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A Search-Oriented Method of Numerical Forecasting of Rare-Metal Proximal (Close-to-Source) Placers: Evidence from the Lovozero Placer District

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Abstract

Rare metals, including rare-earth ones, represent an important raw material that determines the scientific and technological level of industrial development, first of all, its innovative technologies. A group of loparite placers unique in genesis and mineral composition associated with the Lovozero massif of nepheline syenites (Kola Peninsula) is an important source of rare metals. In the present work, we have identified the main factors controlling the formation of proximal (close-to-source) rare-metal loparite placers within the northern periphery of the Lovozero massif, which includes the Revda placer deposit. These factors have been formalized (numerical evaluation), and multiplicative indicators allowing one to forecast the placer potential of the territory have been developed. To assess the effectiveness of the proposed technique on the basis of the developed multiplicative coefficients, independent forecasts of placer metal content for the western and eastern sites of the Revda group of placers. For additional verification of the methodology, the results obtained are compared with similar forecasts obtained by linear regression and random regression tree forest methods. The developed methodology allows to automate the process of forecasting placer parameters, which is especially important for assessing deep-seated placers that are difficult to seek and explore and are not manifested in geochemical concentrate aureoles.

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Notes

  1. Likhachev, A.S., Elnikov, E.I., Panteleimonov, V.M., and Sotemsky, V.G., Report on detailed exploration of the Shomioksky site of the Revda loparite placer deposit with reserved assessment as of July 1, 1980. PGA Sevzapgeologiya, Murmansk GSE, Apatity, 1980 (Territorial Geological Fund, no. 2823).

  2. Likhachev, A.S., Report on prospecting works in the loparite placer in the southeastern foothills of the Lovozero tundra area, Kola Peninsula (the report on of the Seidozero geological crew over 1958–1962). Northwestern Geological Survey, Kola complex expedition, settl. Revda, Murmansk oblast, 1963 (Territorial Geological Fund, no. 523).

  3. Likhachev, A.S. and Podrez, M.D., Report on the results of prospecting works in the loparite placer in the southern foothills of the Lovozero tundra area, Kola Peninsula over 1963–1966. Northwestern Geological Survey, Kola District Geological Survey, Lovozero geological crew, town of Revda, Murmansk oblast, 1967 (Territorial Geological Fund, no. 1347).

  4. Likhachev A.S., Geological note to TEOC and the calculation of provisional standards for the Revda placer deposit. PGA Sevzapgeologiya, Murmansk GSE, Apatity, 1984 (Territorial Geological Fund, no. 3226).

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Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation, project no. 13.1902.2021.0018 supervised by Acad. N.S. Bortnikov.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    R. M. Chefranov, A. V. Lalomov & A. V. Chefranova

  2. Perm State University, 614990, Perm, Russia

    A. V. Lalomov

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  1. R. M. Chefranov
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  2. A. V. Lalomov
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  3. A. V. Chefranova
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Correspondence to R. M. Chefranov, A. V. Lalomov or A. V. Chefranova.

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Translated by D. Voroschuk

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Chefranov, R.M., Lalomov, A.V. & Chefranova, A.V. A Search-Oriented Method of Numerical Forecasting of Rare-Metal Proximal (Close-to-Source) Placers: Evidence from the Lovozero Placer District. Geol. Ore Deposits 65, 133–145 (2023). https://doi.org/10.1134/S1075701523020010

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