Norsk versjon | |||||
THE ORE DATABASE | |||||
Occurence 5006 - 020 Grunntjørna I | |||||
(Object Id: 291) (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: | 595119 m. | North: | 7102552 m. |
Longitude: | 10.9474830 | Latitude: | 64.0366580 |
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: | Open pit and underground mining | 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: | Skarn formation |
Strike/Dip: | 350 / 45 | Direction: | 20 | |
Plunge: | 10 |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: | Ordovician |
Province: | Caledonides | |
Geotec.unit: | Trondheim Nappe Complex | |
Tectonic complex: | ||
Igneous complex: |
Group: | Fosdalsgruppen | Formation: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Amphibole | Major mineral (>10%) | |
Gangue mineral | Pyroxene | Subordinate mineral (1-10%) | |
Gangue mineral | Plagioclase | Subordinate mineral (1-10%) | |
Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
Gangue mineral | Calcite | Subordinate mineral (1-10%) | |
Ore mineral | Magnetite | Major mineral (>10%) | |
Ore mineral | Pyrrhotite | Subordinate mineral (1-10%) | |
Ore mineral | Pyrite | Subordinate mineral (1-10%) | |
Ore mineral | Chalcopyrite | Accessory mineral (<1%) |
Lithology: |
Relationship | Rock | Origin | |
Host rock | Tuffittisk skifer | Extrusive Original rock :Tuff |
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Metamorphic facies :Greenschist |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Host rock | Fold axis | Strike/Dip :20 / 10 | Post-mineralisation ;...Effect :Controls | |
Host rock | Foliation | Strike/Dip :350 / 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 ble foretatt 1908-1910. Ørngruben ligger NØ for Grunntjørna og er drevet på sansynligvis samme foldete jernformasjon som i Waldemargruben i Ø og Hagengruben og Hans- Hermangruben i V. ØRNGRUBEN består av flere skjæringer og stoller. Hovedforekomst: 15 m lang skjæring som ender i en 10 m lang stoll mot N (250 m3 tipp). Stollen er drevet langs en nedfoldet (åpen fold) jernformasjon på 2 m mektighet, foldeaksen er 20/10. Den finkornete massive magnetittmalmen (prøve 03 og 04) inneholder noe sulfider og øyne og bånd av epidot. Det er en del lavgehaltige partier innen malmsonen. I sideberget er det tuffittisk skifer. |
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 | ||||
NT0339.03 | Bedrock |
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NT0339.04 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Grunntjørna I, Skjerp 1 |
(Object Id: 502 20,01,00) |
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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: | 594669 m. | North: | 7102712 m. |
Longitude: | 10.9383760 | Latitude: | 64.0382160 |
Show on map |
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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 |
Vestligste skjerp er en 20 m lang og 3 m dyp røsk (50 m3 tipp). 1,2 m mektig, finkornet, massiv (semimassive partier inniblant) magnetittmineralisering med mm-mektige sulfidbånd (prøve 01). Noe kalkspat amfibol og epidot i malmen. Grønnlig tuffitt med svovelkis-bånd i ligg (prøve 02). |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
NT0339.01 | Bedrock |
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NT0339.02 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Grunntjørna I, Skjerp 2 |
(Object Id: 503 20,02,00) |
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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: | 594819 m. | North: | 7102732 m. |
Longitude: | 10.9414570 | Latitude: | 64.0383550 |
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 |
20 m lang overgrodd avrøskning av overdekket. Ingen tipp eller blotning. |
Name of Locality: Grunntjørna I, Skjerp 3 |
(Object Id: 504 20,03,00) |
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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: | 594989 m. | North: | 7102672 m. |
Longitude: | 10.9448980 | Latitude: | 64.0377700 |
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 |
To nærliggende røskegrøfter. Ingen mineralisering. |
Name of Locality: Grunntjørna I, Skjerp 4 |
(Object Id: 506 20,04,00) |
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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: | 595119 m. | North: | 7102492 m. |
Longitude: | 10.9474450 | Latitude: | 64.0361200 |
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 |
5 m lang stoll (20 m3 tipp) på et litt lavere nivå i lia enn hovedforekomsten. 50 m mektig steiltstående jernformasjon. |
Name of Locality: Grunntjørna I, Skjerp 5 |
(Object Id: 505 20,05,00) |
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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: | 595269 m. | North: | 7102452 m. |
Longitude: | 10.9504900 | Latitude: | 64.0357200 |
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 |
25 m lang, opptil 5 m dyp røsk som i nordenden ender i en gjenrast stoll. 200 m3 tipp. Minst 2,5 m mektig malmsone med hyppige epidot-pyroksen-amfibol-bånd i malmen. Også mye pyroksenkrystaller (1-2 mm) fordelt i den finkornete jernmalmen (prøve 05 og 06). |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
NT0339.05 | Bedrock |
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NT0339.06 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
from |
Deposit Area 5006 - 020 Grunntjørna I |
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# |
NT0339.01 | Bedrock | 433 | 190 | 3 | 84 | 171 | .3 | 3.0 |
NT0339.02 | Bedrock | 152 | 21 | 9 | 33 | 16 | .1 | 1.0 |
NT0339.03 | Bedrock | 157 | 21 | 2 | 21 | 22 | .2 | 1.0 |
NT0339.04 | Bedrock | 102 | 24 | 2 | 18 | 24 | .2 | 2.0 |
NT0339.05 | Bedrock | 64 | 9 | 2 | 103 | 21 | .1 | 12.0 |
NT0339.06 | Bedrock | 1044 | 10 | 3 | 169 | 31 | .5 | 10.0 |
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Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
NT0339.01 | 2.0 | 3.0 | 3 | .2 | 2 | 1.00 | 2 | 2 | 6.89 |
NT0339.02 | 3.0 | 3.0 | 7 | .3 | 7 | 4.00 | 2 | 2 | .74 |
NT0339.03 | 1.0 | 1.0 | 2 | .2 | 2 | 1.00 | 2 | 2 | .08 |
NT0339.04 | 1.0 | 1.0 | 2 | .2 | 3 | 1.00 | 2 | 2 | .26 |
NT0339.05 | 3.0 | 2.0 | 13 | .2 | 1 | 1.00 | 2 | 2 | 4.24 |
NT0339.06 | 1.0 | 1.0 | 22 | .2 | 10 | 48.00 | 2 | 2 | 5.98 |
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Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
NT0339.01 | 37 | 20 | 659 | 31.68 | 2.00 | 5.00 | 1 | 2.0 | 2.00 |
NT0339.02 | 10 | 32 | 213 | 2.27 | 12.00 | 5.00 | 1 | 23.0 | 13.00 |
NT0339.03 | 69 | 9 | 525 | 33.37 | 1.00 | 5.00 | 1 | 3.0 | 2.00 |
NT0339.04 | 65 | 12 | 668 | 31.10 | 1.00 | 5.00 | 1 | 6.0 | 2.00 |
NT0339.05 | 12 | 11 | 327 | 36.03 | 1.00 | 5.00 | 1 | 1.0 | 2.00 |
NT0339.06 | 29 | 37 | 375 | 33.57 | 1.00 | 5.00 | 1 | 6.0 | 4.00 |
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Sample No. | B* | ||||||||
NT0339.01 | 2 | ||||||||
NT0339.02 | 3 | ||||||||
NT0339.03 | 2 | ||||||||
NT0339.04 | 2 | ||||||||
NT0339.05 | 2 | ||||||||
NT0339.06 | 2 |
The fact sheet was created on 19.04.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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