The Zazhoginskoe deposit by the numbers: 25 separate ore bodies, 0.2 to 58 million tons each, in a 9000 km² basin holding 250 billion tons of organic matter

The deposit

The Zazhoginskoe deposit (Зажогинское месторождение) is the principal Russian-state-registered shungite-bearing rock deposit, located 1.7 km from the western shore of Lake Onega at the village of Tolvuya, Medvezhyegorsk district, Republic of Karelia. The deposit is the modern operational shungite-mining site, currently extracted by the Karbon-Shungit company (founded 2013).

The Zazhoginskoe deposit is the surface-and-near-surface expression of a much larger geological structure: the Onega Basin, a Paleoproterozoic (2.1-1.92 billion years old) sedimentary-and-volcanic basin underlying approximately 9,000 km² of central-southern Karelian territory. The basin contains an estimated 25 × 10¹⁰ tons (250 billion tons) of preserved Precambrian organic matter, one of the largest such accumulations known anywhere on Earth.

The Zazhoginskoe deposit and its sister deposits at Maksovskoye, Shunga, and several smaller sites are therefore the surface-mineable fragments of a planet-scale anomaly in the preserved-organic-matter record.

The 25 ore bodies

Within the Zazhoginskoe deposit boundary, Russian-academic survey work (Deynes et al. 2021, Karelian Research Centre RAS) has identified 25 separate ore bodies (залежи) of high-carbon shungite-bearing rock. The 25 bodies vary in size from 0.2 million tons (the smallest catalogued body) to 58.0 million tons (the largest catalogued body) of high-carbon shungite-bearing rock material.

The two principal bodies named in the modern Russian-academic literature:

- Zazhoginskaya (Зажогинская залежь), approximately 5 million tons of high-carbon shungite-bearing rock
- Maksovskaya (Максовская залежь), approximately 30 million tons of high-carbon shungite-bearing rock, structurally an anticlinal fold up to 120 metres thick in its central section. The Maksovskaya body is the thickest single shungite-rock-fold structure documented in the deposit

The 25-body inventory means that "the Karelian shungite deposit" is not a single homogeneous body but a cluster of separate sub-deposits, each with its own geometry, depth profile, and carbon-content range. The mining operation extracts from selected bodies based on accessibility, carbon-content requirements, and current demand.

Carbon-content classification

Russian-mineralogical practice classifies shungite-bearing rocks into categories by free-carbon content:

- Less than 10% free carbon, low-carbon variant, used as porous-aggregate feedstock for the шунгизит (shungizite) construction-material industry (covered in the shungizite concrete thread elsewhere in this forum); this is the variant extracted at the Nigozero deposit in Kondopoga
- 10-20% free carbon, intermediate variant, mixed-use applications
- 20-80% free carbon, the principal high-carbon variant, the variant extracted at the Zazhoginskoe-Maksovskoye-Shunga deposits and used in the modern shungite-water-purification, shungite-stone, and shungite-pigment trade
- More than 80% free carbon, the highest-carbon variant, sometimes called "elite" or "noble" shungite (шунгит I) in the Russian trade-classification, occurring as veins and small specimen-pieces rather than bulk-mineable horizons

The 25 ore bodies at Zazhoginskoe span the 20-80% free-carbon range, with a mean free-carbon content varying body-by-body. The Zazhoginskoe bulk extraction is principally in the 30-50% free-carbon range; the higher-carbon material is selectively quarried for specialty markets.

Industrial-extraction history

The industrial-extraction timeline for the Zazhoginskoe and adjacent Karelian shungite deposits, with hard dates:

- 1928-1937, Trust "Shungit" (Soviet state-research-and-extraction enterprise) operates at the Shunga deposit. First Soviet-period industrial extraction begins 1932-1933. Closure 1937. (Covered in the Soviet trust thread elsewhere in this forum.)
- 1937-1972, 35-year gap with no permanent industrial-scale extraction; research continues at the Karelian Research Centre RAS (Borisov, Kalinin, and successors)
- 1972, first permanent industrial-scale extraction begins at the Nigozero deposit in Kondopoga, producing low-carbon shale feedstock for шунгизит (shungizite) porous-aggregate manufacturing. This is a separate deposit from Zazhoginskoe, with different rock properties; the Nigozero variant is approximately 1% carbon, suitable only for the construction-aggregate market
- 1980s-1990s, Zazhoginskoe deposit explored and characterised in detail; the 25-body inventory established
- 2013, modern operator Karbon-Shungit (Карбон-Шунгит) founded; sustained Zazhoginskoe extraction begins under post-Soviet commercial-operator framework
- 2014-present, continuous fractional-shungite-rock production from Zazhoginskoe deposit for the global trade

The high-carbon shungite-bearing rock that the modern shungite-water-purification, shungite-pigment, and shungite-stone trade depends on therefore comes from a deposit that only entered sustained commercial production approximately a decade ago, after a research-and-prospecting history stretching back to Inostrantsev's 1879 fieldwork.

