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THE ORE DATABASE | |||||
Occurence 1824 - 002 Gåstjønna | |||||
(Object Id: 2151) (Last updated: 28.04.2020) |
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Location |
County: | Nordland | Municipality: | Vefsn (1824) |
Map 1:50000: | Elsfjord (1927-3) | Map 1:250000: | Mo i Rana |
Coordinate system: | EU89-UTM Zone 33 |
East: | 436544 m. | North: | 7332402 m. |
Longitude: | 13.5959830 | Latitude: | 66.1057030 |
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: | Little Importance (reg. 18.02.2015) |
Resources and production |
Activity: | Exploration | Reserves: | 1125 thousand tons | |
Operating method: | Historical production: |
Products |
Element/product | Crude ore grade or quality | Reg. date | |
Fe-mag. | 10 % | 04.01.1993 | |
Fe-total | 19 % | 04.01.1993 |
Operations |
From - To | Activity | Comments | |
1975 - 1975 | 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: | 355 / 80 | Direction: | 225 | |
Plunge: | 40 |
Stratigraphic classification of host rock |
Era: | Proterozoic | Period: | Neoproterozoic |
Province: | Caledonides | |
Geotec.unit: | Helgeland Nappe Complex | |
Tectonic complex: | Øverste allokton | |
Igneous complex: |
Group: | Elsfjordgruppen | Formation: | Jernformasjonen |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Epidote | Major mineral (>10%) | |
Gangue mineral | Amphibole | Major mineral (>10%) | |
Gangue mineral | Quartz | Major mineral (>10%) | |
Gangue mineral | Chlorite | Subordinate mineral (1-10%) | |
Gangue mineral | Carbonate | Subordinate mineral (1-10%) | |
Gangue mineral | Biotite | Subordinate mineral (1-10%) | |
Gangue mineral | Apatite | Accessory mineral (<1%) | |
Ore mineral | Magnetite | Major mineral (>10%) | |
Ore mineral | Hematite | Subordinate mineral (1-10%) |
Lithology: |
Relationship | Rock | Origin | |
Unknown | Staurolitt-granatgl.sk. | Sedimentary Original rock :Argillaceous sediment |
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Metamorphic facies :Amphibolite | |||
Unknown | Amfibolitt | Extrusive Original rock :Basalt |
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Metamorphic facies :Amphibolite |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Unknown | Primary layering | Strike/Dip :45 / 80 | Syn-mineralisation ;...Effect :None |
Information(s) in free text format |
Free text |
The Gåstjønna IF is supposed to represent the same horizon as at Seljeli. It is partly enclosed by the Nilsfjellet quartz diorite. The IF is exposed along a steep minor waterfall east of Gåstjønna. The IF is steep dipping and about 15 m thick and comprises both massive and disseminated magnetite in amphibole and epidote rich matrix that commonly is finely banded. Four samples were collected across the sequence (Samples JS_FE1732-35). Hematite-rich horizons as in Seljeli were not observed. On top of the waterfall occurs medium-grained garnet-mica schist. Both the IF and schist is crosscut by several felsic dykes. |
Bibliography: |
From NGU's Reference Archive: |
Bøckman, K.L. , 1947 |
Seljeli jernmalmforekomster i Elsfjord. |
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1986;5 pages |
Abstract: | |
