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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 2030 - 006 | |||||
| (Last updated 13.mar.2024) | |||||
Name of Deposit Area : Bjørnevatn |
| (Object Id : 2030,006,00,00) |
| Drill Cores from the Deposit Area: See Borehole Area Bjørnevatn |
| Location |
| County : | Finnmark (20) | Municipality : | Sør-Varanger (2030) |
| Map 1:50000: | Kirkenes (2434-2) | Map 1:250000: | Kirkenes |
| Marking point: | Longitude: | 30.0253050 | Latitude: | 69.6519520 |
| EU89-UTM Zone 36 | (Coordinates IS confirmed) |
| X-coord: | 384599 m. | Y-coord: | 7729870 m. |
|
|
| Commodity |
| Main Type: | Ferrous metals(Fe, Mn, Ti) | Sub Type: | Iron | |
| Element(s): | Fe |
| Production |
| Activity: | Mining | Reserves: | 277400 thousand tons | |
| Prod. method: | Open pit mining | Production: | 150000 thousand tons | |
| Prod. status: | Active | Volume of dump: | 850000000 m3 | |
| Resource estimat. standard: | JORC |
| Importance |
| Public: | International Importance (reg. 27.06.2017) |
| Economical: | Very significant , (Confirmed 12.feb.2005 by Are Korneliussen) |
Products |
| Element/product | Crude ore grade or quality | |
| FE_MAG | 32 % |
Operations |
| From - To | Activity | Comments | |
| 1908 - 1944 | Regular production | Company/Institution :A/S Sydvaranger | |
| 1952 - 1996 | Regular production | Company/Institution :A/S Sydvaranger | |
| 1996 - 1996 | Sampling | Company/Institution :NGU-malmreg. |
Mineralization |
| Era: | Archean | Period: | ||
| Dating: | Method: | |||
| Genesis: | Sedex | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Semi-massive (20-50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: |
| Strike/Dip: | 340 / 70 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Archean | Period: |
| Province: | ||
| Geotec.unit: | ||
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Bjørnevann Group | Formation: | Fisketind Formation |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Amphibole | Subordinate mineral (1-10%) | |
| Gangue mineral | Epidote | Accessory mineral (<1%) | |
| Ore mineral | Magnetite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Banded iron formation | Sedimentary | |
| Metamorphic facies :Amphibolite | |||
| Wall rock | Hornblende gneiss | Extrusive Original rock :Basalt |
|
| Metamorphic facies :Amphibolite | |||
| Wall rock | Granitic gneiss | Extrusive Original rock :Rhyolite |
|
| Metamorphic facies :Amphibolite | |||
| Wall rock | Quartsitic mica gneiss | Sedimentary Original rock :Muddy sandstone |
|
| Metamorphic facies :Amphibolite |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :340 / 70 | Post-mineralisation ;...Effect :None | |
| Host rock | Primary layering | Strike/Dip :340 / 70 | Syn-mineralisation ;...Effect :Controls |
Information(s) in free text format |
| Free text |
| The Bjørnevatn Banded Iron Formation represents the largest accumulation of BIF ores in the Sør-Varanger province. The ore field was first discovered by the commissioner of mines Tellef Dahll in 1865 (Dahll 1891), but exploration of the ore field started nearly forty years later in 1906. Full scale mining commenced in 1910 by A/S Sydvaranger and continued until 1997. During this period open pit and subordinate under-ground mining gave a total production of over 200 Mt of crude ores with about 30 wt % Fe (magnetic). In 2009 Sydvaranger Gruve AS reopened the deposit and are presently mining two of the ore bodies (Hyttmalmen, Kjellmannåsen) with proven ore reserves of 20 Mt containing 34 wt % Fe (total). However, the company has defined 10 different ore bodies for future mining with total reserves (proven+indicated+ inferred) of 449 Mt with 31 wt % Fe (total). The ore bodies are part of the Bjørnevass Group which comprises formations composed dominantly of siliceous gneisses and quartzites, meta-conglomerates, mica schists and mafic to intermediate metavolcanites with BIF horizons. The latter lithologies constitute the Fisketind formation which contains two levels of BIFs being interlayered with and separated by sequences of magnetite-rich amphibolites, locally with pillow structures, as well as hornblende gneisses and quartz-biotite gneisses. The ore bodies of the upper BIF level have been the main target for open pit mining both in the past and presently. The shape of the ore bodies are the ultimate result of three phases of isoclinal to tight folding. In the northern part of the mining field the distribution of ores is governed by a moderate SE-plunging synform overturned towards the west. They may reach a thickness of nearly 200 m and a strike-length in the range 1-5 km. The upper BIF usually contains 30-35 % Fe (magnetic) (> 50 % magnetite) and the lower 10-30 % Fe (magnetic). |
