inlongshan gold belt is a super large carlin-type disseminate gold deposit in Qinling Mountains.Ore belt are divided into the Guloushan，Qiuling，Yaojian and Jinlongshan four ore block from west to east.At present，the primary halo of ore deposit research degree is relatively low，which restricted the deep mine prospecting and forecasting.Based on systematical drilling sample collection of the 118 to 94 exploration line in Qiuling mines，using the correlation analysis and cluster analysis to determine the combination characteristics of gold primary halos.The correlation coefficient of Au and As element is 0.776，which are close paragenesis.The paragenetic relationship of As，Sb and Hg element is stable.It is front anomaly combination of the gold deposit.We research the change law of primary halos of orebodies by primary halo anomalies in different prospecting line and middle section.There are two high backgrounds in 1 000 m and 700 m of the front elements of As，Sb，Hg.The maximum of anomaly intensity of Pb and Zn are in depth of 950 m and 700 m.The largest anomaly scale of Cu，Co and Ni is at 800 m to 700 m depth.The anomaly combination characteristics show that there may have concealed orebody below 700 m between 118 to 70 exploration line.
Bulong gold deposit formed in late-Permian is a small scale gold deposit in Southwest Tianshan，Xinjiang.Orebodies are mainly located in detachment fault belts between layers of Devonian purple，grey-black sandstones and siltstones.Through a comparative research on low metamorphic clastic rock gold deposit in Central Asia，Sawayardun gold deposit in Southwest Tianshan and Bulong gold deposit，a crucial conclusion is made that Bulong gold deposit is a low metamorphic clastic rock gold deposit type.Devonian Kezrtage formation clastic rock，which has a distinct geochemical feature of high Au coefficients of concentration and variation，is an origin of ore elements.Bulong fault is considered as a transport and precipitation fault.Metallogenic model is established according to analyzing ore-controlling factors and unconformable faults between Devonian and Carboniferous strata and gray-black phyllitic sandstones are advised to prospect ores.
This paper analyzed the effects of regional tectonic evolution and the paleohydrogeological conditions on mineralization and the paleohydrologygeochemistry characteristics of the deposits based on the paleohydrogeological conditions.It set forth ore-controlling factors of the deposits and the reasons for the formation of ore belts center step by step.There has been a further understanding of the genetic of the deposits. During the Devonian period，a set of carbonaceous，siliceous and argillaceous hot-water sedimentations was formed in this area.In the course of regional shallow metamorphism during Indo-Chinese epoch，the gold from the ore-forming fluid was enriched preliminarily in the different stages with the participation of underground water， and the related metallogenic hydrotherm and ore-forming materials migrated along the Anchanghe-Guanyinba fault，then gathered in the favorable structural positions and resulted in superposition Yangshan gold deposits.
The Baimaya gold deposit located in north of the Kang-Dian was typical quartz vein-altered rock type gold deposit in the Kangding complex rock mass.Old metamorphic crystalline complex mining area exposed basement and formed strong blocky rock rigidity mainly with amphibolite plagioclase，spun silk the schist as well as tectonic schist，etc.Key component of ore mineral was quartz that accounted for more than 90%，and contained a small amount of sericite，pyrite and other sulfide minerals.Fracture of mining area was seemed to be the SN direction with brittle-ductile shear fracture，which displayed various characteristics of the activity.Through studying the main elements of ore deposit geochemistry，rare earth elements，sulfur isotope，and fluid inclusion，obviously，surrounding rock and altered rock of the Baimaya gold deposit in rare earth elements distribution curve belonged to the right type.δ34S of the gold deposit varied between 2.1‰ and 4.4 ‰ with the average of 1.6‰，and containing fluid inclusions in ore was characterized by rich CO2 The Baimaya gold deposit presented fault development with metallogenic substances brought by the deep magmatic fluid that could improve the surrounding rock and enrichment，which was of great significance for further research and the ore-prospecting work in the future.
Through field geological survey，the microscopic identification and the comprehensive study of ore deposits with previous materials，the Chadong silver polymetallic ore deposit geological characteristics，ore fabric，mineral composition，metallogenic period and phase analysis were summarized，and the metallogenic process was discussed preliminarily.The results demonstrated that the ore deposit was mainly with disseminated ore，vein，net vein and block structure，moreover，the structure was primarily composed with idiomorphic-hypidiomorphic granular，irregular granular as well as metasomatic structure.Mineral composition was given priority to oxide and sulfur compounds，meanwhile，mineral assemblage was with silver （gold）-lead and zinc series，and primarily with sulfide.Additionally，on behalf of the minerals were pyrite，arsenopyrite，galena and silver minerals，etc. In mineral assemblage was characterized by low temperature mineral assemblage characteristics，and metallogenic temperature mainly in low temperature.Overall，metallogenic process has the characteristics of period and stage，including gas-water hydrothermal mineralization period as the main metallogenic period，which can be further divided into quartz-sulfide stage and carbonate rock-lead and zinc sulfide phase.The Chadong silver gold deposit was low temperature type deposit that formed under the action of a fluid medium，such as strata as well as structure，and magmatic rocks.
The Yangshan gold deposit is distributed in the north of Mian-Lue suture zone，meanwhile，there are six ore blocks from west to east which are Nishan，Getiaowan，Anba，Gaoloushan，Yangshan as well as Zhangjiashan.Due to the multiphase tectonic extrusion tensile and the obvious rock deformation traces，thus exposure stratums are primarily the devonian bridge rock group and tuen mun village groups.On the basis of predecessors’ work，through in-depth analysis of the geological and geophysical-geochemical anomaly characteristics of Yangshan deposit， combined with the latest development of geological exploration in recent years，five key prospecting target areas in the Yangshan ore belt were identified，which located in Gaoloushan，Guanyinba，Wujiashan region，and deep of number 360 and 311 series.Therefore，these framed can provide the exploration direction for subsequent attack deep prospecting target areas for the blind and delineation baseline.
The Yangshan gold ore locates in the west Qinling Mianlue slightly tectonic belt.Research area in the east wing of arc structure in Wenxian，was primarily controlled by Anchanghe-Guanyinba and duplex anticline.In addition，the ore body occurs in the fault zone as well as double anticline wing secondary shear strike-slip fault.On the basis of summarizing predecessors’research，combined with the detailed field geological observation，we found that the Yangshan gold deposit ore-controlling structure and its evolution were increasingly complex.Overall，the results indicated that it was formed a set of carbon silicon argillaceous hot water sedimentary in Wenxian during middle-late Devonian period.Mianlue area has experienced mechanism transformation from ocean-land subduction to continental collision in Triassic.Meanwhile，the double arc tectonic system in Wenxian county and nearly EW axial complex fold are formed，and intermediate-acid dike along the early extruded schistosity began to invade in the late Triassic.Early Jurassic entering into the collision orogenic period，breakage occurred the activity of oblique shock left-lateral slip shearing，and contacted with the same period of surrounding rock crushing，alteration.Moreover，mineralization was mainly dominated both by duplex anticline and left-lateral slip joint shear fracture zone.Early Yanshan period，it stretched into the local stage with the inheritance of thrust nappe structure，at the same time formed derived fracture，joint and fold，etc.At present，recognized by the Getiaowan-Caopingliang anticlinorium may only be a fold of the duplex folds north wing.
With the near-surface deposit resource increasingly drying up，mining is towards deep.Meanwhile，because the deep rock stress is imbalance，it seems easy to impact ground pressure.Additionally，the deep rock is under the influence of factors， such as temperature and humidity rising fast，working environment and air quality would be worse，therefore，which can directly cause the less efficiency work，and higher recovery costs.Thus，the filling process problems in the process of deep recycle at Sanshandao gold mine is studied in order to solve the problems of filling times line changes，filling full mobility，slurry particles and the velocity which acting on inner wall of pipeline and caused seriously affects to the quality of filling technical， that is of great importance for keeping the deep filling system stable.
The gold ore associated in Haxiyatu iron-polymetallic deposit has reached medium-scale，which can greatly improve the economic efficiency of the iron-polymetallic deposit.Research on comprehensive recovery and utilization method of gold ore is very important.The gold ore belongs to the sulfide skarn type，with the natural type belonging to the mixed ore.The metal minerals in the ore are dominated by magnetite，pyrrhotite and pyrite，and noble metal minerals are native gold and electrum.Through the experiment，the flotation process scheme is recommended that “gold flotation，tailings magnetic iron and iron concentrate flotation sulfur”.Leaching process scheme is recommended that“all sliming cyanidation carbon leaching，tailings magnetic separation iron and iron concentrate flotation sulfur”.According to the test results，the process by all sliming cyanidation carbon leaching and magnetic iron （remove sulfur by floating） can obtain better effect.
The premise of beneficiation is to completely separate target minerals from gangue minerals，so the proportion of intergrowth minerals has an important influence on the beneficiation indexes.Without increasing investment，it can reach the goals of fully disintegrating，lowing the level of intergrowth and improving the floatability of target minerals by reforming process and regrinding middling（roughing and scavenging concentrates）during the full process.Field practice showed that after process Reformation，the concentrate grade had increased from 37×10-6 to 45×10-6，the god recovery rate was risen by 0.6%，and economic benefits amounted to 11 974 thousand Yuan per year.