Lokalitetsnummer forts.: 40456, 40458 - 40460 Rapporten er en brevkopi og omhandler Seljeli jernmalmforekomster. Det blir referert til magnetometerundersøkelser og gitt en detaljert beskrivelse av nødvendige undersøkelsesarbeider av forekomsten. Det er også utført malmberegninger og driftsoverslag. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | |||||
JS_FE1732 | Bedrock |
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JS_FE1733 | Bedrock |
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JS_FE1734 | Bedrock |
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JS_FE1735 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
from |
Deposit Area 1824 - 002 Gåstjønna |
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_FE1732 | Bedrock | 4 | 18 | 1 | 10 | 11 | 2.0 | -1 |
JS_FE1733 | Bedrock | 3 | 22 | 2 | 11 | 14 | 2.4 | 1 |
JS_FE1734 | Bedrock | 2 | 17 | 1 | 13 | 15 | 1.6 | 1 |
JS_FE1735 | Bedrock | 3 | 19 | 2 | 13 | 15 | 2.3 | -1 |
------------------ |
Sample No. | Ba* | Mo* | Sn* | Se* | Ga* | V* | Th* | U* | W* |
JS_FE1732 | 199 | 0.30 | 1 | -0.50 | 8.60 | 110 | 5.20 | 0.80 | -1 |
JS_FE1733 | 60 | 0.50 | 1 | -0.50 | 8.40 | 95 | 5.10 | 0.60 | -1 |
JS_FE1734 | 26 | 0.50 | -1 | -0.50 | 4.30 | 75 | 2.90 | 0.70 | -1 |
JS_FE1735 | 158 | 0.40 | 2 | -0.50 | 9.80 | 113 | 5.90 | 1.10 | 1 |
------------------ |
Sample No. | Rb* | Sr* | Y* | Zr* | Nb* | Ta* | Cs* | La* | Ce* |
JS_FE1732 | 22.9 | 249.5 | 26.6 | 107 | 8.20 | 0.40 | 0.10 | 21.20 | 50.00 |
JS_FE1733 | 34.1 | 189.2 | 22.8 | 98 | 9.50 | 0.60 | 0.20 | 24.10 | 51.20 |
JS_FE1734 | 1.9 | 221.0 | 20.1 | 57 | 6.80 | 0.30 | -0.10 | 13.90 | 29.50 |
JS_FE1735 | 22.1 | 323.5 | 24.8 | 120 | 12.20 | 0.70 | 0.10 | 30.50 | 64.20 |
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Sample No. | Pr* | Nd* | Sm* | Eu* | Gd* | Tb* | Dy* | Ho* | Er* |
JS_FE1732 | 5.65 | 21.90 | 4.67 | 1.15 | 4.61 | 0.74 | 4.36 | 0.95 | 2.80 |
JS_FE1733 | 5.80 | 22.50 | 4.41 | 1.08 | 4.16 | 0.66 | 4.03 | 0.82 | 2.54 |
JS_FE1734 | 3.24 | 13.10 | 2.46 | 0.66 | 2.70 | 0.44 | 2.95 | 0.66 | 2.12 |
JS_FE1735 | 7.08 | 26.30 | 5.21 | 1.24 | 5.09 | 0.74 | 4.52 | 0.91 | 2.66 |
------------------ |
Sample No. | Tm* | Yb* | Lu* | Be* | Hf* | ||||
JS_FE1732 | 0.38 | 2.56 | 0.38 | -1 | 2.90 | ||||
JS_FE1733 | 0.35 | 2.23 | 0.37 | -1 | 2.40 | ||||
JS_FE1734 | 0.31 | 2.05 | 0.32 | -1 | 1.30 | ||||
JS_FE1735 | 0.37 | 2.46 | 0.37 | -1 | 3.10 |
Oxide analyses |
( All values are in % ) |
Sample No. | Sample Type | SiO2 | Al2O3 | TiO2 | Fe2O3 | MnO | MgO | CaO |
JS_FE1732 | Bedrock | 45.60 | 7.85 | 0.62 | 29.90 | 0.11 | 4.42 | 8.22 |
JS_FE1733 | Bedrock | 45.80 | 6.73 | 0.55 | 29.10 | 0.18 | 5.05 | 10.40 |
JS_FE1734 | Bedrock | 33.30 | 3.50 | 0.32 | 42.50 | 0.65 | 5.67 | 13.10 |
JS_FE1735 | Bedrock | 44.60 | 8.31 | 0.72 | 23.00 | 0.20 | 6.47 | 13.90 |
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Sample No. | Na2O | K2O | P2O5 | Loss | Sum | ||||
JS_FE1732 | 1.03 | 1.21 | 0.51 | -0.44 | 99.00 | ||||
JS_FE1733 | 0.65 | 1.16 | 0.35 | -0.41 | 100.00 | ||||
JS_FE1734 | 0.39 | 0.13 | 0.41 | -0.76 | 99.00 | ||||
JS_FE1735 | 0.91 | 1.10 | 0.37 | 0.03 | 100.00 |
The fact sheet was created on 29.03.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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