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THE ORE DATABASE
Deposit Area 1833 - 049
(Last updated 05.feb.2016)

Name of Deposit Area : Ørtvann
(Object Id : 1833,049,00,00)
The deposit area belongs to the Province : Dunderlandsdalen jern
Location
County : Nordland (18) Municipality : Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Marking point: Longitude: 14.5349720 Latitude: 66.4091850
EU89-UTM Zone 33 (Coordinates IS confirmed)
X-coord: 479232 m. Y-coord: 7365597 m.
Commodity
Main Type: Ferrous metals(Fe, Mn, Ti) Sub Type: Iron
Element(s): Fe
Production
Activity: Mining Reserves: 26000 thousand tons
Prod. method: Open pit mining Production: 17600 thousand tons
Prod. status: Disused, closed Volume of dump: 20000000 m3

Importance
Public: Regional Importance (reg. 09.02.2017)
Economical: Significant , (Confirmed 25.feb.2005 by Agnes Raaness)

Products
Element/product Crude ore grade or quality
FE 33 %

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
Dating: Method:
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
Metamorphic facies :Amphibolite
Unknown Mica schist Sedimentary
Original rock :Greywacke
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
Sampler :Søvegjarto, U./...Stored :Løkken
Comment :Fe-malm.
No. of registrated element analyses = 1
NO0610.02 Bedrock
Sampler :Søvegjarto, U./...Stored :Løkken
Comment :Fe-malm.
No. of registrated element analyses = 1
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 22.11.2024
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