On the basis of studying geological background of gold mineralization and deep prospecting in Jiaodong area，it is summarized and found that Mesozoic tectonic evolution in this region control tectonic-magmatic events，sedimentary environment and mineralization.Magma-deposition-structure-mineralization events have mutual coupling relation with regional tectonic events.Gold mineralization and positioning have close relation with three tectonic episode， they are early Yanshanian period，middle orogenic period and late orogenic period，while have mutual coupling relation with Linglong，Guojialing and Weideshan tectonic-magmatic events.By Statistics，318 samples of gold mineralization ages in Jiaodong area can be divided into three age concentration range as 105~81 Ma，130~110 Ma and 160~141 Ma.According to mineralization and mutual coupling relation of tectonic-magmatic thermal events，it can be divided into gold molybdenum mineralization under the extrusion environment，gold and silver mineralization under the extensional environment and gold and multi-metal mineralization under the post-orogenic environment.Gold mineralization is concentrated in 120 Ma.Geological environments of Sanshan-dao and Jiaojia gold fields which are world-class are unique and can not be copied.
Muping-Rushan gold ore belt lays in eastern Jiaodong peninsula with a great metallogenic condition. Jingshan groups，NNE fault and intrusive bodies of Kunyu mountain are the main ore-controlling factors of gold ore mineralization，and the gold mine is distributed in the broken belts.The structural features of Muping-Rushan gold belt is researched by using remote sensing geological data on the foundation of field study.The geological background of metallogenic progress of gold belt，the features and the formation mechanism of ore-controlling fault，structural factor of deposit，the structural and metallogenic features are all analyzed and summarized，and the result suggests that the gold ore deposit in this area has a distribution rule of a rhombic mesh equidistant and oblique-arrangement property.And on this base，prospecting target area is predicted and seven favorable metallogenic area are filtered，which provides strong geological evidence for further research.
In recent years，with the increasing of the depth of exploration，the traditional methods have not met the requirements of prospecting prediction.It is urgent to introduce new methods and technology.Xilaokou gold deposit is located in north margin of the Jiao-Lai basin，and has reached the large-scale now.For the five largest ore veins in mining area，only No.18 vein was systematically controlled by means of drilling engineering.And little of work has carried out for the other veins and its exploration and research level is relatively low.In order to predict deep orebody of this area, investigate ore-bearing properties of other ore veins and enlarge the scale of the deposit，CSAMT method is introduced.Through the analysis of CSAMT data，it provides the basis for drilling design.And the testing drilling results show that：the progress has been obtained in the deep prospecting of No.17 and 18 veins and confirmed that CSAMT method has a better application effect in Xilaokou gold prospecting，then，put forward the 18 vein and other veins as the focus of future prospecting work.Besides，the survey result shows a low resistively belt in the deep of No.17 and 18 veins.Combined with the regional geological background，we think that it is a larger shovel tectonic zone and has a better prospect for exploration.
It is one of the main types of large and super-large gold deposit for the micro-disseminated gold deposit.Zhen’an-Xunyang basin is located in the northern margin of the Yangtze plate passive continent，and belongs to limited Basin of southern Qinling Mountains.It widely develops a set of carbonate and fine clastic rocks during early Paleozoic-Mesozoic.The tectonic evolution is very complex，and accompanied by a large number of magmatic mineralization，fluid mineralization and hydrothermal mineralization.Based on the collection of previous research results and the field work comprehensive，we analysis the tectonic evolution，lithofacies palaeogeography，tectonic dynamics，the remote mineralization，regional strata and biological mineralization of the Basin.It is concluded that the Zhen’an-Xunyang Basin is one of prospecting area for the large and super-large micro-disseminated gold deposits.
The Xiabate gold deposit is located in the east of the Anqi metallogenic zone，west-Junggar.The tectonic activity is intensive in this area.The regional fracture of the Hatu，Anqi and daerbote spread from north to south, and it forms the NE and NEE tectonic systems.The stratum （Tailegular Formation） is mainly the marine clastic rock and rubble rock in Carboniferous.The basalt and tuffaceous sandstone is the higher gold abundance position， and also the source of ore-forming material position.There are many magmatic rocks distributed in wide area.And the gold deposit is enveloped by the magmatic rocks of Tiechanggou，Hatu and Akebastao，etc.The Xiabate gold deposit belongs to the crushing alteration bearing gold quartz vein type.All sorts of structure controlled the distribution of the gold deposit. In the meantime the gold deposit is occurred at the position of higher gold abundance and correlated closely to the activity of magma.By the study of ore-forming features，the ore genesis of the stratum controlling and tectonics controlling are expatiated in the paper，and designate that the prospecting criteria are the gold quartz vein which lied in the structure and in the alteration zone of pyritization，ferritization，siliconizing and arsenopyrite.All these are served for the mineral resources exploration and the ore-forming prognosis.
Based on the 1：200 000 geochemical exploration data of northwest of Hebei Province and the application of geochemical blocks theory and method，we systematically analyzed the characteristics of copper geochemical blocks and resources.Then three copper geochemical blocks and three anomalies were delineated.The No.3 copper geochemical block was worth higher degree of research and focused on，which was coupled to verify by combing with the characteristics of remote sensing liner-ring structure and regional remote sensing alteration information abnormal zone.Optimizing prospect of geochemical block，draw a copper mineral metallogenic prospect areas，thus achieve the goal of metallogenic prediction.
Qinjiagou polymetallic metallogensis is located in southern Daxing’anling Mountains.The ore bodies are hosted in slate which is the contact zone of C2 j and granite.The trace elements of trench rock samples can reveal the relationships between element and element，element and geology by R cluster analysis and factor analysis in Qinjiagou mining area.And this area is considered to have multiple stages of mineralization.The main metallogenic elements are Zn，Ag，Pb，Au and Mo，and As and Sb are the accompanying elements.The ore is formed by the revrsed cyclic action of the ore-bearing hydrothermal fluid.It is the main prospecting criteria for the intrusive rock of Indo-Chinese epoch and stage of Yanshan.The strong tectono-magmatic activities formed the magmatic hydrothermal deposit and the low-mid temperature hydrothermal deposit.This article has put forward the main prospecting criteria，and provides an important basis for the next step prospecting in this area or the surrounding.
This paper systematically researched some prospecting information of the Zhaishang gold deposit，which included the geological，the geophysical and the geochemical.（1）The geological prospecting information：The Zhai- shang gold deposit is located at the Xicheng-Fengtai-Zhenxun extensional rift basin, in the middle sector of the west Qinling Moutains.The ore is controlled by fault and fold structures，and the ore-bearing horizon are the clastic rocks and carbonate rocks of middle Devonian Anjiacha Formation and lower part of Lower Permian Shilidun Formation.It also produces in the NWW interlaminar faults.Silicification，pyritization，arsenopyrite and brown iron mineralization developed in gold deposit are the direct prospecting marks.（2）The geophysical prospecting informa- tion：Electrical measurement shows that the gold veins have low resistivity and high polarization.Electrical ore bodies and country rocks have big differences.Therefore，both of polarization anomaly， fracture zone and metal sulfide coexist in the Low resistivity zone，the prospecting is more significant.（3）The geochemical prospecting inf- ormation：1∶200 000 and 1∶50 000 stream sediment anomaly in this area are in good agreement with the gold deposits.Moreover，Au，As，Sb，Hg anomaly obvious combined and strongly repeated.It plays an important role in the Zhaishang gold deposit discovery.By the way，the 1∶10 000 soil anomaly is more effective to prospecting mining.Summary of the above prospecting information，we established the prospecting model of the Zhaishang gold deposit and mine regional area.
