China National Gold Group Corporation

Beijing, China

China National Gold Group Corporation

Beijing, China

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Cao Y.,Beijing Forestry University | Wang B.,Beijing Forestry University | Guo H.,Beijing Forestry University | Xiao H.,Beijing Forestry University | Wei T.,China National Gold Group Corporation
Ecological Engineering | Year: 2017

The loess plateau of northern China has always been severely affected by drought and rainfall, impacting ecological integrity and sustainable development in particular. Super-absorbent polymers (SAPs) can relieve the pressure of water shortages and change the process of rainfall-runoff. In this study, SAPs were mixed with soil in percentages(weight ratio) of 0, 0.25%, 0.5%, 0.75%, 1% and 2%; then, these mixtures were applied in 5 cm depth layers in runoff plots of 5 m × 4 m for every treatment (T1, T2, T3, T4, T5). Artificial rainfall intensity was controlled at 40 mm/h, and the rainfall duration was 0.5 h when the soil physical and chemical properties were surveyed. With SAPs, the initial runoff time of different treatments increased by 21.5-102.7%; the amount of surface runoff decreased remarkably; the SAPs could reduce the loss of soil and water: the runoff reduction effect was 24.6% (T1), 41.5% (T2), 46.5% (T3), 50.7% (T4), and 60.6% (T5); the sediment reduction effect was very significant at 58.8% (T1), 74.1% (T2), 85.6% (T3), 80.9% (T4), and 75% (T5); and the lowest losses of total nitrogen (TN 0.09 kg), total phosphorus (TP 5.02 g) and total potassium (TK 0.08 kg) were measured in T3,with 14.9%, 14.2% and 13.1% that of the control (CK), respectively. The soil moisture content increased by 19.2%, 32.5%, 33.5% and 31.3% compared to CK in the different soil layers; SAPs could raise the soil temperature by 0.72 °C (T5) and lower the soil temperature by 0.53 °C (T5) in September and July, respectively. The aboveground biomass and underground biomass of the treatments increased by a maximum value of 84.4% in T3, which was 38% greater than CK, and the vegetation in T3 (44 kinds) was the most abundant and it was 69.2% more than CK (26 kinds). The effect was not always positively correlated with the percentage of SAPs. The application of SAPs in this study showed a comprehensive utility (soil erosion prevention, redistribution of soil water and temperature, maintenance of fertility and the synergy between SAPs and plants), which suggest that the most basic goal, to ensure socio-economic and ecological sustainability in dryland systems, is obtained. © 2017 Elsevier B.V.


Cao Y.,Beijing Forestry University | Wang B.,Beijing Forestry University | Wei T.,China National Gold Group Corporation | Ma H.,REPUBLIC RESOURCES
Environmental monitoring and assessment | Year: 2016

Populus davidiana, Leuchtenbergia principis, and Pinus tabulaeformis are important greening tree species with a cosmopolitan distribution. However, the stoichiometric characteristics and element reserves of stands of these three species are not particularly clear. In this study, we conducted a plot-level investigation of forest stands of these species in the loess area; these have been closed forest stands more than 28 years. Trees were sampled from an area of 50 m × 20 m (in 6, 8, and 9 plots, respectively), which was sufficient for shrub (2 m × 2 m), herbal species, and litter (1 m × 1 m) investigations. The C, N, and P concentrations and the C:N:P stoichiometry in five different soil layers (0-10 cm, 10-20 cm, 20-30 cm, 30-50 cm, and 50-100 cm) and in the leaves, stems, branches, and roots of the plants were examined. The soil element concentrations and density were affected by soil depth. The element content had a significantly negative correlation with soil depth, and element density differed significantly among the soil layers. A particular element in a particular organ differed significantly between the forest stands, and the same element in different organs of the same stand was also significantly different. The C, N, and P element reserves in the soil were considerably higher than in the plants. Our results indicate that there are different stoichiometric characteristics and element reserves of the three stands in a closed forest on the Chinese loess plateau, which may provide a reference when we develop and optimize the structure of forest stands.


Yao X.-F.,China University of Geosciences | Wang Y.,Chengdu University of Technology | Chang Z.-S.,China National Gold Group Corporation | Zheng W.-B.,Chengdu University of Technology | And 3 more authors.
Journal of Chengdu University of Technology (Science and Technology Edition) | Year: 2011

The Jiama copper-polymetallic ore deposit is a super large ore deposit in the central Gangdese. The petrologic, petrochemical, rare earth and trace element characteristics of the skarn are studied in this paper. The skarn is distributed over the interformational detachment zone between Late Jurassic Duodigou Formation and Lower Cretaceous Linbuzong Formation as bedded and stratoid forms. It is distributed from top to bottom as a zoning of skarnization hornfels, garnet skarn, wollastonite skarn and skarnization marble. It is the calcareous skarn type, characterized by minor, negative Eu anomalies, minor negative Ce anomalies and LREE enrichment, as well as the enrichment of large ion lithophile elements (LILE) such as Rb, K, U and Th and depletion of high field strength elements (HPSE) such as Ta, Nb and Ti. The geochemical characteristics of the skarn are restricted by that of marbles and affected by that of granites. This indicates that the skarn has something to do with marbles and granites. As a shielding layer from hydrothermal solution permeation, the hanging hornfels is favourable for forming the consecutive skarn. The lithologie interface between hornfels and marbles, a expanding space formed by the nappe and detachment movement, is a key factor for the large-scale distribution of the large skarn-type copper-polymetallic ore bodies. It is concluded that the Jiama deposit is not a submarine exhalation-sedimentation type but a magmatic hydrothermal contact metasomatic type ore deposit.


Cao Y.,Beijing Forestry University | Wang B.,Beijing Forestry University | Wei T.,China National Gold Group Corporation | Ma H.,Guangxi Institute of Water Resources Research
Environmental Monitoring and Assessment | Year: 2016

Populus davidiana,Leuchtenbergia principis, and Pinus tabulaeformis are important greening tree species with a cosmopolitan distribution. However, the stoichiometric characteristics and element reserves of stands of these three species are not particularly clear. In this study, we conducted a plot-level investigation of forest stands of these species in the loess area; these have been closed forest stands more than 28 years. Trees were sampled from an area of 50 m × 20 m (in 6, 8, and 9 plots, respectively), which was sufficient for shrub (2 m × 2 m), herbal species, and litter (1 m × 1 m) investigations. The C, N, and P concentrations and the C:N:P stoichiometry in five different soil layers (0–10 cm, 10–20 cm, 20–30 cm, 30–50 cm, and 50–100 cm) and in the leaves, stems, branches, and roots of the plants were examined. The soil element concentrations and density were affected by soil depth. The element content had a significantly negative correlation with soil depth, and element density differed significantly among the soil layers. A particular element in a particular organ differed significantly between the forest stands, and the same element in different organs of the same stand was also significantly different. The C, N, and P element reserves in the soil were considerably higher than in the plants. Our results indicate that there are different stoichiometric characteristics and element reserves of the three stands in a closed forest on the Chinese loess plateau, which may provide a reference when we develop and optimize the structure of forest stands. © 2016, Springer International Publishing Switzerland.


Chen Q.,Central South University | Zhang Q.,Central South University | Wang X.,Central South University | Wang X.,Hunan Zhongda Design Institute Co ltd | And 2 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2016

In order to study the hydraulic issue of paste-like unclassified tailings backfill slurry transported by a pipeline system, the rheological behavior of paste-like was analyzed with Bingham model, the rheological parameters in different slurry mass fractions were obtained through 3D simulation in FLUENT, then, a pipeline hydraulic model of paste-like relating to inner diameter, average velocity and slurry mass fraction were constructed using MATLAB. The results show that the hydraulic gradient is inversely proportional to the pipe diameter, and proportional to average velocity of backfill slurry. The calculation error of this model can be controlled in 6% proved by annular pipeline test. © 2016, Editorial Board of Journal of CUMT. All right reserved.


Chen Q.,Central South University | Zhang Q.,Central South University | Wang X.,Central South University | Xiao C.,Central South University | Xu D.,China National Gold Group Corporation
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

In order to reduce the cost of flocculating sedimentation of unclassified tailings and improve the effect of sedimentation, magnetized water was introduced to the flocculating sedimentation experiment of unclassified tailings from a mine. The effect of magnetized water on flocculating sedimentation was explored. Furthermore, the changing laws of flocculating sedimentation velocity and mass fraction of underflow of unclassified tailings were researched under different magnetization conditions. The results show that in the progress of flocculating sedimentation of magnetized water-unclassified tailings, the saturation point of the unit consumption of flocculants (sedimentation velocity is maximal) is 1/3 lower than that of tap water. Moreover, the increasing amplitude of sedimentation velocity and mass fraction of underflow are 1.4-2.1 times and 3.2%, respectively. Besides, flocculating sedimentation has the best effect when the magnetic induction B is 150-200 mT, magnetized time t is 20-25 min, and cycling rate of water v is 2.0-2.5 m/s. Therefore, magnetized water is capable of reducing the unit consumption of flocculants and improving the sedimentation velocity and mass fraction of underflow under the condition of suitable magnetization. © 2015, Central South University of Technology. All right reserved.


Li B.,Beijing University of Chemical Technology | Liu Z.,Beijing University of Chemical Technology | Han C.,Beijing University of Chemical Technology | Ma W.,Beijing University of Chemical Technology | Zhao S.,China National Gold Group Corporation
Journal of Colloid and Interface Science | Year: 2012

Mesoporous silica pillared clay (SPC) incorporated with tungstophosphoric acid (HPW) has been synthesized via in situ introducing P and W source in the acidic suspension of the clay interlayer template during the formation of the silica pillared clay. The samples were characterized by XRD, XRF, FT-IR, TG-DTA, N 2 adsorption-desorption, and SEM techniques. The results showed that the HPW formed by in situ method has been effectively introduced into the framework of mesoporous silica pillared clay and its Keggin structure remained perfectly after formation of the materials. In addition, samples with similar HPW loadings were also prepared by impregnation method using SPC as the support. HPW in the incorporated samples was better dispersed into the silica pillared clay than in the impregnated samples. The results of catalytic tests indicated that the encapsulated materials demonstrated better catalytic performance than the impregnated samples in oxidative desulfurization (ODS) of dibenzothiophene (DBT). © 2012 Elsevier Inc.


Zheng W.-B.,Chengdu University of Technology | Li F.-J.,Chengdu University of Technology | Tang J.-X.,Chinese Academy of Geological Sciences | Song X.,China National Gold Group Corporation | And 4 more authors.
Geological Bulletin of China | Year: 2010

In this paper, putting the skarn-type ore body as the research object, according to the semi-variogram analysis of main internal symbol ore-grade in ore-body and establishing a corresponding spherical model, we get many parameters, as lag distance, nugget, variable-range, for the mainly variable directions of ore body. According to these parameters, the variation coefficients at every aspect of main elements, such as copper and molybdenum, in its copper-molybdenum ore body, are both 0.45. It indicates that both the main elements and the symbiotic elements in copper-molybdenum ore body have obvious coordinate changes in the direction of strike, tendency and vertical. While in the lead-zinc ore body, lead's variation coeffient is 0.58, and zinc's variation coeffient is 0.5, which indicates that they already have a certain randomness change in the direction of strike, tendency and vertical. Copper, molybdenum, lead and zinc, whose coefficients of grade change degree are all more than 0.9 in the direction of strike and tendency. It indicates that the ore's grade change degree is extremely complex in the ore body. The variation coeffient values of copper and molybdenum are both between 0.6 and 0.8 in the direction of vertical, showing their extent of changes are medium. And the lead and zinc's are between 0.3 and 0.6, showing that their degree of changes are relatively simple. Accordingly, we sum up the factors which control the ore body's change are mainly the cause of porphyry-skarn-type deposit, and there is a multi-stage mineralization during ore formation, to make useful minerals, ore-forming elements have a clear zoning.


Zheng W.-B.,Chengdu University of Technology | Ling Q.-F.,Chengdu University of Technology | Chang Z.-S.,China National Gold Group Corporation | Ying L.-J.,Chinese Academy of Geological Sciences | Lin B.,Chengdu University of Technology
Journal of Chengdu University of Technology (Science and Technology Edition) | Year: 2011

The successful experiences in prospecting the Jiama deposit are used to guide the further work in prospecting the region. On the basis of the detailed prospecting and investigations, the Jiama deposit has been supposed to be the most typical and complete porphyry deposit system in the Gangdisi mineralization belt. This system includes the porphyry-type molybdenum, skarn-type copper-polymetal, hornfels-type molybdenum (copper) and peripheral self-golden ore-bodies. This paper studies the porphyry-type molybdenum, skarn-type copper-polymetal and hornfels-type molybdenum ore-bodies and describes their geological features in detail. And, combined with the geological studies and the previous research results, the paper makes a brief analysis of the origin and deposition process of Jiama molybdenum. Further, it proposes a system model of the Jiama porphyry deposit and recommendes it as a method to assess the regional prospecting.


Li G.-Q.,University of Science and Technology Beijing | Hu N.-L.,University of Science and Technology Beijing | Song X.,University of Science and Technology Beijing | Song X.,China National Gold Group Corporation
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2010

In order to realize efficient development to scarce geological resources, an economic evaluation model for mineral deposits is established by taking net present values (NPV) as the objective function. The method of profit element is introduced to calculate the equivalent grades. Then, based on the three-dimensional digital deposit model, an optimization algorithm for calculating both of the optimum comprehensive cut-off grade and the break-even cut-off grade is developed when respectively directing to the objectives of a maximized NPV and the zero NPV. A practical application of the model to calculating the optimized cut-off grades has been done through a copper-molybdenum deposit case. It is approved that it can not only provide accurate economic analysis for the mine investment and production planning, but also ensure the optimal utilization of resources.

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