(Last updated: 16.02.2005)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Occurence 5006 - 004 Grunntjørna IV | |||||
| (Object Id: 157) (Last updated: 16.02.2005) |
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| Location |
| County: | Trøndelag | Municipality: | Steinkjer (5006) |
| Map 1:50000: | Holden (1623-2) | Map 1:250000: | Namsos |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 595669 m. | North: | 7102462 m. |
| Longitude: | 10.9586790 | Latitude: | 64.0357000 |
| 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: | Pitting | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1908 - 1910 | Geophysics | ||
| 1910 - 1910 | Core drilling | ||
| 1952 - 1952 | Geophysics | ||
| 1953 - 1953 | Geophysics |
Mineralization |
| Era: | Paleozoic | Period: | Ordovician | |
| Genesis: | Volcex | Form: | Ruler | |
| Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: | Chloritisation |
| Strike/Dip: | 245 / 45 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | Trondheim Nappe Complex | |
| Tectonic complex: | Øvre allokton | |
| Igneous complex: |
| Group: | Fosdalsgruppen | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Amphibole | Major mineral (>10%) | |
| Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
| Gangue mineral | Chlorite | Subordinate mineral (1-10%) | |
| Gangue mineral | Plagioclase | Subordinate mineral (1-10%) | |
| Ore mineral | Magnetite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Subordinate mineral (1-10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Tuffitic schist | Extrusive Original rock :Tuff |
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| Metamorphic facies :Greenschist | |||
| Wall rock | Greenstone | Extrusive Original rock :Basalt |
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| Metamorphic facies :Greenschist |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :245 / 45 | Post-mineralisation ;...Effect :None |
Information(s) in free text format |
| Free text |
| Mineraliseringene ved Grunntjørna ble funnet i 1908 og magnetometermåling, røsking og diamantboring foretatt 1908-1910. Waldemargruben er den østligste i feltet og består av noen små røskinger. Hovedforekomsten er en 3 m lang røskegrøft i bekkeskråning (ingen tipp). Den er gjenrast og berggrunnen er ikke blottet, men den har sannsynligvis avblottet mineraliseringens heng. Malmsonen er blottet i bekken mellom hovedforekomsten og skjerp 1. Her er jernformasjonen 1.5 m mektig. Den massive magnetitt-mineraliseringen (prøve 04) har disseminasjonsbånd av svovelkis og endel iblanding av tuffittiske bånd (03 er gjennomsnittsprøve av malmsonen). Hengberg er lys tuffittisk skifer med litt svovelkis-disseminasjon (01). Liggberg er klorittisert grønnstein rik på svovelkis- og magnetitt-disseminasjon (02). |
Bibliography: |
| From NGU's Reference Archive: |
| Singsaas, P.; Brækken, H. , 1954 |
| Magnetisk kartering Grunntjern, Malm. |
| ;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.97;9 pages |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| NT0159.01 | Bedrock |
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| NT0159.02 | Bedrock |
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| NT0159.03 | Bedrock |
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| NT0159.04 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Grunntjørna IV, Skjerp 1 |
| (Object Id: 546 4,01,00) |
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| Location |
| County: | Trøndelag | Municipality: | Steinkjer (5006) |
| Map 1:50000: | Holden (1623-2) | Map 1:250000: | Namsos |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 595649 m. | North: | 7102462 m. |
| Longitude: | 10.9582700 | Latitude: | 64.0357050 |
| Show on map |
|
|
| Resource |
| Resource Type: | Ferrous metals(Fe, Mn, Ti) | Resource Subtype: | Iron | |
| Element(s): | Fe |
| Resources and production |
| Activity: | Pitting | Reserves: | ||
| Operating method: | Historical production: |
Information(s) in free text format |
| Free text |
| 1x1x1 m skjerp, 1 m3 tipp. Pga. overdekning kan ikke malmmektigheten bestemmes, men det er minst 20 cm. |
Analyse Results |
| from |
| Deposit Area 5006 - 004 Grunntjørna IV |
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# |
| NT0159.01 | Bedrock | 6 | 25 | 5 | 12 | 11 | .1 | 2.0 |
| NT0159.02 | Bedrock | 36 | 89 | 3 | 62 | 76 | .1 | 2.0 |
| NT0159.03 | Bedrock | 51 | 17 | 2 | 22 | 19 | .1 | 2.0 |
| NT0159.04 | Bedrock | 26 | 16 | 2 | 26 | 27 | .1 | 4.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
| NT0159.01 | 1.0 | 1.0 | 6 | .2 | 104 | 3.00 | 2 | 2 | .19 |
| NT0159.02 | 3.0 | 5.0 | 2 | .2 | 42 | 1.00 | 2 | 2 | 2.02 |
| NT0159.03 | 2.0 | 1.0 | 2 | .2 | 15 | 1.00 | 2 | 2 | .23 |
| NT0159.04 | 2.0 | 2.0 | 7 | .8 | 15 | 4.00 | 5 | 2 | .31 |
| ------------------ |
| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| NT0159.01 | 29 | 19 | 322 | 2.86 | 6.00 | 5.00 | 1 | 36.0 | 14.00 |
| NT0159.02 | 66 | 41 | 1175 | 15.50 | 5.00 | 5.00 | 1 | 9.0 | 11.00 |
| NT0159.03 | 56 | 16 | 674 | 36.39 | 4.00 | 5.00 | 1 | 26.0 | 6.00 |
| NT0159.04 | 28 | 15 | 657 | 42.01 | 2.00 | 5.00 | 1 | 11.0 | 2.00 |
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| Sample No. | B* | ||||||||
| NT0159.01 | 2 | ||||||||
| NT0159.02 | 10 | ||||||||
| NT0159.03 | 4 | ||||||||
| NT0159.04 | 6 |
| The fact sheet was created on 25.04.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |