It presented acidic volcanic rocks at upper Jurassic Manketouebo Group.According to the lithologic characteristics，it can be divided into eruption facies，the overflow facies and volcanic sedimentary facies，moreover，mineralized alteration mainly showed silicification，sericitization，chloritization，epidotization，carbonatization，but pyritization and molybdenum mineralization in local area.Volcanic rocks exposed and it was found that Mo and Ag elements in surrounding area exhibited 1∶50 000 chemical exploration anomaly with high strength and large scale； through the anomalies，Mo element peak was 433.4 μg/g and Ag element peak was 3.09 μg/g.Additionally，Mo and Ag elements has the feature of obvious enrichment and strong differentiation in volcanic rock and soil samples with main elements of SiO2 whoes content is 72.30%~74.26%，overall，it showed high silicon，aluminum，high degree of differentiation，high potassium calc-alkaline series.The amount of rare earth elements（ΣREE） was high with an average of 173.38×10-6，moderate negative europium anomaly，light and heavy rare earth obvious fractionation，enrichment of light rare earth.After comprehensive analysis，we concluded that the study area has formed potential of molybdenum and silver associated with late Mesozoic acidic volcanic rock and ground.
For purpose of making a clear acknowledge of nature and origin of the Jiaodong ore cluster ore-forming hydrothermal，date regarding mineralization ages，hydrogen and oxygen isotopes，sulfur isotope，argon，helium and radioactive isotopes were collected and reanalyzed briefly.The results showed that ore-forming hydrothermal was characterized by mainly crustal origin with minor proportions of mantle involvement.It was found that hydrothermal fluid was caused by early Cretaceous magmatic activities（Guojialing rock mass and Weideshan super-unit），acted the role of provider of the ore-forming hydrothermal.Over the same period enrichment mantle-derived magma（mafic dike） likewise provided partially or hydrothermal ore-forming materials.In the process of the Pacific plate to Eurasian plate subduction，fluid was released，which led to the partial melting of mantle lithosphere，the enrichment of lithospheric mantle source basic magma formation，and the bottom effect of magma resulted in partial melting of crust and formed parental magma for the Guojialing granite（Early Cretaceous）.With continuous subduction plate，lithospheric mantle melted persistently，moreover，the sustained high temperature of mantle-derived basic magma caused the partial melting that happened at lower crust depth，and finally formed the mountain superelement Weideshan super-unite（late Early Cretaceous）.Fluid appeared in the process the Early Cretaceous magmatic assault on precipitation，and the fluid circulated in the shell and extracted to ore-forming material.Finally，under the condition on favorable NNE pull-apart structure，the ore-forming material reacted with surrounding rock and become ore material precipitation as variation of ore-bearing hydrothermal temperature pressure conditions.
The east Kunlun structural belt which is called “Gold belt” is one of the famous mineralization belts in China.Guoluolongwa is a large gold deposit located in the east end of east Kunlun and it is controlled by fractures.Even many prospecting work have been done，the genesis of the deposit is still unclear，that block the prospecting work.The ore bodies occur in the phyllonite and the ore belongs to quartz-vein type.Given the regional geological evolution，ore geology and the isotopes character，we conclude that the gold deposit is a magmatic mesothermal quartz-vein type deposit which formed during the orogeny.It will make a reference to the prospecting work of the deposit and similar deposits in the east Kunlun.
Production of associated gold with BIF accounts for around 13% of the world’s gold production，almost one third of the gold production in Tanzania is from stripped iron formation gold mine.Through analysis of characteristics of aeromagnetic anomalies in south of Lake Victoria in Tanzania combined with regional geological background，occurrence scope of BIF sequence related to gold ore was interpreted，and then target prospecting area was determined.It was found that the coverage of swampy black soil and weathering was thick in the study region.In addition，we applied magnetic differences significant characteristics of ore rock and surrounding rock to delineate distribution location of iron formation related to the gold mine by ground magnetometry.The results demonstrated that the form of abnormal ΔT was clear with morphology in order and high credibility，which provided a strong basis for drilling engineering arrangement，and the mining area has proven（332+333）34 t gold metal resources presently.Meanwhile，the distribution characteristics of mining area peripheral magnetic anomalies indicated great potential for prospecting in the area of aviation.Air，ground magnetic survey in searching for iron formation gold deposits played an important role，which was efficient exploration methods for looking for the BIF deposits，and the methods had extremely important guiding significance for searching for iron formation gold deposits in the mining area periphery and other similar areas.
