Gold deposit is an extending part of metallogenic belt in Sanshandao northern sea area.Where and how to find the gold deposit have been an important problem that troubled marine prospecting for achieve breakthrough.To carry out a systematic exploration activity from the reconnaissance to general exploration directly based on the comprehensive analysis of the metallogenic regularity，orebody spatial distribution，enrichment regularities and forecasting prospecting potential.The assembling pitching of pile offshore drilling platforms are used in the exploration characterized with safe and stable，strong operability，short cycle，construction of deep hole and good quality.After two and a half years of exploration，the largest gold deposit and the largest gold ore body in China are presented.It is the pioneer in the gold exploration in shallow sea area，solving the technical problems in the gold exploration in the sea，creating a precedent for the gold exploration in the sea，overcoming the problem of the exploration difficulties in the sea area，broadening the research on the metallogenic regularity of Jiaodong gold deposit and the application of the new method for prospecting.It has certain reference significance and exploration demonstration effect to the solid mineral exploration in the future in our country.
Based on the hydrogeological survey，hydrogeological drilling，borehole integrated hydrological logging，drilling and pumping tests，combined with regional geological，hydrological and meteorological data，the basic identification of hydrogeological conditions in the mining area was conducted.Mainly containing water rock layer in the area was divided to the Quaternary loose rock pore aquifer，granite weathering fracture aquifer and structural fracture rock cranny aquifer.Direct factors of the mine water filling is the structural fissure water and indirect factors are weathering fissure water and Quaternary pore water in loose rock.The analogy，big well method and horizontal corridor were used in mine water filling forecast.Except the analogy method which with larger result，the calculated results of big well method and horizontal corridor are very close，indicating that the method and data is reasonable in this work，also providing indirect proof that the infiltration parameters analysis is reasonable.
With the gold exploration in the northern sea area of Sanshandao，the amount of offshore drill working reached 120 thousand meters which was significance to solid mineral drilling.The construction of offshore drilling could hardly do with the offshore drilling platform.In view of the engineering actual situation， the simple offshore drilling platforms were used which developed by ourselves.With the drilling technology including hole structure， drilling fluid and so on and a series of drilling quality assurance measures，a whole technical solution applicable to offshore solid mineral exploration drilling engineering was formed that ensured the smooth operation of the drilling engineering.A large number of geological offshore drilling finished while the maximum boring depth was 1 973.46 meters. At the same time，it could provide technical reference to the similar offshore drilling projects.
As one volcanic-hosted deposit，the Kalagailei copper deposit in Xinjiang is hosted in Dahalajunshan Formation volcanics of Lower Carboniferous.Orebodies occur in a breccias pipe，silicified rocks and altered tuff with well-developed schistosity.Combined with previous research on the morphological characteristics of the hidden breccia，rock facies characteristics and the control action zonation and mineralization were analyzed.It is manifested that breccia pipe dipping south is controlled by regional ductile shear zone，circular structure and secondary faults，and mainly composed of brecciaed felsite.No.5 ore body is hosted within explosive breccia pipe，and its zonation，shape，attitude and size are controlled by the breccia pipe.Mineralization displays clear zonation with Au，Pb，Zn enrichment at upper and Co，Au enrichment at lower.Other orebodies，mineralization zoning and alteration zoning are also controlled by the breccia pipe.Consequently，breccias pipe and its related alteration such as silicification，tourmaline alteration，chloritization and carbonitization are the significant index for prospecting of subvolcanic ore deposits hosted in breccia pipe.These index can be used as an important guide for prospecting in its periphery.
Zhakailongba locates in Hoh Xil-South Bayan Har mountain （gold，antimony，tungsten，tin，rare metal） metallogenic belt，which has superior ore-forming geological condition for gold and antimony ore.According to the advance survey of the gold deposits and attaching regional geological data，metallogenic condition of gold ore in Zhakailongba district is analyzed through the following aspects such as strata，structure，magmatism，metamorphism，geochemical exploration anomaly and so on，and the results show that the development sectons of Qingshuihe Formation（Triassic），secondary fault zone parallolled with regional NW-SE trending deep fault，quartz vein and Au，As，Sb multi-element combination anomaly are favorable mineralization site，this indicates that Zhakailongba area has a good prospects for gold ore.In order to make breakthrough in exploration of gold ore in Zhakailongba area，regional geology and geochemical exploration data should be fully used in future geological exploration，combined with adjustment of working area，and exploration of gold ore in Dela river basin must also be strengthened.