Making use of the R-type factor analysis for the measurement of stream sediment survey in Western Zhejiang area，six representative factors have been extracted out.Combined with the regional geological background，this paper has discussed the elemental association which could reflect these six factors and drawn the distribution map for the factor score.It helps to provide better parameters for classifying the elemental association types and geochemical subareas.Results show that：Factor 1，with a combination of Cu，Mo，U and Zn，is the major ore-forming elements in this area；Factor 2，with a combination of As，Pb，Ag，is a series of mesothermal-low temperature elements； Factor 3，with a combination of Bi and W，belongs to a series of hypothermal elements；Factor 4，combinated with B,F and Sn is a characteristic of tin-bearing granite，F and B play a vital role as mineralizer；Factor 5，association of radioactive element Th and U；for factor 6，Au is gotten in and Hg is gotten out during regional mineralization.Besides，factor 1 to factor 6 have showed a remarkable zonation on the site of the small granitic rock mass at Yanshanian period（corresponding to some metallogenic specificity） and the trunk fracture zone for metallogenesis，and there is an approximate results between factor 1 to factor 6 and clustering analysis.
The Nearest Neighbor Method（NN） is a simple spatial interpolation method，and the functionality is provided in the currently popular resource estimation software.As NN has the unique disadvantage，it is not commonly used in the practice of resource estimates.Delineation of ore and lithofacies domain generally used traditional geological modeling-manual mode，it is the longest step in resource estimation process.Combined with the project of a Layered platinum ore in South Africa，we have studied that using NN delineates ore and lithofacies domain boundaries with Datamine Studio software automatically，to get higher accuracy and work efficiency.We introduce the modeling process of Datamine Studio software，and applied it in the practical project，and have achieved satisfactory effects.
Aimed at the actual conditions for Qinghai-Tibet Plateau：high altitude，temperature varied，long frozen period squall，lightning，heavy rain，snowfall vagaries of thin air，lack of oxygen，strong ultraviolet radiation，low air pressure，we have identified some easy happened problems in the gold mine commissioning workslevel control measurement in Tibetan Plateau area.An example of Qinghai Province Duola Long wow minenetwork is offered，we point out that using Total Station establish mine basic control points.It is so fast，and has a high precision in the mountains in the Qinghai-Tibet Plateau which have sparse vegetation and good intervisibility.Those targeted methods and measures provide important references for the work of level control measurement.
Safe production is the primary goal of each mining enterprises.But the existence of goaf has caused potential safety hazard for mine production，and also seriously affected the subsequent planning of ore mining.How to accurately grasp the goaf data and scientifically reveal the geometric characterization and mutual spatial relationship is of prime importance for the mine safety and production.Nevertheless，there are many difficulties in measuring goaf，such as the personnel and equipment into difficulties，poor accuracy and high risk.But the 3D laser scanning technology can overcome them.In this paper， taking the Jiaojia gold Wangershan mine as an example，we introduces the contour boundaries and spatial orientation of unknown goaf based on 3D laser scanning technology，so as to lay a solid theoretical foundation for the goaf treatment and resource recovery.
Due to its advantages，such as well adaptability for various rocks，timely function of active prestress and high efficiency for assembling，split-set bolts supporting technique was widely applied in underground mining engineering.Combined with the production practice of Jiaojia gold mine，the radial and axial stress state in split-set bolt were analyzed based on RMR rockmass quality classification and elastic mechanism.Practice effects of the performance of split-set bolts for surrounding rock supporting in Sizhuang mining area has been introduced.It indicated that the split-set bolts played a good role in supporting gold rock，which could be a reference for other similar mine practices.
It is complex and low efficiency for the technology of mining and filling in Qianhe gold mine，specially，it is of mining construction difficult，long construction cycle and low safety factor.Yet there are 50 stopes seted up in the mining area in order to meet the mining production capacity of 500 tons per day，while it lead to the management difficulties and the high increasing of mining cost.Thus，it will be great help for reducing management difficulties and enhancing the exploring and mining efficiency，which improving the stope production capacity and shorten the recovery cycle.Whether it is reasonable for mining engineering and prospecting engineering layout，has a great influence on production efficiency of mining.According to the actual situation of Qianhe gold mine，it is a new technological innovation for using the auxiliary pulse as filling lane to replace the dyke，delineation of ore body again，and as a preparation roadway.
Briefly introduced the installation methods of large and medium-sized skip，details of the application after the disintegration of piecewise installation scheme in blind shaft，Linglong gold mine.In view of the large and medium-sized skip need to collapse to implement the segmentation assembled by wellhead roadway and cage to transport the blind shaft，through the site condition and equipment force analysis，integrated with high strength flange connection，reaming bolt positioning and stagger the collapse location method and process，designed the scheme of skip disintegration.The scheme of skip disintegration overcome the skip size，disassembly and assembly of large deformation，the connection strength is low，making detailed and reasonable skip sorting scheme，successfully resolved the problem of the installation of large and medium-sized skip in blind shaft after the disintegration.
In the process of exploring the optimal depletion mode of mineral resources，the author had previously published two papers，which respectively discussed the optimized mining distribution question of the ore about two or three different grades and reserves，and formed a relatively simplified prototype of a mathematical model of the mineral resources optimal depletion，but it was not always coincide with the actual conditions of the mine （the grade and reserves of ore often are multifarious）.In order to further improve and establish a more realistic optimal depletion mode of mineral resources，we take the optimized mining distribution of aurum ore as an example.Through scientific abstraction，simplification，and using the mathematical method and quantitative analysis，to deduce，induce and summarize the optimized mining distribution problems of many kinds of different grade and reserves of ores，what was obtained is a general applicability，easy to operate，intuitive and simple optimal depletion mode of mineral resources.We think that the model has achieved the desired goal，and has certain utility value and exploratory significance，and can achieve optimal depletion of mineral resources.
In order to promote the recycling of low grade gold resources，many conditional experiments about ore leaching，mudding degree，concentration of NaCN，sprinkling，obsorbency，permeability and origin caustic con-sumption are carried out to study the cyanide leaching character and affecting factors，on the basis of research on chemical composition and ore character of low grade oxided gold ore.The results show that low grade gold ore in Tongguan area is a transitional type between primary ore and half oxidized ore which is of low oxidization level；it is a kind of ore which is hard to leach with undeveloped fracture and tight rock structure，and the natural gold is composed mainly of medium and coarse grain；it is also a kind of leachable ore with low level of harmful elements the leaching rate of which is 95.2% in a leachability test.The rate of 27 days leaching of -8 mm ore obtained from the conditional and composite column leaching experiments is 66%，which shows that the ore is leachable，and the leaching production technique conditions are 5 000 tons ore per heap，-8 mm fraction，3 m heap height，NaCN concentration is 0.03% to 0.06%，pH value is 10 to 12，the volume of sprinkling is 20～50 L/（m2·h） and the time of sprinkling is 30 days.The results of experiment show that the recycle rate of this kind of ore is low，benefit can be achieved only if it can be recycled as waste ore when bonanza is mined.Because this kind of low grade ore is pretty leachable，and the oxidation degree is low，the best way is all-slime cyanidation.
The nature of the ore in Xinhui gold mine is polymetallic sulfide ore which contains many useful elements such as gold，silver，copper，lead and zinc as well as a number of harmful elemental carbon.The content of carbon in ore and concentrate increases with mining depth.Because of the absorption of carbon on gold，higher carbon content of concentrate leads to a poorer leaching and washing effect, higher cyanide slag grade and lower cyaniding recovery rate.Since the beginning of 2011，we have been trying small experiments of adding carbon inhibitors in the leaching progresses in order to reduce the influence of carbon on cyanidation and to improve the recovery rate of gold.The results show that the recovery rate of gold can be improved by adding sodium carbonate in leaching progresses which can suppress the absorption of carbon on gold.The industrial test was carried out since June 2011 that sodium carbonate is added in the actual production of cyanide，and the result shows that cyanide slag grade during June 2011 and December 2011 is reduced by 0.26 g/t than that of 2010，which brings the company an extra economic gain of 1.55 million yuan per year.
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