Combined with the current situation that the overseas mineral resources development projects have long investment cycle and variety risk factors，the risk evaluation index system of uranium resources overseas investment projects was built，AHP and VIKOR algorithm were applied to build risk evaluation model of uranium resources overseas investment projects.The model is applied to do the best selection of four investment programs，compared and sorted alternative investment programs through calculating the numerical，and the results show that VIKOR algorithm was effective and operational on risk evaluation of uranium resources overseas investment project.
Ammonium ceric sulfate-mercurous nitrate system catalysis colorimetric method for determination of trace gold was restudied by fixed time and absorption spectrophotometry，and under the experimental conditions the catalytic reaction constant K value was determined.Meanwhile，we also tried without color again using the K value，which was calculated under the condition of the amount of gold that was four times of the original method，indicating effectively expands the range of measurement of gold.The method was employed to determine the national level standard material of gold，and the result was in accordance well with the recommended value.Additionally，using plasma mass spectrometry and the provisions as control sample analysis，the determination results conformed to the requirements of the industry standard.
Because of the particularity of the cyanide liquid，the frequently-used analysis methods can’t achieve an ideal recovery rate of gold and silver.The lower analysis precision of the methods affected the controlling of the process indicators.At the same time，Alkaline cyanide liquid caused a severe corrosion for the instrument， which reduced the equipment life and stability and increased the operating costs.By acidified the high-grade liquid cyanide，using acetate fiber which soaked by organic solvents enriched gold and silver in the solution at the media of a certain concentration aqua regia，and then desorbed them using 20 g/L of thiourea solution in a water bath heating.Finally，the recovery rate of the gold and silver were analyzed by ICP-AES in thiourea solutions which achieved 98.5%~100.5%.The detection limit of the method is 0.0021 for gold and 0.0030 for silver.
In order to solve the fierce pressure and ore vein direction disorder problems cause by complexity distribution of vein gold and diversity of geological structure，stress measurements of six points is conducted in Tugurige gold ore by means of hollow package postures triaxial strain gauge using borehole stress relief method systematically.The stress measurement data shows that Tugurige gold mine belongs to typical tectonic stress field and the orientations of maximum horizontal principal stress is near to NE，it fit to the geological tectonic compressional movement.The magnitudes of the stresses are medium values.The results also show that the ore vein and the maximum principal stress is approximately vertical.In-situ stress distribution characteristics can give reference for the mine production design and the underground pressure control，provides a preliminary judgment for prospecting direction.
Focusing on the refractory gold concentrate in northwest region，the technology of roasting-cyanidation was studied and the optimized condition was obtained.Experimentation results show that the removal rate of S and As are 99.99% and 52.56% respectively，and the gold leaching rate is above 88.92% under these conditions：-0.043 mm was about 52.85%，the one stage roasting with the temperature of 450 ℃ and time of 1 hour，two stages roasting with the temperature of 700 ℃ and time of 0.5 hour.The best cyanide-leaching parameters are initial densities of sodium cyanide is 0.5‰，the liquid-solid ratio is 4 and time of 24 hours.
The gold ore of Shandong Gold Mining（Xinhui） was refractory ore，which was containing polymetallic sulfides ore and a certain amount of carbon.The dressing and smelting process is floatation，gold concentrate cyanidation，zinc dust replacement and gold mud hydrometallurgical process，but gold leaching is difficult dued to the high content of impurities concentrate and carbon robbing effect.In order to improve gold recovery，GOLDOXTM hydrometallurgy process was studied by bench scale test and 6 month plant scale test was conducted since July，2013.It was shown the process promoted leaching kinetics and improved gold recovery.The residue gold grade reduced 0.20 g/t in average after pure oxygen was applied. It means operating profit increase 808 000 Yuan per year in the plant.This would not only provide a successful example of oxygen leaching process，but also promote the high effective oxygen application in the Chinese gold industry.
Gravity separation and cyanidation combined process was applied on the hydrothermal alteration types gold ore in Xinjiang Province.The test results revealed that coarse gold concentrate with grade of 311.70×10-6 and recovery of 42.23% was obtained using Knelson centrifugal separator under the conditions of gravity value of 60 and fluidzed water volume of 3.5~4.0 L·min-1.Gold leaching efficiency of gravity separation tailings was 97.41% using cyanidation process under the conditions of milling size of -0.045 mm 90%，cyaniding time of 24 h and pulp density of 40%.Therefor， the total recovery of gold ore was 98.81% using gravity separation and cyanidation combined process.
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