Because the grinding ball is big and operating parameters are not reasonable in the the sulfur gold ore dressing plant of Qinghai Province，grinding efficiency is low in milling-classification operation system，the capacity is smaller and grinding fineness is bad.Based on the previous test in the laboratory and the calculation of the half-theory formula，the ball and ratio are determined.The JKsimMet soft is taken to simulate industrial test process to find the best operating parameters in milling-classification operation system and make industrial test.Good practice dictates that the JKsimMet soft can simulate the milling-classification operation and get a better result that provide a guidance for industrial experiment，the conclusions are obtain that the capacity of primary grinding increases by 6.5 t/h，metal consumption reduces by 14.29%，grinding fineness adds by 27.9%，P80 drops by 60.91%.The fineness grinding of the secondary raises by 31.3%.P80 cuts down 13.31%.The grinding efficiency is improved and the capacity is increased.Milling-classification operation system is better.
Mining method optimization was conducted in Sanshandao gold mine to increase mining productivity，and stage open stoping and upward-layered combined mining method was proposed.The stage open stoping and upward-layered combined mining method plays very important role in increasing efficiency of trackless equipment.Cable anchor pre-support and crown pillar bolt wire mesh support were used in major fault F1 on the hanging wall to ensure the working safety.Upward-layered and fill method was used for panel pillar recovery.To minimize the exposed area，hanging wall support pillar was left for recovery at the final stage of stope panel.The practice shows that the sublevel stoping and upward cut and fill combined mining method has the advantages of small degree of development，large production capacity，high efficiency and safety.
It is difficult to flotation separation of some Ag polymetallic ore because there are many different kinds of metallic sulfide minerals and the ore properties is very complex.In order to solve these problems，the identification of technological mineralogy and mineral processing experiments were conducted in the paper.By closed circuit tests，the copper concentrate which with the Cu grade of 27.22% and recovery rate of 85.29% could be obtained，as well as the lead concentrate which with the Pb grade of 56.37% and recovery of was 85.02%.The total Ag recovery rate of them was 86.73%.The zinc concentrate which with the Zn grade of 53.22% and recovery rate of 77.48% was also gotten.Compared with the mineral processing practice，the technology in the paper is not only with concise flowsheet and simple reagent system，but also bringing better concentrate grade and recovery rate of Cu，Pb，Ag.
The slag stemmed from copper metallurgy with copper and iron around 0.72% and 39.84% was from Yunye，and was associated gold and silver.Main copper minerals in the slag were elemental copper，chalcocite and zigueline，and iron was mainly in the form of iron silicate.Copper minerals consisted of microgranular disseminated and closed associated with olivine in the slag，which belonged to the refractory secondary copper resource.Concentration process for copper and Ag and Au recovery was determined as stage grinding-stage recovering from the fine particles slag，and mixed middling regrinding with CuSO4 as activator.The laboratory experiment was completed and a mixed concentrate with a Cu grade of 20.27%，Au grade of 2.59 g/t， Ag grade of 230.37 g/t，and Cu recovery of 30.98%，Au recovery of 35.61% and Ag recovery of 34.34% were obtained.These beneficiation indexes were finally improved.