| Photo(s) from the Deposit area: |
|
Bibliography: |
| From NGU's Reference Archive: |
| Vogt, J.H.L. , 1910 |
| Norges jernmalmforekomster |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.51;225 pages |
| Abstract: | |
| Magmatische Ausscheidungen (I-VI). |
| Bugge, Jens A.W. , 1960 |
| Precambrian of northern Norway. Precambrian of eastern Finnmark. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.208;78-92 pages |
| References not to be found in NGU's Reference Archive.: |
| Johansen, J.K. 1955: Aktieselskabet Sydvaranger. Teknisk Ukeblad nr. 14-19. (BA 3499). |
| A/S Sydvaranger 1985: Gruveplan 1985. Int rapp. |
| Iversen, E. 1991: Geologisk beskrivelse til kartblad 2434 II Kirkenes og deler av kartblad 2024 III Høybuktmoen. Rapp. nr. 2072, Prospektering A/S. |
| Bugge, J.A.W. 1980: The Sydvaranger type of quartz banded iron ore, with a synopsis of Precambrian geology and iron deposits of Finnmark. Geol. Surv. Finl. 307, 15-24. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| FI0007.01 | Bedrock |
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| FI0007.02 | Bedrock |
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| FI0007.03 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Name of Locality : Vestmalmen |
| (Object Id : 2030,006,01,00) |
| Location |
| County : | Finnmark (20) | Municipality : | Sør-Varanger (2030) |
| Map 1:50000: | Kirkenes (2434-2) | Map 1:250000: | Kirkenes |
| Marking point: | Longitude: | 30.0108960 | Latitude: | 69.6480260 |
| EU89-UTM Zone 36 | (Coordinates IS confirmed) |
| X-coord: | 384019 m. | Y-coord: | 7729459 m. |
|
|
| Commodity |
| Main Type: | Ferrous metals(Fe, Mn, Ti) | Sub Type: | Iron | |
| Element(s): | Fe |
| Production |
| Activity: | Mining | Reserves: | ||
| Prod. method: | Open pit mining | Production: | ||
| Prod. status: | Disused, closed | Volume of dump: |
Name of Locality : Nordmalmen |
| (Object Id : 2030,006,02,00) |
| Location |
| County : | Finnmark (20) | Municipality : | Sør-Varanger (2030) |
| Map 1:50000: | Kirkenes (2434-2) | Map 1:250000: | Kirkenes |
| Marking point: | Longitude: | 30.0120210 | Latitude: | 69.6583690 |
| EU89-UTM Zone 36 | (Coordinates IS confirmed) |
| X-coord: | 384119 m. | Y-coord: | 7730610 m. |
|
|
| Commodity |
| Main Type: | Ferrous metals(Fe, Mn, Ti) | Sub Type: | Iron | |
| Element(s): | Fe |
| Production |
| Activity: | Mining | Reserves: | ||
| Prod. method: | Open pit mining | Production: | ||
| Prod. status: | Disused, closed | Volume of dump: |
Analyse Results |
| from |
| Deposit Area 2030 - 006 Bjørnevatn |
Element analyses |
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.) |
| Sample No. | Sample Type | Cu* | Zn* | Pb* | Co* | Ni* | Ag* | Au# |
| FI0007.01 | Bedrock | 6 | 4 | 3 | 1 | 7 | -.3 | 1.0 |
| FI0007.02 | Bedrock | 9 | 4 | -3 | -1 | 9 | -.3 | 1.0 |
| FI0007.03 | Bedrock | 8 | 1 | -3 | -1 | 3 | -.3 | 2.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | Rh# | As* | Cd* | Ba* | Mo* | Sb* | Bi* |
| FI0007.01 | -1.0 | -1.0 | -1.0 | 3 | 3.3 | 24 | -1.00 | -2 | 4 |
| FI0007.02 | 1.0 | 2.0 | -1.0 | 4 | 4.1 | 13 | -1.00 | -2 | -2 |
| FI0007.03 | -1.0 | 1.0 | -1.0 | -2 | .6 | -1 | -1.00 | -2 | 4 |
| ------------------ |
| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| FI0007.01 | 1 | -1 | 626 | 27.21 | 6.00 | 6.00 | -2 | 3.0 | 1.00 |
| FI0007.02 | 1 | -1 | 608 | 26.49 | 6.00 | 6.00 | -2 | 4.0 | 1.00 |
| FI0007.03 | 2 | 1 | 468 | 24.65 | 5.00 | -5.00 | -2 | 2.0 | -1.00 |
| ------------------ |
| Sample No. | B* | ||||||||
| FI0007.01 | 5 | ||||||||
| FI0007.02 | -3 | ||||||||
| FI0007.03 | -3 |
| The fact sheet was created on 18.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |