HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau...

this study aims to investigate and optimize the effects of the main parameters including the particle size, gravity and magnetic separation combination, high gradient magnetic separation, magnetic field intensity, shaking table slope, washing water flow, and electrostatic separation upon the rare earth element (ree) recoveries from iron mine waste. the electron microprobe showed that high amoun...

The objective of this research is to determine all processes in the magmatic evolution and related hydrothermal activities that created the volcanic rocks and associated ore-forming systems of the Bafq ‎mining district. Several iron oxide-apatite (IOA) deposits were investigated in this area with a focus on the Sechahun ore deposit. The Bafq ‎mining district is well known for hosting significan...

The traditional approaches of modeling and estimation of highly skewed deposits have led to incorrect evaluations, creating challenges and risks in resource management. The low concentration of the rare earth element (REE) deposits, on one hand, and their strategic importance, on the other, enhances the necessity of multivariate modeling of these deposits. The wide variations of the grades and ...

The article provides a novel detailed petrographic, petrochemical and mineralogical description of the Talatshinskoye-2 slab stone deposit. Fergusonite was found in rocks Uraltau anticlinorium for first time. correlation studied object with other deposits carried out. An increased content alkalis revealed, which is an atypical characteristic shales eastern flank anticlinorium. contents niobium ...

1 Terrestrial Paleoclimatology Research Group, Department of Geosciences, Baylor University, Waco, TX, United States, 2 Messel Research and Mammalogy Department, Senckenberg Research Institute and Natural History Museum Frankfurt, Frankfurt, Germany, 3 Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States, 4 Department of Anthropology, University of Minnesota, Mi...

Mehredjan bentonite deposit is located ~33 km southeast of Khoor in Isfehan province. It includes 15 discrete outcrops and occurs as layered and massive forms within a volcano-clastic sequence. Bentonitization process was accompanied with development of minerals such as montmorillonite, quartz, cristobalite, calcite, kaolinite, halite, albite, orthoclase, and muscovite. The collected field and ...