The K2 oreboby in Xiahaoping gold deposit is controlled by the ring-shaped structure of the edge of Dianfang cryptoexplosion breccia，Xiahaoping K2 deposit behaves the features of magmatic hydrothermal solution.The primary halo feature research of the orebody shows that Au，Ag，Cu，Pb，Zn has good correlation with each other，but the correlation of W，Mo and other elements is poor.Factor analysis reflects characteristics of superposition of multiple metallogenetic superimposition during the ore-forming process.It is calculated that axial element zoning of the primary halos of this deposit is Mo-Au-Cu-As-Bi-W-Ag-Sb-Zn-Pb from top to bottom，there are characteristics of reversed axial zonality with the element of front halo and tail halo superimposed.Results show that the zoning pattern of this K2 orebody is that silver locates under gold，therefore，we predict that it has good metallogenic potential of silver under 478 m elevation.
Dayaoshan region is one of the famous gold metallogenic belts in Guangxi Province and the gold reserve has an important position.The metallogenic geological condition is good.There are many gold points in this area and nearly 150 medium or small gold deposits （points） have been found.Based on the previous research，we summarized the geological characteristics and genesis of typical gold deposits in Dayaoshan and discussed the geological characteristics and genesis of Renhou gold deposit.Renhou gold deposit is a newly founded deposit in Dayaoshan area.It has the characteristics of quartz vein type deposit.There is no magmatite exposed in Renhou area.The stratum is mainly Xiaoneichong Group of Cambrian.The structure in this area is mainly NE and EW direction.The type of Renhou gold deposit is low temperature hydrothermal gold deposit.The ore body is mainly in the fractured zone and quartz vein.By comparing the geological characteristics and genesis of Renhou gold deposit and gold deposits in Dayaoshan，it is proposed to find the broken belt type gold deposit in the prospecting ideas.
The study area is located at the join position between the eastern Kunlun and the West Qinling，which experiences a complex tectonic evolution，consists of the Lower Triassic Longwuhe Group strata mainly，and outcrop mediate-acidic magmatic rocks，but the tungsten mineralization did not been discovered before.The Xianlonggou antimony-gold deposit and the Jiawu gold deposit have been discovered un the area，it displays a good geological metallogenic condition.The primary data of 1∶50 000 stream sediments suggest that it enriches the W，Au，Ag，As and Sb elements in the area.Analyzing the geological and geochemical characteristics and the regional metallogenic conditions，combining with the actual prospecting work，all these indicate that the Xiaoqurugou-Jiarihai mine has better tungsten-forming potential.As mentioned above，we propose that the tungsten anomalies are the first precondition and the favorable object for the tungsten prospecting，which is predominated by the alteration rock and quartz vein type mineralization，the medium-thin sandstones and the thin sandstone inter-layers within slate，which belong to the second rock department of the Longwuhe Group.
The gold polymetallic deposit at fourteen section region located at middle part of the Zhangguangcailing- Taipingling edge uplift belt.It was found that the volcano-magmatic activity was frequent in the area，together with structure development and good ore-forming geological conditions.Through 1∶50 000 stream sediment survey work in the study area，approximately 205 ingle element anomalies of stream sediments were identified，additionally，26 combination anomalies of stream sediments were also defined and these include the Hs-18 combination anomalies.In order to search for gold dominated polymetallic ore at the fourteen section area，verification work was carried out at the Hs-18 combination anomalies.The methods applied in this study including 1∶20 000 soil measurement，1∶20 000 geological detection，1∶2 000 high-precision magnetic measurement，IP ladder measurement and methods of trenching.Finally，we defined 89 single element anomalies for soil，8 combination anomalies，one low grade gold ore body，one gold mineralization body， which suggested that the area has good ore prospects.
The gold veins of Gaoloushan gold mine in Wenxian，Gansu Province primarily located at the lower Devonian strata，and the characteristic of ore rock occurrence is consisted of low resistance and broken alteration phyllite with highly pyritization.Because direct-current electricity can not penetrate carbonaceous strata and its underground transmission is not deep enough，also it is hard to meet in-depth exploration needs.However，the Controlled Source Audio-frequency Magnetotelluric Method （CSAMT） based on the Magnetotelluric （MT） Method，with a strong anti-jamming capability，greater exploration depth，small layout pole pitch，and other advantage such as lower requires terrain，was extensively applied in the solid mineral exploration.We designed a CSAMT profile in mineralized zone with the earlier geological data so as to find the location of the fracture and alteration phyllite，and then it provided some evidence to in-depth drill and decreased its costs.After comparing with the drill results，obviously，CSAMT is an effective way for in-depth exploration in the Gaoloushan gold mine.
In recent years，with the continuous development of the global positioning system，a new measuring method GPS -RTK technology came into being.GPS-RTK technology using the static measurement mode，mainly use ed for the establishment of a variety of level measurement control network，can be based on the requirements of different levels to provide high precision control measurement results. It is widely used in various industries due to the advantages including nil error accumulation，user-friendliness，high positioning accuracy，high performance in processing data.This article focuses on the application of GPS-RTK on the controlled measurement in rock gold minefield of Xingfu Village mainly including the establishment of the controlled measurement network in minefield，option of measurement mode，measuring process in field，data process，assessment of accuracy as well as methods of conversion between original coordinate，etc.Out of practice，GPS-RTK technology is used to provide practical solutions for the establishment of control survey network of the gold prospecting area，and to provide accurate and reliable measurement results for geological work，lay the foundation for the further development of geological work in the next mining area.Compared with traditional measuring technique，GPS-RTK has increased efficiency and accuracy，in the meanwhile saved large amount of manpower & material resources and funds，will be vigorously promoted and used in all walks of life，to play an important role in the national economic construction.
In order to research the development characteristic about crack of smooth blasting under the condition of different coupling medium.The brittle material Von Mises failure criterion was applied and the model of smooth blasting with different borehole spaces and different burdens was established based on ANSYS/LS-DYNA dynamic definite programs smooth blasting crack law under the condition of coupling mediums of air and water.The results found that，as the numerical simulation confirmed，the explosive energy transmitted to rock was different and the development of crack would be influenced due to the two different medium property leading to different coupling mechanisms.The blast-induced crack surrounding the hole and crack bifurcation phenomenon was relatively small and the transfixion crack was formed easily when air as coupling medium.Under the same conditions，the quality of transfixion crack was poor or without significant crack，but the blast-induced crack surrounding the hole was development and with more crack bifurcation phenomenon which was adverse to form the radial crack between the holes.The Von Mises stress relaxation curves between the holes accords with power function relaxation under the condition of two coupling mediums，and the Von Mises hole-wall stress was obviously higher and the relaxation speed was smaller than that of air when the coupling medium was water.The simulation results also suggested that the stress transmitted to rock and blast crack would reduced with the decoupling coefficient，and the effect of smooth blasting was best when the decoupling coefficient is 2.1.
It was found that the crustal stress increased gradually with mining depth，which resulted in the damage of surrounding rock more and more serious，together with a certain propensity to rock burst.In order to further explore the regularity of rock rupture instability caused by deep mining，microseismic monitoring system for continuous collecting microseismic activity information underground was established at Jinqingding mine area，continuous real-time information acquisition downhole microseismic activity.Ore body experiment on mining activities for continuous monitoring was carried out at 825 m-V orebody in the middle section of the 11#，with focusing on analysis of mining disturbance before rock burst under the cumulative volume，energy index and schmidt number change characteristics of seismic parameters，finally we concluded that damage degree of the current ore body was relative less，and rock mass fracture was primarily caused by rock mass excavation and blasting vibration.
The purpose of this paper is to take oredraw scheme optimization scientifically and reasonably.A new optimization method of oredraw design scheme under 3D platform was proposed based on resource value model.Mine geological model and engineering model were established and oredraw level was determined under 3D platform according to original data of mine，and then drawpoints were assigned on the oredraw level automatically.Geological block model and draw slice model were established to obtain drawpoints grade distribution with geostatistics method based on previous study of flow law of ore and rock.Oredraw resource value model which contains basic parameters of market price，mine cost and mining dilution and loss index was established to calculate value and benefit of every draw slice，and then to calculate best draw height，cut-off grade and tonnage of every drawpoint under different technical and economic conditions，so as to determine the optimized oredraw scheme，which ensures the maximization of economic benefits and the maximization recovery rate of resources of mine.The method was implemented using VC++ programming language and hoops visualization tool box.The whole process was carried out in 3D visualization environments.Mine practical examples show that the proposed method is of excellent operability and reliability.
Wavelet neural network has advantages of high precision，simple structure and fast convergence，etc. Therefore，attempts with this advantage model is applied to forecast aspect of acoustic emission，and the new predicting method in mining field be further improved.Based on a huge number of data in the process of coustic emission at laboratory rock loading experiment，a corresponding prediction model can be set up.Firstly，acoustic emission data obtained in the process of monitoring of laboratory experiments can be used to establish Wavelet Neural Network Model，and the acoustic emission monitoring of acoustic emission events rate for network autonomous learning can be further conducted.Finally，the obtained prediction results were compared with the actual value in order to calculate the error.The results demonstrated that the prediction accuracy was higher, and basically comparable with the actual monitoring results，which suggested that the Wavelet Neural Network Model can be employed to predict the acoustic emission signal in future.
In order to improve the bad mine circumstance and ensure the safety of the mine production，the ventilation system must maintain the best operating status.It takes the ventilation system in Baolun gold mine as the study subject，through the investigation and determination of the ventilation system，the problems existing in the underground ventilation system are as follows： the total air volume is insufficient，poor stope ventilation，low efficiency of the main fan，a large amount of air leakage in the mined area，etc.The underground ventilation system was severely disrupted，which seriously influenced the safety in production.Through computer networks resolving and optimization analysis，the ventilation system is optimized and the optimization scheme is put forward.The results show that the effect of optimized mine ventilation system is obviously enhanced，and the total air volume of mine is obviously increased.The fan station efficiency is 83.1%，the compliance of wind speed is 87.5%，the effective air volume rate is 73.7%，and the average temperature of mining surface is 26.3 ℃.The optimization scheme improves the underground ventilation conditions and solves the existing problems of the ventilation system in Baolun gold mine.
As one of the most important transportation engineering in underground mining，mine ore pass is closely related to the security of mine production speed and the surrounding facilities.For the practical engineering of the 4 mine ore pass of a large deep underground metal mine，using 3D laser system，detection of empty area （CMS） and large deposits of 3D software SURPAC，realizing the 3D information acquisition and visualization computing implementation of the collapse district of mine ore pass.3D information acquisition and visualization computing implementation，obtains the amount of the collapse，the range and the boundary information，the biggest collapse width can reach 6 m，collapse volume reach to 1 011 m3. For the security risks of the collapsed mine ore pass，proposed targeting measures，which provided useful reference and technical support for the analysis of the collapse of mine ore pass.
The minerals in a native gold ore had great differences in the grindability property. Lots of fine muds were generated in the grinding process.The gismondite with the high adsorption of gold ions was presented in the ore.Thus the leaching ratio of gold for the gold ore was relatively low by traditional cyaniding method. In this paper，the agitated leaching of the gold ore was studied with Modified Lime-Sulpher-Synthetic-Solution（MLSSS） process.The leaching effects of grinding particle size，slurry pH，added amount of MLSSS reagent，leaching time，oxidant species and their added amount were discussed.The optimum leaching conditions were as follows： weight ratio of liquid to solid was 2.0，55% grinding ore was less than 45 μm，slurry pH was 11.0，leaching time was 6.0 h，added MLSSS reagent was 8 kg/t（ore） and H2O2 amount was 3.33 kg/t（ore），respectively.The gold leaching ratio of 89.81% was achieved.By comparing to the cyaniding method，the gold leaching ratio increased by 16.35% with the MLSSS process.The dissolved oxygen generated from H2O2 could promote the reactions of gold with active ingredients in the MLSSS reagent.Additionally，the H2O2 could directly oxidize gold containing pyrites，which enhanced the gold dissolving reactions.
After acidic pressure oxidation of refractory gold ore containing copper，copper were basically leached into the solution and eliminated the influence on cyanide process，while silver in the pressure oxidation process could combine with jarosite to generate [AgFe3（SO4）2（OH）6].The gold and silver recovery rate reached respectively over 99% and less than 10% in conventional cyanide process.This paper investigated the effect of pulp density，dosage of sodium cyanide and lime，pretreatment temperature and time，cyanide time and carbon density to leaching rate for gold and silver，finally the optimum leaching condition was determined.The silver recovery was improved substantially after silver pretreatment on the condition of 85~90 ℃，pulp concentration of 40% and lime dosage of 40 kg/t which achieved about 85%，meanwhile，the gold leaching rate also remain above 99%.
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