Abstract: According to the existing issues includes part of the old process equipment，high energy consumption of the equipment as well as processing ability that is difficult to match the mining capacity，thus the work about capacity expansion and remolding is carried out.Concretely，for flotation process，a coarse，two fine，three sweep are changed to two series of work，and the process consists of a coarse，two fine，two sweep，and the overflow type ball mill （MQY3660） as a new grinding equipment.In addition，Using hydrocyclone FX500 replaces the original screw pole machine，and new pressurization filter XMZGFS200/1250-U is applied so as to satisfy the requirement of gold concentrate filter，and part of the slurry pump，plunger pump and other auxiliary equipment need to be updated.The results present that handling capacity is up to 1 500 t/d after remolding of dressing plant，the capacity in a year is more than 160 thousand tons，and annual output of gold metal is around 330 kg，which leads to extra profit about 10 million RMB.
Rock burst is a kind of common geological disasters in deep mine in the process of mining，which is not only threatens the safety of underground personnel，equipment，materials，but also can lead to the destruction of underground stope structure.The rock burst hazard can be prevented by researching and analyzing the tendency，intensity and location of the rock burst.Based on the analysis of the impact energy index of rock WCF and the elastic deformation energy index of rock WET，we found the question that WCF exaggerated the quantity of actually stored in the elastic deformation energy of rock.So the paper put forward the actual impact energy index W，and build up a new rock burst prediction technology rely on the actual impact energy index W-based，the elastic deformation energy index WET and rock brittleness index K supplemented.The prediction technology is applied to forecast the rock burst in Dongguashan copper mine，and the results show that using the W is better than WCF in forecast rock burst problem，in addition，the prediction results were more realistic and reliable.It means that the new rock burst prediction technology is effective.
Aiming at the characteristics of high stibium and bismuth content in lead anode mud，to overcome the disadvantage of analysis of silver by conventional AgCl gravimetry，several precipitation conditions for AgCl in tartaric acid-PbCl2-HNO3 system were investigated in this work.The results showed that AgCl can be precipitated completely when PbCl2 was used as coprecipitator，the concentration of tartaric acid was more than 15% in nitric acid solution and temperature was 70 ℃ for 30 min.This method eliminated the interference of copper，stibium and bismuth that exist with great quantity in lead anode mud.It was a rapid and accurate method，and the results was in accord with the fire assay’s.The proposed method was simple and low cost and suitable to determine silver whose content was more than 5% and coexisted in lead anode mud with high content of stibium and bismuth.
Cutting groove is an important mining technology of sublevel caving method.The quality of groove greatly influence the effective of subsequent blasting and mining of the ore room column.It uses a conventional method of self-cutting with cutting raise for the mining area with soft and breaking orebody，but there are some great potential safety hazards，such as constructing cut well and setting up platform and alternating blasting order and so on.The method of fan-shaped medium-length hold blasting self-cutting with non-cutting raise can surmount above deficiencies which is simple to construct with high quality of self-cutting，saves the cutting patio construction and ensures people operation safety radically.The method has a broad promotion and application value.
Treatment of gold mine wastewater with the characteristics of cyanide，high copper，iron by the chemical precipitation-electric adsorption combined technology，the analyzed and discussed were focused on the reaction principle，the technological process and the result of the reaction.Research shows that the method is viable to treatment wastewater containing high concentration of cyanide.After precipitation by ZnSO4，the precipitation rate of free cyanide，Fe and Cu in wastewater were 100%，85.89% and 99.43%，respectively.After advanced treatment by electric adsorption，the removal rates of Cu，thiocyanate，and free cyanide were 98.68%，43.60% and 99.57%，respectively.The XRD analysis showed that the sediment from zinc sulfate precipitate mainly includes Zn2[Fe（CN）6]，Zn（CN）2 and CuCN，and the sediment from the electric adsorption is mainly CuSCN.Sediment and the anode plate after saturated adsorption can be comprehensive treatment and recovery of cyanide and metal，and the wastewater can be returned to the leaching system for recycling at the same time.
