A hydrometallurgical process for the recovery of cerium from Khuren khad ore

This study presents the recovery of cerium (Ce) from Khuren Khad ore by using the hydrometallurgical process. Several methods of leaching and precipitation were employed to investigate the recovery efficiency of Ce from the ore. According to the result, it is 4.8% of Ce contained in this ore sample. The best result of this study reveals that 100% Ce leaching efficiency can be obtained under leaching conditions of 6N HCl at a temperature of 70° C and 5g/50mL solid/liquid ratio and 3h. Further, 99.60% precipitation recovery of Ce was achieved with NaHCO3 at an interval of 24 hours. After leaching and precipitation, the concentration of Ce was enriched from 4.8% of Khuren Khad ore to 33.09% of precipitation product

Geology, Mineralization and Magma Evolution of the Zuun Mod Mo-Cu Deposit in Southwest Mongolia

Zuun Mod is a Porphyry-Type Mo-Cu Deposit Located in the Edren Terrane in Southwest Mongolia. the Deposit Has Estimated Resources of 218 Mt with an Average Mo Grade of 0.057% and Cu Grade of 0.069%, and Significant Amounts of Re. the Deposit is Characterized by Multiple Pulses of Magmatism and Exsolution of Magmatic Ore Fluids and Associated Alteration and Mineralization. the Timing of These Events and the Tectonic Environment Were Unconstrained, and the Deposit\u27s Origin Remains Controversial. based on Drill Core and Field Examinations, Four Lithological Units of the Bayanbulag Intrusive Complex Are Identified in the Deposit Area Including Quartz Syenite, Quartz Monzonite, Granodiorite, and Granite. the Majority of Mo Mineralization at Zuun Mod Occurs in Sheeted and Stockwork Quartz Veins that Crosscut Units of the Bayanbulag Complex as Well as Disseminations within Altered Granitoids Wherein the Mineralized Quartz Veins Occur with Potassic and Phyllic Alteration Selvages. Zircon U-Pb Age Dating for Quartz Monzonite and Granodiorite Defined the Timing of Magmatic Events at 305.3 ± 3.6 Ma and 301.8 ± 2.7 Ma, Respectively. Molybdenite Re-Os Geochronology on Grains from a Quartz Vein with Potassic Alteration Selvage Determined the Age of Mo Mineralization at 297 ± 4.8 Ma. Lithogeochemical Data of Intrusive Units Suggest the Granitoid Rocks Show Calc-Alkaline to High-K Calc-Alkaline, I-Type, and Metaluminous to Slightly Peraluminous Affinities that Formed in a Post-Collisional Setting and Were Likely Sourced from Subduction-Modified Lithosphere. Lithogeochemical Signatures and the Tectonic Environment Classify Zuun Mod into Neither Climax Nor Endako-Types, But as a Mo-Rich Porphyry Cu Deposit

Results of Epizootiological Survey along the Border Areas of Kharkhira-Turgensky Natural Plague Focus between Russia and Mongolia in 2019

Objective of the study was to assess the current epizootic settings along the border part of KharkhiraTurgensky natural plague focus betweenRussia andMongolia.Materials and methods. Epizootiological survey covered 2715.5 km2. 213 samples of field material were tested (90 specimens of mammals, 102 specimens of ectoparasites, 17 samples of leftover food of predatory birds and dry skeletal remnants of marmots, 4 regurgitates of birds of prey). Laboratory works were carried out in “Microbiological laboratory for express diagnostics” mounted on the platform of the minibus “GAZelle”. Tests of field material were performed using immune-chromatographic (IC) assay and polymerase chain reaction (PCR). PCR and IC positive samples were further investigated applying bacteriological method. Epizootiological surveyed deployed GIS instruments. All the results obtained were plotted on the electronic maps using QGIS 2.18.26 software.Results and discussion. Capsular antigen (F1) of Yersinia pestis was detected in three (1.4 %) studied samples (n=213), DNA of plague microbe – in eight samples (3.7 %). Bacteriological investigation of positive samples revealed one sample (leftover food of predatory birds – Mongolian marmot) from which plague agent culture was isolated. The culture belonged to Y. pestis of the main subspecies. Geographical positioning of the epizootiological survey sites was conducted, as well as positive findings of immunological and molecular-genetic assays. Results of epizootiological survey are indicative of active phase of plague agent circulation (main subspecies) in Kharkhira-Turgensky natural focus in Mongolia