Editorial: Ereen gold ore deposit in Mongolia in search of a mine developer

Nov 2017 / by P. K. Chanda

The Ereen gold ore deposit located at Mandal Soum of Selenge Province, in North Khentei, Mongolia shows the potential at a depth of mineralization using the elevation of Gatsuurt as a guide to possible depth extent of mineralization. The North Khentei gold belt has a long history of placer mining and includes gold reserves in both placer and bedrock deposits. Gold placer deposits form a series of geographically distinct placer districts primarily located in the vicinity of the bounding faults of North Khentei trend.

The preliminary exploration has just been carried out at the deposit where resource estimation achieved indicates a possible medium scale mine. However, exploration region only covered a small area of the licensed area indicating that there are potentials on the escalation of the resource estimation. The project feasibility study has not been submitted to the concerned authority; cut-off grade has not been finalized as it requires thorough economic and technical studies. The study reveals that the project is favourable for opencast mining as the current engineering geology and hydrogeology studies are still very basic and cannot satisfy the mine design requirements. Therefore, the project is on hold due to economic and logistic reasons.

The Journal of Mines, Metals & Fuels seeks to highlight through this special issue covering geological features and prospecting of this gold ore deposit; mining assessment; study on the heavy metals in soil in different functional zones; characteristics of mineral alteration and weathering in the areas; digitizing and 3D model establishment; design strategies of soil and water conservation measures and drilling analysis and prospecting prediction. The salient features given in the special issue hopefully may help in attracting potential developer of this high grade gold ore deposit.

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Study on the heavy metals in soil in different functional zones of Ereen

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

Using plasma emission spectrometer and atom atomic fluorescence spectrometry analysis and the heavy metals of the soil samples, which are scientifically collected in business zone, living zone, agricultural zone and industrial zone of Ereen. The results show that different functional zones of Ereen present different distribution characteristics of heavy metals in soil, As, Cd, Cu, Hg , Zn of industrial zone and Cd in business zone, living zone and agricultural zone are all exceed the national soil environmental quality standards. The content of heavy metals in upper soil is higher than in the subsoil in the study area, which shows that artificial external pollution input potential influence on the soil of Ereen. Agricultural zone of Ereen is less pollution, industrial zone is polluted seriously, commercial and residential both achieve the moderate pollution, thus should strengthen scientific control and governance.
Keywords: Ereen, different functional zones, heavy metals, distribution characteristics

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Geological features and prospecting of Ereen gold ore deposit in Mandal Soum, Selenge province, Mongolia

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

The Ereen deposit lies within the North Khentei gold belt which is bounded by the north-west by the Bayangol fault system and by the south-east by the Yeroogol (or Sujigtei) fault system. Both fault systems have a similar south-westnorth- east trend (generally NE45°). Faults are of east-west, north-south and north-western direction. Regional scale is north-easterly trending. Sujigtei fault controls position of the large-scale Gatsuurt gold deposit. Ereen occurs inside regional magnetic anomaly. The average size of visible Au is reported to be 1mm. Results of combined IP (induced polarization), magnetic surveys and gold in soil anomalies and l48 diamond drillholes in the Ereen area show an anomaly to the south-east of the drilled area and remains to be tested as it did a similar anomaly on the Baavgait license. Ereen gold deposit shows the potential at depth of mineralization using the elevation of Gatsuurt as a guide to possible depth extent of mineralization.
Keywords: Ereen deposit, induced polarization, gold, prospecting

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Mining assessment of Ereen gold ore in Mandal Soum, Selenge province Mongolia

