Each claim states how it is known and cites its evidence.
Establishedrecognised as a deposit by the joint Fennoscandian geological surveys in Special Paper 53
Reported for this deposit
Lithoen records Korsnäs as a deposit because the Geological Survey of Finland's Fennoscandian metallogeny volume, prepared jointly by the geological surveys of Norway, Sweden, Finland and northwest Russia, treats it as one — described as a unique deposit with its host vein named, its mining period given and its ore tonnage and lead grade reported. The recognition is the surveys' own.
- assertion basis: SOURCE_REPORTED
- definition basis: Treatment as a named deposit in a national geological survey volume.
- locality: Korsnäs, westernmost Finland.
- assumption: Recognition as a deposit is a geological judgement by a survey and is not a statement that the deposit is economic.
Evidence support: Supported by the cited evidence · one source
Evidence: (ed.) 2012 · Primary authority
Establisheda calcite-diopside-barite-fluorite-allanite vein, or carbonatite dyke, cutting Svecofennian mica gneiss
Reported for this deposit
The Geological Survey of Finland describes Korsnäs as hosted by a large, north-trending calcite-diopside-barite-fluorite-allanite vein — or a carbonatite dyke — that cuts the local Svecofennian mica gneisses, and names allanite among the rare-earth minerals that made the deposit prospective for rare earths alongside its lead. The volume calls the deposit unique and notes unexploited carbonate veins or dykes 1 to 20 metres wide in its immediate vicinity.
- assertion basis: SOURCE_REPORTED
- definition basis: Host description as printed in the volume, citing Isokangas 1978 and Papunen and Lindsjö 1972.
- locality: Korsnäs, westernmost Finland.
- assumption: The volume itself leaves the vein-versus-carbonatite-dyke question open, and that openness is preserved rather than resolved here.
Evidence support: Supported by the cited evidence · one source
Evidence: (ed.) 2012 · Primary authority
Open question
Reported for this deposit
Lithoen holds no coordinate for Korsnäs. The Fennoscandian metallogeny volume locates it by naming a metallogenic area and by figures, which is not a coordinate; reading one off a published map figure would manufacture a precision the source does not carry.
- assertion basis: SOURCE_REPORTED
- definition basis: What the source provides by way of location: a named area and map figures.
- locality: Korsnäs, westernmost Finland.
- assumption: Absence of a coordinate here is a limit of this source and this corpus, not a statement that the position is unknown to anyone.
Evidence support: Supported by the cited evidence · one source
Evidence: (ed.) 2012 · Primary authority
Establisheda pilot-scale rare-earth concentrate; 0.83 per cent RE2O3 in the ore
Reported for this deposit
The rare-earth concentrate reported for Korsnäs was made at PILOT scale. The Geological Survey of Finland states that during the pilot production of a rare-earth concentrate the ore proved to contain 0.83 per cent rare-earth oxides, in a deposit mined between 1959 and 1972 for lead at 3.6 per cent across 0.87 million tonnes. A pilot concentrate is a demonstration that a concentrate can be made; the volume describes no separation of individual rare-earth oxides, and none is recorded.
- assertion basis: SOURCE_REPORTED
- definition basis: The volume's own word for the scale: pilot production. The rare-earth grade is what that pilot established about the ore.
- temporal basis: The mine worked 1959 to 1972; the volume is of 2012.
- locality: Korsnäs, westernmost Finland.
- assumption: Pilot scale is not commercial scale, and a concentrate is not a separated oxide. Nothing here establishes that individual rare-earth oxides were ever produced from this material.
Evidence support: Supported by the cited evidence · one source
Evidence: (ed.) 2012 · Primary authority
Open question
Reported for this deposit
Lithoen holds no mineral-system interpretation for Korsnäs. The volume places it in a named metallogenic area with a described geological setting, but this corpus holds no mineral-system entity matching that setting, and coining one from a single case would create a class out of an instance.
- assertion basis: SOURCE_REPORTED
- definition basis: The absence of a matching mineral-system entity in this corpus, recorded rather than left silent.
- locality: Korsnäs, westernmost Finland.
- assumption: A statement about Lithoen's coverage, not about the state of knowledge.
Evidence support: Supported by the cited evidence · one source
Evidence: (ed.) 2012 · Primary authority