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Yu J.-J.,Chinese Academy of Geological Sciences | Wang T.-Z.,Chinese Academy of Geological Sciences | Che L.-R.,Sino mine Resource Exploration Co. Ltd | Lu B.-C.,China University of Geosciences
Ore Geology Reviews | Year: 2016

The Tongjing Cu-Au deposit is a medium-sized deposit within the Ningwu volcanic basin, east China, and is hosted by Cretaceous volcanic rocks of the Dawangshan and Niangniangshan Formations. The veined and lenticular Cu-Au orebodies are spatially and temporally related to the volcanic and subvolcanic rocks of the Niangniangshan Formation in the ore district. The wall-rock alteration is dominated by silicification, siderite alteration, carbonation, sericitization, chloritization, and kaolinization. On the basis of field evidence and petrographic observations, two stages of mineralization are recognized: (1) a siderite-quartz-sulfide stage (Stage 1) associated with the formation of chalcopyrite and pyrite in a quartz and siderite gangue; and (2) a quartz-bornite stage (Stage 2) cutting the Stage 1 phases. Stage 1 is the main mineralization stage. Quartz that formed in Stage 1 has δ18OH2O values of -4.3‰ to 3.5‰ with δD values of fluid inclusion waters of -97.1‰ to -49.9‰, indicating that the ore-forming fluids were derived from early magmatic fluids and may have experienced oxygen isotopic exchange with meteoric water during Stage 1 mineralization.LA-MC-ICP-MS zircon U-Pb dating of the mineralization-related nosean-bearing phonolite and nosean-bearing phonolitic brecciated tuff at Tongjing yields ages of 129.8 ± 0.5 Ma and 128.9 ± 1.1 Ma, respectively. These results are interpreted as the crystallization age of the volcanic rocks of the Niangniangshan Formation. A hydrothermal sericite sample associated with Cu-Au mineralization at Tongjing yields a plateau 40Ar-39Ar age of 131.3 ± 1.3 Ma. These results confirm a genetic link between the volcanism and associated Cu-Au mineralization. The Tongjing Cu-Au deposit in the Ningwu basin is genetically and possibly tectonically similar to alkaline intrusion-related gold deposits elsewhere in the world. © 2016 Elsevier B.V.

Shi D.,Key Laboratory on Deep Geological Drilling Technology | Xiao J.,MCC Communication Engineering Technology Co. | Yang C.,Key Laboratory on Deep Geological Drilling Technology | Yang C.,Sino mine Resource Exploration Co. | Liu B.,Key Laboratory on Deep Geological Drilling Technology
Procedia Engineering | Year: 2014

This paper deduced the cavity geometry of the plate under the action of one-way and two-way squeeze equipment which is hyperbolic for two-way squeezed, hyperbolic and arc for one-way squeezed. This paper points out the different stress characteristics and applicable conditions of bearing plate for the two kinds of squeezed branch pile, and provides references for the development of the squeezed branch pile. © 2014 Published by Elsevier Ltd.

Li Z.-J.,Beijing University of Technology | Wang Y.,Beijing University of Technology | Liu B.-L.,Beijing University of Technology | Yang C.,Beijing University of Technology | Yang C.,Sinomine Resource Exploration Co.
Advances in Materials Science and Engineering | Year: 2015

A glass-like casing was developed to mend the instable borehole due to its great similarities in compositions and structure. In order to boost the casing's mechanical properties and lower its cost, different wt% additions of aluminum and quartz sand are added into the composition. Based on the outcomes of differential scanning calorimeter (DSC), it is suggested to be sintered at the temperature of 700°C. The results of X-ray diffraction (XRD) show that aluminum and SiOare its main crystalline phases. Its compression strength and the tensile strength range 5-14 Mpa and 0.5-4.5 Mpa, respectively, with the relative densities of between 1.00 g/cm3 and 1.19 g/cm3. In the end, a glass-based formula with 30 wt% aluminum and 40 wt% quartz sand is developed and experimentally applied. © 2015 Zhi-jun Li et al.

Li W.-G.,Sinomine Resource Exploration Co. | Wang T.-G.,Nanjing Center | Yao Z.-Y.,Nanjing Center | Li H.-J.,Nanjing Center | Zhu Y.-P.,Nanjing Center
Geological Bulletin of China | Year: 2014

Epithermal gold deposits related to alkaline rocks possess a significant place in global metallogenic belts, especially in the Circum-Pacific metallogenic belt. Among them, the Porgera gold deposit located in the New Guinea orogenic belt is a typical deposit. The mineralization of the deposit is associated with alkaline Porgera intrusive complex and mostly occurs in the contact zone between the rock mass and the strata of Cretaceous Chim Formation. The ore-forming process can be divided into two stages, and the mineralization styles includes vein mineralization and breccia mineralization. The metallogenic materials and fluids of the deposit exhibit the characteristics of magma resources. The age of mineralization-related Porgera complex intrusion is 5.99Ma, which is consistent with the metallogenic epoch, and the magma of the intrusion originated from the metasomatic-enrichment type upper mantle. This kind of alkaline magma played an important role in gold concentration. The ore-controlling factors and indicators for the exploration of the deposits are summarized in this paper, which can provide guidance in search of similar deposits for China's mining enterprises.

Xu M.,Nanjing Center | Li H.-J.,Nanjing Center | Bai J.,Sinomine Resource Exploration Co. | Zhao X.-D.,Nanjing Center | Guo W.-M.,Nanjing Center
Geological Bulletin of China | Year: 2014

The Fiji platform has a thick, youthful crust of ensimatic origin,and its metallization is related to tectonic evolution. Stratigraphy within the Fiji Islands indicates a history restricted to the Cenozoic, with volcanic rocks, principally submarine fragmental types with related sediments, dominating the succession. There are also carbonate sediments and plutonic rocks of gabbroic to tonalitic composition which were intruded during an important middle to late Miocene tectonic event. Mineral deposits in Fiji Islands include various types of massive sulfide deposits, porphyry Cu-Au deposits, skarn deposits, epithermal Au deposits, sedimentary manganese deposits, residual deposits and placer deposits. Four distinct stages in the development of Fiji Islands have been identified. These stages are related to changes in tectonic development and are reflected in the spatial land temporal distribution of various styles of mineralization presently found across Fiji Islands.

Chen G.,Nanjing Center | Yao Z.-Y.,Nanjing Center | Wang T.-G.,Nanjing Center | Gao W.-H.,Nanjing Center | And 2 more authors.
Geological Bulletin of China | Year: 2014

Based on the database of the standards, construction process, data quality control measures and methods and processes, the authors constructed the databases of Fe, Mn, Cu, Al, Au, Ni, U and REE mineral resources for Oceanian region. Through a comprehensive analysis of the multi-source data information of geology and mineral resources, the regional metallogenic regularity was summarized, and the basic data were provided for mineral resources prediction. The database management system formed in this way makes the data management and inquiry more convenient, the expression more intuitive, and the analysis and summarization more effective.

Yao Z.-Y.,Nanjing Center | Wang T.-G.,Nanjing Center | Zhang J.-W.,Sinomine Resource Exploration Co. | Chen G.,Nanjing Center | Li H.-J.,Nanjing Center
Geological Bulletin of China | Year: 2014

Based on a preliminary investigation of the metallogenic geological background of superior mineral resources, features of metallogenic zones (belts), deposit types and resources potentials in Oceania, the authors analyzed the present situation of the going aboard strategy of the Chinese geological prospecting enterprises and the investment environment of Australia, Papua New Guinea and some other countries. Australia and Papua New Guinea possess huge reserves of Fe, Mn, Cu, Al and Ni as well as ores with strategic significance such as Au, U and rare earth, and these mineral resources are complementary to China's domestic demand for mineral resources. Thus, these mineral resources in Australia and Papua New Guinea seem to be the ideal deposit mining projects for the Chinese mining companies wishing to look for developing chances aboard. At last, some suggestions for either long-term or short-term going abroad strategy are put forward based on previous work experience gained by the authors.

Song X.-X.,Sinomine Resource Exploration Co. | Xin D.,Sinomine Resource Exploration Co. | Wang T.-G.,Nanjing Center | Sui X.,Sinomine Resource Exploration Co. | And 2 more authors.
Geological Bulletin of China | Year: 2014

The Papua New Guinea region evolved within the obliquely and rapidly converging Australian and Pacific plate boundary zone. It is arguably one of the most tectonically complex regions in the world, and its geodynamic evolution involved subduction and formation of volcanic (magmatic) arcs, arc-continent collision and collisional orogenesis, exhumation of continental crust, magmatic intrusion and mineralization. The geochronology of New Guinea suggests the geodynamic sequence of (1) collision causing uplift and exhumation, then (2)intrusion during or shortly after exhumation, and finally (3)mineralizing event during the late stages of the intrusive system. In the geodynamic sequence, ages of Cu-Au mineralization are mainly concentrated in the range of 25~0Ma. Most of the world class deposits in PNG are much younger (6~0Ma). On the basis of ages of mineralization, the authors divide Cu-Au mineralization into the three boom periods: the first boom of mineralization (23~12Ma); the second boom of mineralization (7~1Ma); the third boom of mineralization (0.5~0Ma) (still continuous at present). The controlling factors of Cu-Au mineralization in Papua New Guinea include tectonics, intrusive complex, special host strata, transfer structure, folds, various faults, caldera or diatreme and so on. In summary, Papua New Guinea has a relatively young (Meso-Cenozoic) and complex history of tectonic and metallogenic evolution with plate convergence, collisional orogenesis, and strong and frequent magmatic-hydrothermal activities, including Cu-Au mineralization.

Liu L.,Central South University | Zhang S.,Central South University | Liu L.,Sinomine Resource Exploration Co.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2014

According to the deficiencies of the commonly used methods in slope stability analysis, the AHP-ideal point model was introduced to the stability gradation of rock slope. Topography, mechanical properties and structure, climate and other factors were taken into account in this model so that the cohesion, internal fiction angel, slope angel, slope height, the maximum seismic intensity and the maximum process rainfall were chosen as the evaluating indicators weighted by AHP(analytic hierarchy process). The basic idea of this model was to construct ideal point evaluating function and determine the ideal point close degrees of all the rock slope stability gradations. Then, the stability gradation of rock slope was close to the gradation whose close degree was smaller. Finally, the model was applied in the actual engineering. The results show that the unstable and highly unstable close degrees are 0.400 and 0.339, respectively. Therefore, the actual rock slope is from unstable to highly unstable, which is in accordance with the actual situation. The model has higher reliability and practicability, which provides a new idea and method for stability gradation of rock slope. ©, 2014, Central South University of Technology. All right reserved.

Xin D.,Sinomine Resource Exploration Co. | Liu J.,Sinomine Resource Exploration Co. | Li L.,Sinomine Resource Exploration Co. | Ran L.,Sinomine Resource Exploration Co. | Song X.-X.,Sinomine Resource Exploration Co.
Geological Bulletin of China | Year: 2014

Lying in Mt Fubilan of West Papua New Guinea, the Ok Tedi deposit is a world class copper-gold deposit. Tectonically, it belongs to the Papua fold belt of the New Guinea Orogenic belt. Copper-gold mineralization of the deposit occurs in the Fubilan monzonite porphyry, and its surrounding magnetite skarn and sulfide skarn. The primary sulfide ores which are composed of such minerals as magnetite, pyrite, pyrrhotite, marcasite, chalcopyrite and chalcocite constitute the predominant ore type. There exists a secondary oxidation-secondary enrichment zone in the deposit. The alteration types include skarnization, potassic alteration, argillic alteration and propylitic alteration. The supergene ore minerals include digenite, chalcocite, native copper, covellite and electrum. Mineralization is mainly controlled by regional structures, intrusive complex, limestones of the Darai Formation and faults. According to the features of host rock, ore and alteration as well as the controlling factors of mineralization, the authors classify the Ok Tedi deposit as a typical skarn-porphyry Cu-Au deposit.

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