Sachkov and 8 co-authors reported in 2023 that specimens were analized of orthite (allanite) mineral ores obtained from the Vernadsky mine (Slyudyanka River, Irkutsk region) and Yuzhno-Bogatyrskoye occurrence (Kuznetsk Alatau). The elemental chemical composition of the ore was determined by electronic microscopy of the specimen’s surface. The study establishes that uranium and thorium in orthite ores of the Yuzhno-Bogatyrskoye occurrence are mainly represented by their separate minerals, while the content of the orthite phase in the form of their isomorphic inclusion is small.
The authors showed that the radioactive elements in orthite obtained from the Vernadsky mine are thorium and, evidently, uranium, being mainly an isomorphic inclusion in the orthite crystal lattice. A part of thorium and uranium is contained in the form of separate minerals: thorianite and uranothorianite.
Uranium and thorium in the orthite ores of the Yuzhno-Bogatyrskoye occurrence aremainly represented by their separate minerals, while the content of the orthite phase in the form of their isomorphic inclusion is small.The obtained results are consistent with the literature data. For example,Wood S.A. and Ricketts A. studied allanite-(Ce) in the Eocene Casto granite of Idaho [15]. Allanite withsigns of alteration was surrounded by grains of thorianite, and the most altered allanite was replaced by bastensite and thorianite.
The obtained results allow assuming that the major part of the radioactive inclusions in the Ortite ores of the Yuzhno-Bogatyrskoye occurrence can be removed during ore beneficiation.
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