The gas-liquid-solid three-phase stirred tank reactor is widely applied in the chemical metallurgy and environment protection.The lack of basic experimental data makes it difficult to scale up a gas-liquid-solid three-phase stirred tank.The concentration distribution of the dispersed phases（bubbles and solid particles） can reflect the characteristics inside the reactor directly and effectively.There is still no reliable measurement technique to effectively reflect the characteristics of local phase holdup distribution inside the reactor.This paper reports a sampling tube with a bell mouth to measure the local holdup，and its feasibility is tested.The measurement is more accurate when opening size is 3d and it is more likely to collect gas when opening downwards.Improved sampling method is applied to measure the local phase holdup in the stirred tank with an air-water-quartz sand three-phase system.The experiments use single-layer Rushton disc turbine（RTD），analysis of these experimental data suggests：The local solid holdup increases in the radial direction while it decreases along the axial distance from the bottom to the top，the local gas holdup decreases in the radial direction，and it is relatively uniform in the axial direction.The present results are qualitatively in conformity with our comprehension of this kind of reactor.
The influence of chloride ion on the biooxidation of gold-containing pyrite and the formation of products were studied in this work.Biooxidaiton results showed that the addition of 0.01 mol/L chloride ion has significantly promotion action on the oxidation dissolution of gold-containing pyrite，while it has inhibition action on the biooxidation of gold-containing pyrite for it can inhibit the growth of the microorganisms when the concentration of chloride ion is higher than 0.04 mol/L.XRD analysis showed the formation of elemental sulfur on the surface of the ore when the chloride ion is in the absence of the biooxidation，while the presence of chloride ion can effectively eliminate the accumulation of elemental sulfur on the ore surface.The promotion action of chloride ion should mainly for it can eliminate the accumulation of elemental sulfur，which hamper the biooxidation of gold-containing pyrite.
Fine cyanide tailing particles have slow settling speed and it is difficult for de-watering.Therefore，it is needed to use flocculant to improve the settlement characteristics of this kind of tailings.In this paper，the optimum dosage of cationic flocculant HLM and nonionic flocculant PAM are determined by the sedimentation and turbidity removal experiment of cyanide tailings suspensions，the average particle size of which are 30 μm，14 μm，3 μm respectively.In addition，the flocculation performance of two flocculants for different particle size of suspensions is compared.The results show that the flocculation effect of HLM is better than PAM for the three different particle size distribution of suspension.In addition，the smaller the particle size is，the more obvious the flocculation advantage of cationic flocculant is.
The analysis results of ore chemical composition at a certain micro-disseminated gold demonstrated that gold grade was 3.51×10-6，content of SiO2 was as high as 71.88%.In addition，the content of organic of carbon even reached up to 2.51%.After analyzing the XRD and phase of gold，it was found that the ore main minerals were primary composed with quartz，calcite and sulfide.According to the characters of the ore，when employing the thiourea or thiocyanate leaching directly，low leaching rate can be obtained.When employing the thiourea-thiocyanate leaching，better leaching rate can be obtained.Using factorial experimental，paid attention to the amount of thiocyanate，thiourea and ferric sulfate.The results showed that the amount of ferric sulfate and thiocyanate dosage interaction significantly.Then optimize the leaching time，pH，liquid-solid ratio.The test results showed that under the conditions that roasting temperature is 600 ℃ and roasting time is 60 min，the gold leading rate of 75.03% was achieved when pH is 1.06，the dosage of ferric sulfate，thiocyanate and thiourea are 14 kg/t，10 kg/t and 2 kg/t respectively，the leading time is 7 h，liquid-solid ratio is 3∶1.
Cip process was applied to extract gold in Beiya iron-gold mine in this study.In order to fully recycling valuable elements，such as gold and silver from cyanide leaching，and reduce gold and silver loss caused by coconut shell charcoal high carbon loss，on the basis of fully research on features of the Norit cylindrical activated carbon in the Netherlands，then We carried out a small test and industrial test.The results demonstrated that the Norit cylindrical activated carbon were better than that of coconut shell charcoal in adsorption and carbon loss rate，etc.The Norit cylindrical activated carbon was used to 2000 t/d and 3 000 t/d dressing plant，and significant effect was obtained，additionally，the gold adsorption rate increased by 0.94%，silver adsorption rate increased by 3.17%，carbon loss reduced by more than 50%，which has created significant benefits for the enterprise.
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