Longtoushan gold mine is located in Kalaqin banner of Chifeng，Inner Mongolia，it lies in the eastern edge of Inner Mongolia Plateau，and belongs to Nuluerhu mountain，Qilaotu mountain in the eastern part of Yanshan mountains.Through analysis of the orebody geological characteristics and ore features，we understand orebody occurrence of Longtoushan gold deposit deeply，it will provides facilitate for edge and deep exploration prospecting,thus contributing to expand resource vision.At the same time，it will provides more informative geological data and clear prospecting direction for the deposit.
Based on the discussion of Xilinhaote and Sunitezuoqi prospecting environment and mineralization geological background，the organic links of stratigraphic，tectonic，magmatic activities and gold mineraliztions has been system studied.After a preliminary analysis of the areas metallogenic geological conditions，we point out that the majority of deposits （points） significantly controlled by structure，mineralization is mainly related to the late Paleozoic acidic intrusive rocks，sub-volcanic rocks and ductile shear zone，and the main deposit types are quartz veins，altered rock and low-temperature epithermal.Last，with comprehensive study of regional geophysical and geochemical anomalies characteristic，four prospecting areas are divided.There are large gold ore prospects from the east of Xilinhaote to Sunitezuoqi areas.
Yantao mining area lies in the south east of Qiangxu core of anticline in the northwest of Guangxi，regional geological tectonic is very fierce，the folds，faults，joints and cleavage are developed well in the area，which provide favorable tectonic conditions for mineralization.By 1∶10 000 soil geochemical survey，five abnormal bands are circled in this area.By geological interpretation，the prospecting trench and rock chemical analysis，we circle seven gold bodies.We come to the conclusion that using geological interpretation and soil geochemical measurement for surface gold survey is feasible.
The exploration of deep concealed ore-like metal within polymetallic mineralization belt in western part of Henan Province was conducted by using comprehensive geophysical prospecting methods of CSAMT，SIP and high-precision magnetic.The results show that it is useful for the concealed ore prospecting in the area by using the CSAMT method to determine the concealed rock，then SIP method to define the specific buried depth of the target body and determine its ore potential.Two concealed rocks with towards of north-west and lateral trending of the north-east have been delineated by CSAMT method in the area.Two cross-section are measured by using the SIP method，and a bimodal abnormal characteristics is found.So we come to the conclusion that there may be metal sulfides enrichment in this area，which is coincided with the fault fracture zone inferred by CSAMT measured，and the analysis shows that the metal sulfide was disseminated.Since it takes risk of unburying deep concealed ore-body，using multiple geophysical methods in comprehensive survey can greatly reduce the risk，which can decrease interpretation ambiguity in geophysical exploration，improve the credibility and accuracy of geological interpretation.
The metallogenic regularity，metallogenic types and ore-controlling factors of main gold mineralization belts in Northern Xinjiang，including the Ertix，Dalabute，Kalamely，Tulasu-Yelimodun and Kangguertage gold mineralization belt，are discussed a lot.But there is less explore about the similarities and differences and the cause between their geological characteristics.Comparative analysis focused on the characteristics of the metallogenic environment，deposit types and their typical gold deposits is conducted in the paper，it shows that there is significantly difference between these gold metallogenic belts in mineralization type，mineral assemblage，wall rock alteration and mineralization fluid characteristics.Epithermal-type gold deposits are widespread in all these belts，it is not only the gold prospecting direction of the area，but also the revelation for searching porphyry copper deposit.
Luerba gold deposit is a large carlin type deposit occurred in the epimetamorphic sedimentary rocks of the Middle Triassic in western Qinling mountain.Through studing geological characteristics，hydrothermal activity and wall-rock alteration，analyzing ore-controlling condition，we consider that clasolite-carbonatite construction of Middle Triassic are parent rocks of gold mineralization.The ore-controlling structure role of EW-trending is obvious，and rich orebody always occurs in the zones where NW and EW-trending fractures intersect.The quartz dioritic porphyrite，which likely provides energy to the gold bearing solution transportation，plays a significant role in gold ore-forming process.Further analyzation shows that Luerba gold deposit is a large carlin type deposit，which formed under epithermal to mesothermal environment.Besides，the carbonates bearing clastic rock formation，the intersect zone of NW and EW trending fractures，and the quartz diorite porphyrite are beneficial prospecting indicators，the ore belt has the characteristics of equidistant parallel distribution，so we regard these factors can be as the focus of next prospecting.
The gold mineralization characteristics of granitoid-related is an important type of gold mineralization in Nishan ore segment.Through the study of plagioclase granite porphyry veins and its ore body，probing into the basic features of such gold ore，we conclude that the mineralization type is controlled by Yanshanian grantie.The distribution of rock body in the region is closely related to the structure.Under the control of sunder，the veins with generally small scope and size，have near east-west strike，mostly veined output，and a small amount of rock strains.Rock types in the region is acidic rocks，plagioclase granite porphyry.This article focuses on the mineralization and alteration of the plagioclase granite porphyry and gold content，and come to the conclusion that mineralization of 508 vein in Nishan ore segment contains the process of mineral substance migration and enrichment.