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

The Ereen deposit lies within the North Khentei gold belt, which is bounded by the north-west by the Bayangol fault system and to the south-east by the Yeroogol (or Sujigtei) fault system. The preliminary exploration has just been conducted at the deposit, where the resource estimation achieved indicates a possible médium-scale mine, cut-off grade has not been finalized and therefore the mining boundary cannot be defined. The cut-off grade will be achieved by thorough economic and technical study. The findings from the site visit and the current exploration are favourable for open pit mining; however, the parameters for the pit development will need to be included in the project feasibility study and mine design in the future. The current engineering geology and hydrogeology study are still very basic and cannot satisfy the mine design requirements in the future. For the future mining operation, the company needs to engage in a contract with the local electricity supply. The site visit found that water supply seems sufficient.
Keywords: Ereen deposit, mining assessment, gold, prospecting

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Characteristics of mineral alteration and weathering in Ereen gold ore in Mandal Soum, Selenge province, Mongolia

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

The Ereen deposit lies within the North Khentei gold belt, which is bounded to the north-west by the Bayangol fault system and to the south-east by the Yeroogol (or Sujigtei) fault system. Both fault systems have a similar south-westnorth- east trend (generally NE45°) faults of east-west, north-south and north-western direction; regional scale north-easterly trending Sujigtei fault controls position of the large-scale Gatsuurt gold deposit. The gold mineralization in Ereen deposit is confined spatially with hydrothermal alteration of rhyolite, Ereen deposit area was affected by three tectonic and consecutively, three hydrothermal alteration cycles.The Ereen southern mineralized zone is characterized by extensive quartz veining and a series of ore bodies with similar east-north-easterly striking and southeast dip direction, but the northern zone is different.
Keywords: Ereen deposit, alteration, weathering, gold

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Digitizing and three-dimensional model establishment for Ereen gold ore deposit in Mandal Soum, Selenge province, Mongolia

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

The Mineral Mathematical Model Software and Micromine Software from abroad for digitization analysis were used to study some of the mines in Ereen gold mine in Mandal Soum, Selenge province, Mongolia. This study dealt with: primitive database construction, sample statistical analysis, lithology modelling, variation function, grade modelling, etc. Finally,a three-dimensional space model of ore bodies was established, on the basis of this mineral mathematical model.These results of digitization research enormously make the mine production management become more convenient, and have provided the scientific basis for mine prospecting project design, mining engineering design and economic evaluation.
Keywords: Ereen deposit, digitization, three-dimensional model

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Design strategies of soil and water conservation measures for Ereen gold deposit in Mandal Soum, Selenge province, Mongolia – a case study

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

The objective of this environmental due diligence review is to identify and or verify the existing and potential environmental liabilities and risks, and assess any associated proposed remediation measures for the Ereen gold mine. The results show that area of soil and water conservation measure was produced prior to 5 measures mentioned above, belong to a positive design process, closing hillside of which has been decided lately, other 4 measures were produced between these two factors. The four measures were not been decided simultaneously, have the trend of building soil and water conservation forest and building economic forest prior to terracing and conservation tillage, but they are independent to each other, belong to parallel coupled design. Conservation tillage, terracing, building economic forest, building soil and water conservation forest account for 31%,12%,21%,24% of area of soil and water conservation measure, which has some change extent.
Keywords: Ereen deposit, digitization, three-dimensional model

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Drilling analysis and prospecting prediction of Ereen gold ore in Mandal Soum, Selenge province, Mongolia

Nov 2017 / by Yang Wu, Zhang Min and Mao Kainan

The Ereen deposit lies within the North Khentei gold belt. The exploration works undertaken at Ereen have shown significant mineralization in and around the existing known vein gold mineralization. Work to date has delineated a mesothermal quartz vein system with volcanic-hosted disseminated mineralization associated with quartz-sericite carbonate and intensive silicification alteration zones. The area has approximate dimensions of 750 × 650m and assay results indicate gold mineralization averaging 1.7g/t. Geophysical and geochemical data appear coincident, though drilling has shown that it is the gradient areas of the IP anomalies which appear most prospective. This has meant that some early holes did not intersect mineralization, but the more recent holes have been better targeted.
Keywords: Ereen deposit, prospecting prediction, gold, drillings

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