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THE ORE DATABASE
Occurence 1824 - 028 Straum
(Object Id: 2893)
(Last updated: 28.04.2020)

Location
County: Nordland Municipality: Vefsn (1824)
Map 1:50000: Mosjøen (1826-1) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 418702 m. North: 7317367 m.
Longitude: 13.2109060 Latitude: 65.9667870
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Fe 15 % 22.10.1992

Operations
From - To Activity Comments
1972 - 1972 Geophysics
1978 - 1978 Geology Company/Institution :Rana Gruber

Mineralization
Era: Proterozoic Period: Neoproterozoic
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: 200 / 70 Direction: 200
Plunge: 20
Stratigraphic classification of host rock
Era: Period:
Province: Caledonides
Geotec.unit: Helgeland Nappe Complex
Tectonic complex: Elsfjord unit
Igneous complex:
Group: Elsfjordgruppen Formation: Jernmalmformasjon

Mineralogy
Relationship Mineral Amount
Gangue mineral Amphibole Major mineral (>10%)
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Carbonate Subordinate mineral (1-10%)
Gangue mineral Apatite Accessory mineral (<1%)
Ore mineral Magnetite Major mineral (>10%)

Lithology:
Relationship Rock Origin
Unknown Karb.-aktinolittb.a. Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Unknown Primary layering Strike/Dip :200 / 70 Syn-mineralisation ;...Effect :None

Information(s) in free text format
Free text
The iron formation is exposed along the riverbeds of Drevja, ca. 2 km SSW of Almåsen. An approximately 8 m thick sequence of IF is found on the northern side of the riverbank and consists of finely banded, cm-scale magnetite ore in a calcareous amphibolitic matrix (Sample JS_FE1701-02). The strike and dip of the banding is 235°/65°. Calcareous amphibole-mica schist in the west is intensely small-scale folded. Similar schist in the east is locally enriched in disseminated magnetite (Sample JS_FE1703).

Fieldsamples
Sample No. Sample type Miscellanrous
JS_FE1701 Bedrock
Sampler: J.S. Sandstad
Comment: Magnetite, finely banded in calc. amphibole-mica schist
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
JS_FE1702 Bedrock
Sampler: J.S. Sandstad
Comment: Magnetite, finely banded in calc. amphibole-mica schist
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt 1
(Object Id: 36454 28,00,01)

Location
County: Nordland Municipality: Vefsn (1824)
Map 1:50000: Mosjøen (1826-1) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 418753 m. North: 7317350 m.
Longitude: 13.2120300 Latitude: 65.9666440
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe


Fieldsamples
Sample No. Sample type Miscellanrous
JS_FE1703 Bedrock
Sampler: J.S. Sandstad
Comment: Magnetite dissemination in calc. amphibole-mica schist
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 1824 - 028 Straum

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)
Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Au# As*
JS_FE1701 Bedrock 8 19 1 8 11 1.0 1
JS_FE1702 Bedrock 7 23 1 10 12 .9 1
JS_FE1703 Bedrock 31 73 4 11 26 2.9 1
------------------
Sample No. Ba* Mo* Sn* Se* Ga* V* Th* U* W*
JS_FE1701 152 0.60 -1 1.20 5.80 79 3.70 0.60 -1
JS_FE1702 249 0.90 -1 -0.50 4.50 57 2.80 0.50 1
JS_FE1703 725 0.60 2 0.90 16.20 122 10.10 2.00 1
------------------
Sample No. Rb* Sr* Y* Zr* Nb* Ta* Cs* La* Ce*
JS_FE1701 22.2 239.8 20.7 78 6.50 0.40 1.00 18.60 38.80
JS_FE1702 12.4 238.1 14.9 73 5.80 0.40 0.60 17.20 37.10
JS_FE1703 119.7 856.3 23.6 224 20.00 1.30 5.50 32.40 67.60
------------------
Sample No. Pr* Nd* Sm* Eu* Gd* Tb* Dy* Ho* Er*
JS_FE1701 4.58 18.70 3.75 0.86 3.52 0.56 3.30 0.70 2.21
JS_FE1702 4.22 16.70 3.28 0.73 3.24 0.49 2.87 0.61 1.86
JS_FE1703 7.52 28.30 5.34 1.16 4.97 0.80 4.94 0.97 2.91
------------------
Sample No. Tm* Yb* Lu* Be* Hf*
JS_FE1701 0.32 2.01 0.31 1 2.00
JS_FE1702 0.25 1.74 0.27 -1 1.80
JS_FE1703 0.42 2.81 0.42 -1 6.10

Oxide analyses

( All values are in % )
Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO
JS_FE1701 Bedrock 48.70 5.08 0.47 33.70 0.15 3.68 5.18
JS_FE1702 Bedrock 51.50 4.15 0.38 35.00 0.44 3.06 3.30
JS_FE1703 Bedrock 55.20 14.10 1.04 11.90 0.10 4.07 4.32
------------------
Sample No. Na2O K2O P2O5 Loss Sum
JS_FE1701 0.44 0.59 0.29 1.09 99.00
JS_FE1702 0.65 0.34 0.22 0.22 99.00
JS_FE1703 3.27 2.70 0.21 1.93 99.00


The fact sheet was created on 21.10.2021

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