Type-locality status and conservation

The Shunga type-locality (the original Inostrantsev sample-site) is now a 10-hectare protected site (covered in the Karelian shungite type locality thread elsewhere in this forum). Visitors can walk on the type-locality outcrop but cannot legally chip a sample from it. The actual modern industrial extraction is at Zazhoginskoe-Maksovskoye, several kilometres north of the protected Shunga site.

The conservation-and-extraction split is a pragmatic Russian-state arrangement: the original 19th-century-defined type-locality is protected for scientific-historical-and-tourism purposes, while the modern extraction takes place in the same general geological structure but in different ore-body locations several kilometres away. The protected type-locality and the operational quarry are part of the same Onega-Basin geological system.

Where the trail leads

For the modern Russian-academic survey of the deposit:

- Deynes Yu.E., Kovalevsky V.V., Pervunina A.V., Romashkin A.E., Rychanchik D.V., Ieshko E.P. (2021), "Шунгитовые породы Карелии: от геологических исследований к перспективам использования в инновационных технологиях" [Shungite Rocks of Karelia: from Geological Studies to Prospects of Innovative Technological Use], Trudy Karelian Research Centre RAS № 7, pp. 72-88, DOI 10.17076/them1426: cyberleninka.ru

For the deposit-and-mining reference pages:

- Wiki-Karelia reference on the Zazhoginskoe deposit, with the historical-and-current operational context: wiki-karelia.ru
- Webmineral mineralogical reference on the Zazhoginskoe deposit, with the body-inventory specifications: webmineral.ru
- Karbon-Shungit modern operating company official site: shungitnpk.ru
- Karelian Research Centre RAS Department of Mineral Resources reference page (Недра Карелии. Шунгит): nedrark.karelia.ru

For the broader Onega-Basin geological-research literature:

- Filippov M.M. (2002), Шунгитоносные породы Онежской структуры [Shungite-bearing rocks of the Onega structure], Karelian Research Centre RAS, 280 pp., the foundational modern Russian-academic reference monograph on the basin

Sources

- Deynes et al. 2021, Trudy KarNTs RAN No. 7, pp. 72-88: the 25-body inventory, the 0.2-58 million tons range, the Zazhoginskaya 5 Mt and Maksovskaya 30 Mt body-specific reserves, the 9000 km² basin area, the 25 × 10¹⁰ tons organic-matter estimate, the 2.1-1.92 billion year age, the carbon-content classification system, the 1972 Kondopoga industrial-extraction-restart date
- Wiki-Karelia and Webmineral mineralogical-reference databases for the deposit-location specifics (1.7 km from Lake Onega shore, Tolvuya village, Medvezhyegorsk district)
- See the Onega Parametric Borehole thread for the deep-drilling characterisation of the basin structure
- See the Soviet trust thread for the 1928-1937 trust-period industrial-extraction history
- See the Soviet uranium exploration thread for the 1954-1987 radiometric-survey programme over the deposit territory
- See the Karelian shungite type locality thread for the protected-status of the Shunga site
- See the shungizite concrete thread for the 1972 Kondopoga / Nigozero low-carbon construction-aggregate operation

Editor's note (2026 audit): Karbon-Shungit '2013' founding date is in tension with company's '1991' framing on shungitnpk.ru/en/company. May refer to a corporate restructuring date. Suggested edit: Clarify that 2013 may be a corporate-restructuring date, not the original operation start (1991).

Edited 2026-05-03, source audit. Cited sources verified to exist; no fabricated sources detected. Where the audit could directly read the source (live English-language papers, open Russian academic articles), claims were compared against the source content and corrections applied above. Where sources were paywalled or geo-blocked at audit time, bibliographic plausibility was verified via parallel routes (publisher index pages, PubMed/PMC mirrors, cross-citations) but the source content itself was not always directly read. If a specific claim matters to you, click the source link and verify it yourself.