By means of ETM remote sensing image’s comprehensive interpretation of fractures in combination with the regional geological background of Gudui-Longzi region in southern Tibet，we made a quantitative investigation on base of the theory of fractal geometry.The results show that Gudui-Longzi region has a high fractal dimension value of fracture，which shows the complicated fracture and the intense tectonic movement.The fractal dimension value of fracture is lower in Mazhala gold-antimony deposit than in Gudui-Longzi region.The dimension value of fracture of nearly north-south and north-west trending fractures is greater than north-east trending fracture in Mazhala gold-antimony deposit.The result shows nearly north-south and north-west trending fracture plays an important ore-controlling role in Mazhala gold-antimony deposit.By studying fractal dimension value of fracture，we may decide relation of fracture and mineralizing in order to provide geological evidence to the next step of prospecting and exploration.
Linglong gold ore field is the resources crisis mines，expanding the resources reserves is urgently needed.Jiuqu ore block located in the eastern part of exquisite gold mine field，is the support and exquisite gold production of the main mining area.There are dozens of ore block in different size，which are crisscross，bringing difficulty for deep ore prospecting.According to these vein spatial distribution，branch complex relationship，the geological feature of the No.5 vein department in Jiuqu ore block is analyzed，also its metallogenic regularities is summed up.Based on this，we constantly get good production achievements，significantly increase the industry and prospective geological reserves，and provide resource for the continued development of the Linglong gold mine.
The lateral trending regularity of endogenic-hydrothermal gold deposit mineralized enrichment zone（orebody） has a close relation with multi-stages tectonic-magma-ore-bearing-hydrothermal fluids activities，it is the deep-variability metallogenic law of the gold deposit mineralized enrichment zone（orebody） and it is also one of the most important cause for the forming of oversized gold deposit.In this paper，we study and analyze the geological features，progressive-evolution process and the orebody’s metallogenic regularity of the main ore-controlling structures，using SURPAC software to establish the spatial-entity model of Jiaojia gold deposit No.Ⅰ orebody，summarize the lateral trending regularity，and establish its prospecting model.On this basis，we have completed the deep metallogenic prediction for Jiaojia gold deposit No.Ⅰ orebody，and predict the mineralization target.The study confirmes that there exist another gold enrichment zone in deep，and which is of great significance for sustainable development，also provides theoretical reference and practical basis for geological research and mining deep geological prospecting work.
To solve the problem of refractory ore types of one gold mine in Gansu Province，we propose a process method of cyanidation leaching from arsenic-carbon gold ore.The study shows that the ore pre-treatment using concentration of 15% NaOH and 2% H2O2 can effectively eliminate the affect of arsenic to cyanide leaching gold.At the same time，we can reduce carbon interference using the method of adding kerosene，it makes carbon activity in ore samples produce passivation，thereby eliminating“robbing gold role”of carbon.The process method can make gold cyanide leaching rate increased to 95%，it has a good economic and social benefits.
For high arsenic containing gold ore，two stage roasting technology for pretreatment in the research and production practice are usually used to obtain higher leaching rate of gold by removing arsenic and sulphur.The key technical problem should be resolved urgently in the research and production is how to adopt low-cost pretreatment method to further reducing the rate of gold in tailing.The research on raising the cyanide leaching efficiency of gold by acid leaching was carried out on the basis of chemical analysis，mineral composition analysis and the gold occurrence state analysis of the second segment calcine.The effects of experimental conditions，such as the grinding size， the volume of concentrated sulfuric acid，leaching temperature and leaching time were investigated.After being milled for 1 hour，the second segment calcine was leached at 95 ℃ for 2.5 hours by using concentrated sulfuric acid dosage 2 tons per ton（to second segment calcine），and the cyanide leaching efficiency 97.86% of gold was achieved.
he gold ore contents particle size ore，most of them exists in the form of submicroscopic gold，arsenic and package pyrite，it is the high arsenic sulfide gold ore.When doing the flotation the gold concentrate containing arsenic，conventional cyanide leaching rate is only 11.84 percent.We carry out the expanding continuous test which is called flotation gold concentrate by bacterial oxidation-cyanide leaching gold，with grinding fineness of 0.071 mm（96 percent），pulp density of 20 percent，pulp temperature of 45 ℃，and pH value of 1.5~1.8，using secondary bacterial oxidation.When the oxidation lasts for 9 days，the gold leaching rate reaches 93.24 percent，which is more higher than cyanide leaching rate（81.40 percent）.In this case，index is increased significantly and the sales problem is solved，and profit increases by more than fifty million per year.The research provides a new mineral smelting technology for the utilization of gold arsenic sulphide ore.
The importance of the grinding operation effection is self-evident to the work of the production and business for a concentrating mill.So how to use a simple，efficient and practical feasible method to improve grinding efficiency is always the dressing worker’s research topic.At present，there are several standard parameters to test the run state of the mill：the grinding machine utilization，the energy consumption of grinding，the grinding cost，etc.Based on a lot of testing and research of ball mill running state，we optimize mill internal structure，adjust the internal ball size distribution，to adapt to the changes in the grinding load.So with less investment，grinding performance is improved.
Along with the strategy of“opening”and “going globe”in Chinese mining industry，more and more solid mineral exploration projects must be abided by the quality-control system authoried by the western security commissions.This paper was sketched the basic controlling factors on the basis of analysis sample.The systematic quality-control methods for the basic assay samples during the solid mineral exploration are introduced minutely. During mineral deposit exploration，sampling quality is monitored through twin samples and field duplicate； preparation quality is assessed through coarse blanks and coarse duplicates which are inserted in sample batch prior to or during preparation.Assaying quality is monitored through SRMs，fine blanks，pulp duplicates that are inserted in the sample batch prior to assaying.By using the quality-control systematic methods for the bacic assay samples mentioned above to the practice of the guangdong Gaocheng Pb-Zn-Ag deposit detail exploration，the author’s procedures which include inserting various samples to monitor and assess sampling，preparation and assay quality as well as the assay results got，all have meet the QA/QC requirements of NI43-101 issued by Canadian securities.In addition，sample assay data was approved by independent consulting institutions.It has certain reference significance.
The mining methods of Jiaojia gold mine can be divided into the upward horizontal slicing-filling mining method and downward horizontal slicing-filling mining method.After drift mining，goaf filling will be adopted.The existing mining method leads to lower mining efficiency，which can not satisfy the demand for the development of production.In order to increase the ore room production capacity，improve the ability of mine，increase the labor efficiency，reduce quasi ratio，and save costs，we begin to research the step-by -step approach caving mining method，based on the original upward horizontal slicing-filling mining methods.After the research and application of the drift mining method，the production capacity of chamber has improved by 86%， which reduce the mining cost and quasi ratio，improve work efficiency obviously.The research and application of this method give mortal contribution to improves production capacity of chamber，reduce cost of production and improve work efficiency，which has significant meaning to the rapid and safe development of mine，establish solid foundation to improve the production capacity of mine area.
As the Jiaojia gold mine depth constantly moving，rock hardness coefficient becomes larger，traditional emulsion oil explosives tie angle column type cut slot or five angle plum hollow cut slot technology blasting efficiency low，has not meet efficient production situation.In this paper，we have introduced granular emulsion ammonium fried drug and large diameter center empty eye spiral cut slot technology.Not only improve the single loop operating footage，but also due to the relatively small number of toxic and harmful gases produced by blasting technology at the same time，to shorten the duration of ventilation and to speed up the operating cycle，so that this technique greatly enhanced the heading face footage and accelerated the speed of development works.
Estimating the error of holing-through survey is an important step of holing-through project.In this paper，according to the reality of Jinchiling gold mine，by combining experience with process of the holing-through project，we select an optimum programme to the holing-through survey.Using error theory and analyzing on the error sources and factors，combining the errors which were from traverse，connection survey and gyro measure.Estimated the probable dimension of error deviation in horizontal and vertical direction.On the premise of assuring the accuracy，reduced as costs as we can in the programme.The programme provided，suitable instruction for the holing-through project，and accumulated a huge mass of data and valuable experience for later survey.
Briefly introduced the reason and method of established local independent coordinate，and the applicability of various methods were analyed.Directed at problems in established local independent coordinate on constructed mine area，proposed the principle and method depend on must not change reference ellipsoid and middle meridian established local independent coordinate combined with small triangulation network.The method is also used to establish local independent coordinate in actual engineering.The local independent coordinate has strict transition relation with state coordinate system as well as ensure accuracy limits about length deformation， the factual data is also compared and analyzed.The method is suitable for geology prospected project about hard to survey connect to state dominate spot and constructed mine area.
We systematically expatiated the application of GARMIN GPS Map 60CSx in stream sediment survey of 1：50 000.The channels pointing mistakes caused by using topographic map and other problems such as pointing distortion and sampling random caused by human factors can be avoided.It improves the efficiency of field sampling.After completing field work，GPS track points can be converted to the file which MapGIS software can identify according to the required scale by using GPSMapGIS software.The converted file can be added to the designed base map by using MapGIS software，managers can easily know the progress in the field and accuracy of sampling through GPSMapGIS software.It plays a very good role in sampling quality monitoring.
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