of each field，we introduced the synthetic metallogenic prediction model.Then，the developed model was utilized to multi-metal-barite ore for metallogenic prediction in western part of Dayaoshan mine in Guangxi Province，and we assessed and analyzed the results of synthetic prediction model.In the present work，we linked matter and energy in the metallogenic system with information in metallogenic prediction and mentioned the concept of field，which could be helpful and important for metallogenic prediction in the future.
Jinshan gold deposit is located in the south of Qixia-Penglai orogenic belt，central of Jiaodong Peninsula，which belongs to altered rocks gold ore deposit that controlled by structure in crushed zone.The Jinshan gold deposit has reached medium scale and become the major breakthrough of the region under the work of geology exploration in recent years.A summary of mineralization characteristics and pattern in the region would have great help in the further geological prospecting work.In this paper，we collect the geologic characteristics of gold ore deposits in this area and make a system summary with the help of previous geological data and the latest exploration achievements，then we do some preliminary discussion of the genesis of these gold deposits；combined with the regional and field geological facts，the geological and geochemical models of ore prospecting have been initial established，at the same time forecast in the gold mineralization was conducted，which could provide reference in ore prospecting in this area or even in the whole region.
The key factors which influence stability of access road roof in access back-filling of horizontal pillar in loose medium are coping thickness and roof-contacted area.In order to solve these security risks and achieve the maximum amount of ore recovery，the deformation characteristics and failure mode of backfill roof have been studied by similar material simulation of three methods roof structure of pile groups，sole beam and arch beam based on -240 m horizonal pillar in Fenghuangshan mine.The result indicates that sole beam has the maximum critical roof safety thickness and arch beam has the minimum one，instability of sole beam and pile groups is caused by snipping subsidence from both sides and instability of arch beam is caused by folded damage in the middle.Stability of roof of access road can be improved by effective instability control technique，roof instability usually happens during accelerating creep stage，pile-arch beam structure is put forward as an effective instability control technique.
Accurate geological model is determinant to the stability numerical analysis reliability of open-pit slope engineering.Due to the complexity and irregularity of intersections between geological bodies，the authors study the generation technology of free-form surface based on NURBS （Non-Uniform Rational B-Spline）.Taking 2D geological exploration sections which are widely adopted in mining engineering as basic data and processing them by means of vectorization，the discrete points on the boundary of rock and soil mass are extracted，and then NURBS demarcation surfaces between geological bodies are built.Based on that，the corresponding implementing scheme of 3D visualization and numerical model of complicated geological structure in slope engineering on the platform of MIDAS software is made.The modeling method mentioned above is applied to the slope engineering of Chengmenshan open-pit mine in Jiangxi Province as an example.Practice shows that the method building complicated geological body model of slope engineering by using NURBS technology is simple and reliable and could greatly improve the model precision and modeling efficiency，not only representing the complicated geological bodies vividly，but also providing reliable finite element numerical model for the stability analysis of open-pit slope engineering.
Due to the unreasonable ball diameter and proportion of the MQG3660 grid-type ball mill in a gold mine，some of improved measures were conducted in this study.The ball diameter was calculated based on ball diameter semi-theory formula，and the grinding comparative experiments on different ball charge characteristics were accomplished. Finally，the best initial installation ball diameter and proportion（m（Φ80）∶m（Φ70）∶m（Φ60）∶m（Φ40）=10∶20∶30∶40） and adding ball diameter and proportion（m（Φ80）∶m（Φ70）∶m（Φ60）∶m（Φ40）=10∶20∶30∶40） were achieved.The results of industrial test showed that the capacity of grinding increased by 3.36 t·h-1，and metal consumption and power consumption reduced by 15.57% and 9.85%，respectively.Obviously，the goal of increase production，energy saving and low metal waste was achieved by optimizing the ball charge characteristics in the present work.
In order to improve the efficiency of underground mine’s transportation，the running route and distance of electric locomotive must be considered for comprehensive analysis.Under the premise of considering the transportation task of every-shift，a multi-objective route optimization model was proposed with the total amount and the total haul distance of electric locomotive as the optimization goal.The NSGA-II is a commonly used algorithm to solve the problem of multi-objective optimization，it was applied to optimize the route of underground mine’s transportation for the first time，and MATLAB software was used for emulating the solving process.The results show that the best transportation route is quickly gotten by using this method， and it provides basis and assurance for the route arrangement of mine’s transportation.Taking a copper mine in Yunnan Province as an example，the total amount is 1 348.4 t·km and the total haul distance is 2 995.7 m when in the best transportation route.
Mining equipment selection has important influence on the production capacity and economic benefit of the underground metal mines.It is an important subject for the mining production efficiently to realize the optimal combination of mining equipment.Pursuit the optimization about the coordination optimal-decision of batching-systematic drilling，loading and transportation equipment，according to the productivity of the mine，making the efficiency index as the limitation，making references from the thought of overall planning，using the Analytica software based on Bayesian decisions and kernel judgments models creatively，coupling with the static system calculation and catastrophe theory to push the single-point calculation with high precision into cross-fuzzy multi-point calculation，and then blending the multi-choose mechanisms to the model and analysis the process and selection of concrete mine example to get the optimization of mining equipment selection which is also the close combination of engineering state to realize the optimal decision of mining equipment systems in the cloud platform preliminarily by being combined with checking calculation for the application to provide a new idea for the preferred choice of multi-subject systems in the large data mining.
Compared with common flotation，the productivity of flash flotation is better，which will improve metal recovery rate of metal with large specific gravity and nonferrous metallic ores with uneven dissemination size，reduce the mineral overgrinding and improve flotation rate with less flotation reagents.Flash flotation is used to remake flotation progress in a gold concentrator in Gansu Province to reduce metal loss caused by mineral overgrinding and mineral changing.This new progress raises daily mining capacity by 120 t，raises ore recovery rate by 4.61%，technical index and economic benefit is also improved，and it gives references for other similar concentrators.
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