(Last updated: 05.02.2016)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit 1833 - 049 Ørtvann | |||||
| (Object Id: 2730) (Last updated: 05.02.2016) |
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| Belongs to the Province: Dunderlandsdalen jern |
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| Location |
| County: | Nordland | Municipality: | Rana (1833) |
| Map 1:50000: | Storforshei (2027-4) | Map 1:250000: | Mo i Rana |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 479232 m. | North: | 7365597 m. |
| Longitude: | 14.5349720 | Latitude: | 66.4091850 |
| Show on map |
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| Resource |
| Resource Type: | Ferrous metals(Fe, Mn, Ti) | Resource Subtype: | Iron | |
| Element(s): | Fe |
| Importance |
| Raw material meaning: | Regional Importance (reg. 09.02.2017) |
| Resources and production |
| Activity: | Mining | Reserves: | 26000 thousand tons | |
| Operating method: | Open pit mining | Historical production: | 17600 thousand tons |
Products |
| Element/product | Crude ore grade or quality | Reg. date | |
| Fe | 33 % | 02.11.1992 |
Operations |
| From - To | Activity | Comments | |
| 1904 - 1908 | Regular production | Company/Institution :Dunderland Iron Ore Company | |
| 1928 - 1931 | Regular production | Company/Institution :Dunderland Iron Ore Company | |
| 1937 - 1939 | Regular production | Company/Institution :Dunderland Iron Ore Company | |
| 1942 - 1945 | Geology | Company/Institution :Rana Gruber | |
| 1945 | Core drilling | Company/Institution :Diamantboring før 1945 | |
| 1958 | Geophysics | Company/Institution :Geofysisk Malmleting/Rana Gruber | |
| 1958 - 1964 | Test mining | Company/Institution :Forsøksverket,Rana Gruber | |
| 1958 - 1969 | Core drilling | Company/Institution :Rana Gruber | |
| 1960 | Geophysics | Company/Institution :Geofysisk Malmleting/Rana Gruber | |
| 1964 - 1983 | Regular production | Company/Institution :Rana Gruber | |
| 1966 | Geophysics | Company/Institution :Geofysisk Malmleting/Rana Gruber |
Mineralization |
| Era: | Proterozoic | Period: | Neoproterozoic | |
| Genesis: | Sedex | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
| Main grain size: | Medium grained (1-3 mm) | Main alteration: |
| Strike/Dip: | 110 / 60 | Direction: | 270 | |
| Plunge: | 20 |
| Stratigraphic classification of host rock |
| Era: | Proterozoic | Period: | Neoproterozoic |
| Province: | Caledonides | |
| Geotec.unit: | Rødingsfjell Nappe Complex | |
| Tectonic complex: | Midtre allokton | |
| Igneous complex: |
| Group: | Ørtfjell | Formation: | Dunderland |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Chlorite | Subordinate mineral (1-10%) | |
| Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
| Gangue mineral | Calcite | Subordinate mineral (1-10%) | |
| Gangue mineral | Dolomite | Subordinate mineral (1-10%) | |
| Gangue mineral | Apatite | Subordinate mineral (1-10%) | |
| Gangue mineral | Muscovite | Subordinate mineral (1-10%) | |
| Gangue mineral | Potassic feldspar | Subordinate mineral (1-10%) | |
| Gangue mineral | Amphibole | Subordinate mineral (1-10%) | |
| Gangue mineral | Biotite | Subordinate mineral (1-10%) | |
| Gangue mineral | Garnet | Accessory mineral (<1%) | |
| Ore mineral | Magnetite | Major mineral (>10%) | |
| Ore mineral | Hematite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Unknown | Carbonate mica schist | Sedimentary Original rock :Argillaceous sediment |
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| Metamorphic facies :Amphibolite | |||
| Unknown | Mica schist | Sedimentary Original rock :Greywacke |
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| Metamorphic facies :Amphibolite |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Unknown | Fold axis | Strike/Dip :110 / 20 | Syn-mineralisation ;...Effect :None | |
| Unknown | Primary layering | Strike/Dip :110 / 60 | Syn-mineralisation ;...Effect :None | |
| Unknown | Foliation | Strike/Dip :110 / 60 | Syn-mineralisation ;...Effect :None |
Information(s) in free text format |
| Free text |
| Ørtvann mt.-hem.-malm 100 m.o.h. ----------------------------------------------- har en total feltlengde 1.5 km og danner en synform med aksestupning 20 grader vestover.Det er i alt tatt ut 17.6 mill.tonn dagbruddsmalm i et 1000 m langt brudd ned til nivå 17.5 (helt i øst ned til nivå 5). Av gråberg er tatt ut 33.9 mill.tonn som med sp.v. 1.7 i steintipp gir 19.9 mill.m3 steintipp. Angående gjenværende malmtonnasje i Ørtvann: Beregning fra nåværende malm i dagen i øst og 840 m strøklengde vestover ned til nivå -100 gir 26 mill. tonn. 19 mill.tonn av de 45 mill.tonn gjenværende malm i tidligere tabeller ned til nivå -200 etter 1.8 km strøklengde er usikre da det omtrent ikke er borhull mellom nivå -100 og -200. For å bore opp malmen videre ned vestover kreves 500 m lange hull fra dagen. Bedre ville vært en undersøkelses-stoll og boring av kortere hull fra denne. I dag er dagbruddet vannfyllt til nivå ca. 60, og vann vil være et stort problem ved eventuell framtidig drift. Det er diamantboret 60 hull,9 352 m før 1945 og 14 223 m i tiden 1958-1969. Råmalm-gehalten er: 33.0 % Fe total, 18,0 % Fe-magn., 0.20 % P, 0.35 % S, 0.48 % TiO2, 0.29 % MnO, 0.49 % Na2O, 1.10 % K2O. Forholdet hem./magn.: 45.5 : 54.5 = 0.83 og mineralogien er: 21.4 % Hematitt 24.9 % Magnetitt 30.9 % Kvarts 4.0 % Epidot 5.0 % Kalksp/Dolo. 3.0 % Kloritt 6.0 % Amfibol 1.0 % Oligoklas 1.0 % Biotitt 1.0 % Muskovitt 1.1 % Apatitt 0.1 % Granat 0.6 % Svovelkis Eldre litteratur: Bugge, Jens A.W. 1948 : Rana Gruber,NGU nr.171 side 14-34 Ørtvannsfeltet. |
Bibliography: |
| From NGU's Reference Archive: |
| Bugge, Jens A.W. , 1948 |
| Rana gruber. Geologisk beskrivelse av jernmalmfeltene i Dunderlandsdalen. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.171;1-149 + f pages |
| Abstract: | |
| (forkortet) The mining company A/S Rana Gruber has made extensive exploration of the iron ore deposits in Dunderlandsdalren under the leadership of mining engineer Worm Lund and. The field work comprises the following sections: Geodetic works and constructions of topographic maps. - Geology. - Exploration of the ore deposits by diamond drilling. - Exploration of the ground above the solid rocks (for foundation). The present paper gives and outline of the geology. Map 1 illustrates the main geological features of Rana. The sedimenatary rocks belong to the lower part of the sediments of the Caledonian mountain range. They are older than the fossil-bearing Sulitjelma-schists described by Th. Vogt, and are probably of lower Ordovician or Upper Cambrianage age. The most characterisitctic features in the western part of the area illustrate d in map 2 are the graeat folds in with axes striking E-W and dipping 10-20 W There are two anticlinededs seperated by syncline. The northern Bomfjell- anticline is superseded toward south by the Svanheim-syncline and this again by the Nevernes-Lasken anticline. Toward east the fold axes turn from E-W to NNE -SSW, while the pitch varies between NE and SW. The compression of the rocks is higher in the eastern parts than in the western ones. |
| Aalstad, I. , 1964 |
| Tyngdemåling Ørtvannfeltet/Nord-Rana |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.524;5 pages |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| NO0610.01 | Bedrock |
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| NO0610.02 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 1833 - 049 Ørtvann |
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# |
| NO0610.01 | Bedrock | 8 | 17 | 5 | -1 | 14 | -.3 | 7.0 |
| NO0610.02 | Bedrock | 10 | 14 | 3 | -1 | 9 | -.3 | 2.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | Rh# | As* | Cd* | Ba* | Mo* | Sb* | Bi* |
| NO0610.01 | -3.0 | -3.0 | -5.0 | -2 | 2.3 | 93 | 3.00 | -2 | -2 |
| NO0610.02 | -3.0 | -3.0 | -5.0 | -2 | 1.4 | 19 | 2.00 | -2 | 4 |
| ------------------ |
| Sample No. | S% | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* |
| NO0610.01 | -.01 | 33 | 13 | 507 | 30.35 | 2.00 | -5.00 | -2 | 61.0 |
| NO0610.02 | -.01 | 17 | 10 | 663 | 19.12 | -2.00 | -5.00 | -2 | 27.0 |
| ------------------ |
| Sample No. | La* | B* | |||||||
| NO0610.01 | 7.00 | 6 | |||||||
| NO0610.02 | 1.00 | 5 |
| The fact sheet was created on 04.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |