Founded 1934 by Prof. Dr Stefan Bončev
A Geo-Sciences Journal of the Geological Institute “Strashimir Dimitrov”, Bulgarian Academy of Sciences
Official Journal of the Carpathian-Balkan Geological Association

Gergana Velyanova

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria; National Centre of Excellence Mechatronics and Clean Technologies, 8 bul. Kliment Ohridski, P.C. 1756, Sofia, Bulgaria
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Mariya Georgieva

Occurrence of critical elements in biomass ashes and their potential industrial and ecological significance: A preliminary critical overview

Volume 55 3 December 2026

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria; National Centre of Excellence Mechatronics and Clean Technologies, 8 Boulevard Kliment Ohridski, Sofia 1756, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria

Preliminary evaluation on the occurrence of critical elements in Bulgarian coal fly ashes and their potential industrial significance

Volume 54 3 December 2025

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Vilma Petkova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria

Occurrence of nutrient and contaminant elements in biomass ashes and their significance for potential soil fertilization

Volume 54 2 August 2025

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 107, Sofia 1113, Bulgaria
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Lora Bidzhova
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 24, Sofia 1113, Bulgaria
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Svetoslav Georgiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Street, Block 24, Sofia 1113, Bulgaria

Content, association and modes of occurrence of mercury in biomass ashes and its behaviour during biomass combustion

Volume 54 1 April 2025

Stanislav Vassilev
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria
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Christina Vassileva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria
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Mariya Georgieva
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria
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Borislav Barbov
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria
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Gergana Velyanova
Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 107, 1113 Sofia, Bulgaria
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Svetoslav Georgiev
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Content, association and potential modes of occurrence of mercury in diverse biomass types and their ecological significance

Volume 53 2 August 2024

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