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LITHOEN

Deposit

Tellnes

Also known as Tellnes ilmenite deposit, Tellnes Ti-rich noritic ore body

A titanium deposit in the Rogaland Anorthosite Province of southwestern Norway, described by the Geological Survey of Finland's Fennoscandian metallogeny volume as a Ti-rich noritic ore body almost 3 km long and more than 400 m wide. Its average modal composition is reported as 53 volume per cent plagioclase, 29 volume per cent hemo-ilmenite and 10 volume per cent orthopyroxene.

Classification

recognition basis
geologicalSurveyPublication
realm
europe

What this record is, and who says so

Recognised on the basis of

Geological survey publication

A report or map published by a national or regional geological survey.

A deposit is an occurrence of sufficient size and grade that it might, under the most favourable circumstances, be considered to have economic potential. Lithoen records that a named authority made that judgement. It is not a statement that anything here is recoverable, and it is not a resource or a reserve.

Commodities documented here

Where it is

Lithoen holds no coordinate for Tellnes. The Fennoscandian metallogeny volume locates it by naming the Rogaland Anorthosite Province of southwestern Norway, by figures including cross sections and a photograph of the open pit, and by giving the ore body's dimensions — almost 3 km long and more than 400 m wide. None of that is a coordinate, and reading one off a published figure would manufacture a precision the source does not carry.

How this record is known

4
Settled consensus
Cited as the accepted position of the discipline.
2
Open questions
Sourced statements that the answer is not currently known.

6 of 6 claims on this page cite at least one registered source. Counts describe how each statement is known, not how likely it is to be true.

What Lithoen records

Each claim states how it is known and cites its evidence.

Establisheddistinctly different ilmenite in one province: hemo-ilmenite with lamellae at Tellnes, homogeneous ilmenite at Bjerkreim-Sokndal

Reported for this deposit

Ilmenite from the neighbouring Bjerkreim-Sokndal layered intrusion is, in the same survey volume, usually homogeneous and without the hematite exsolution lamellae that characterise Tellnes hemo-ilmenite, and carries 1 to 2.5 per cent MgO against Tellnes's 3 to 4 per cent. Two bodies in one province therefore yield ilmenite that the source itself calls distinctly different on the two features it names as controlling concentrate grade and acid dissolution. A mineral name does not fix how a feed behaves.

  • assertion basis: SOURCE_REPORTED
  • definition basis: A contrast the source draws explicitly, in the sentence that calls the two distinctly different.
  • locality: The Rogaland Anorthosite Province, southwestern Norway.
  • assumption: This asserts nothing about how Bjerkreim-Sokndal ilmenite would perform in any process. The source states a mineralogical difference; nobody has reported the processing consequence.

Evidence support: Supported by the cited evidence one source

Evidence: (ed.) 2012 Primary authority

Establishedrecognised as a deposit by the joint Fennoscandian geological surveys in Special Paper 53

Reported for this deposit

Lithoen records Tellnes as a deposit because the Geological Survey of Finland's Fennoscandian metallogeny volume, prepared by the geological surveys of Norway, Sweden, Finland and northwest Russia, treats it as one in its account of metallogenic areas in Norway — describing its ore body, its modal composition, its mined tonnage and its reserves. The recognition is the surveys' own; Lithoen makes no such judgement.

  • assertion basis: SOURCE_REPORTED
  • definition basis: Treatment as a named deposit in a national geological survey volume, with a described ore body and reported tonnage.
  • locality: Rogaland Anorthosite Province, southwestern Norway.
  • assumption: Recognition as a deposit is a geological judgement by a survey. It is not a statement that the deposit is economic, and the mine's existence is a separate fact from the deposit's recognition.

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 Tellnes. The Fennoscandian metallogeny volume locates it by naming the Rogaland Anorthosite Province of southwestern Norway, by figures including cross sections and a photograph of the open pit, and by giving the ore body's dimensions — almost 3 km long and more than 400 m wide. None of that is a coordinate, and reading one off a published 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 province, figures, and body dimensions.
  • locality: Rogaland Anorthosite Province, southwestern Norway.
  • assumption: Absence of a coordinate here is a limit of this source and of this corpus, not a statement that the deposit's position is unknown to anyone.

Evidence support: Supported by the cited evidence one source

Evidence: (ed.) 2012 Primary authority

Established44 to 45 per cent TiO2 in the standard concentrate, against 52.8 per cent stoichiometric, for mineralogical reasons

Reported for this deposit

The Geological Survey of Finland attributes the TiO2 content of the standard Tellnes ilmenite concentrate to the ore's mineralogy rather than to plant performance. Hematite exsolution lamellae in the hemo-ilmenite lower TiO2 against the 52.8 per cent of stoichiometric ilmenite, an MgO solid solution in the ilmenite lattice at 3 to 4 per cent lowers it further, and with silicate impurities the standard concentrate contains 44 to 45 per cent TiO2. The same source states that the hematite lamellae make the ilmenite dissolve more easily in acids than homogeneous ilmenite, and therefore highly suitable to sulphate-process pigment production — so the feature that lowers the grade is the feature that suits the route.

  • assertion basis: SOURCE_REPORTED
  • definition basis: A processing implication stated BY the source, not inferred by Lithoen from a mineral name. The survey names the mechanism, the magnitude and the compensating effect itself.
  • locality: The Tellnes deposit, Rogaland Anorthosite Province, southwestern Norway.
  • assumption: This says nothing about recovery, throughput, cost or the economics of the operation, none of which the source gives. It is not a statement that a lower-TiO2 concentrate is a worse feed: for the sulphate route the source says the opposite.

Evidence support: Supported by the cited evidence one source

Evidence: (ed.) 2012 Primary authority

Establisheda noritic ore body of 53 per cent plagioclase, 29 per cent hemo-ilmenite and 10 per cent orthopyroxene by volume

Reported for this deposit

The Geological Survey of Finland describes the Tellnes Ti-rich noritic ore body as almost 3 km long, more than 400 m wide and plunging eastwards at depth, with an average modal composition of 53 volume per cent plagioclase, 29 volume per cent hemo-ilmenite and 10 volume per cent orthopyroxene, together with some biotite and accessory olivine, magnetite, calcium-rich pyroxene, apatite and sulphides.

  • assertion basis: SOURCE_REPORTED
  • definition basis: Average modal composition as reported in the volume, citing Gierth and Krause 1973, Krause and others 1985 and Duchesne 1999.
  • locality: The Tellnes deposit, Rogaland Anorthosite Province, southwestern Norway.
  • assumption: A modal average is not a grade and is not a resource statement.

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 Tellnes. The Fennoscandian metallogeny volume gives it a magmatic setting — a Ti-rich noritic body in the Rogaland Anorthosite Province, with a parental magma of Fe-Ti-P-rich ferrodiorite composition and a zircon age of 920 plus or minus 3 million years — but this corpus holds no mineral-system entity for magmatic Fe-Ti oxide systems, and inventing one to hang this deposit on would create a class from a single case.

  • assertion basis: SOURCE_REPORTED
  • definition basis: The absence of a matching mineral-system entity in this corpus, recorded rather than left silent.
  • locality: Rogaland Anorthosite Province, southwestern Norway.
  • assumption: This is a statement about Lithoen's coverage, not about the state of knowledge: magmatic Fe-Ti oxide systems are well described in the literature.

Evidence support: Supported by the cited evidence one source

Evidence: (ed.) 2012 Primary authority

In the knowledge graph

Record last updated 2026-09-09. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.