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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 1724 - 002 | |||||
| (Last updated 16.feb.2005) | |||||
Name of Deposit Area : Grunntjørna II |
| (Object Id : 1724,002,00,00) |
| Location |
| County : | Nord-Trøndelag (17) | Municipality : | Verran (1724) |
| Map 1:50000: | Holden (1623-2) | Map 1:250000: | Namsos |
| Marking point: | Longitude: | 10.9185430 | Latitude: | 64.0327350 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 593719 m. | Y-coord: | 7102072 m. |
|
|
| Commodity |
| Main Type: | Ferrous metals(Fe, Mn, Ti) | Sub Type: | Iron | |
| Element(s): | Fe |
| Production |
| Activity: | Pitting | Reserves: | ||
| Prod. method: | Production: | |||
| Prod. status: | Volume of dump: | 100 m3 |
| Importance |
| Public: | Little Importance (reg. 18.02.2015) |
| Economical: | Minor interest , (Confirmed 16.feb.2005 by Agnes Raaness) |
Operations |
| From - To | Activity | Comments | |
| 1908 - 1910 | Geophysics | ||
| 1910 - 1910 | Core drilling | ||
| 1952 - 1952 | Geophysics | ||
| 1953 - 1953 | Geophysics |
Mineralization |
| Era: | Paleozoic | Period: | Ordovician | |
| Dating: | Method: | |||
| 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: | 255 / 80 | 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 | Chlorite | Subordinate mineral (1-10%) | |
| Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
| Gangue mineral | Plagioclase | 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 |
|
| Metamorphic facies :Greenschist |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :255 / 80 | 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. Hagengruben er sannsynligvis drevet på samme jernformasjon som Hans-Hermangruben. UTM 93.80 02.28: Røsken er 15x3x3 m med 100 m3 tipp. 1 m mektig finkornet, massiv magnetitt med bånd av magnetkis, svovelkis og litt kobberkis (prøve 01 og 02). Også noen smale magnetittbånd og -linser i sideberget, som er tuffittisk skifer. Kalkspat og svovelkis på sprekker i malmsonen. UTM 94.00 02.28: Ca. 1 m mektig jernformasjon i bekken hvor foliasjonen er 5/10. Ifølge gamle rapporter ligger Bertelgruben mellom Hagengruben og Ørngruben, nord for Grunntjørna. Den ble ikke funnet ved befaringen. |
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 | ||||
| NT0032.01 | Bedrock |
|
||||
| NT0032.02 | Bedrock |
|
| NB! All analyse values are shown at the end of the printout.: |
Name of Locality : Skjerp 1 |
| (Object Id : 1724,002,01,00) |
| Location |
| County : | Nord-Trøndelag (17) | Municipality : | Verran (1724) |
| Map 1:50000: | Holden (1623-2) | Map 1:250000: | Namsos |
| Marking point: | Longitude: | 10.9226350 | Latitude: | 64.0326810 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 593919 m. | Y-coord: | 7102072 m. |
|
|
| Commodity |
| Main Type: | Ferrous metals(Fe, Mn, Ti) | Sub Type: | Iron | |
| Element(s): | Fe |
| Production |
| Activity: | Pitting | Reserves: | ||
| Prod. method: | Production: | |||
| Prod. status: | Volume of dump: |
Analyse Results |
| from |
| Deposit Area 1724 - 002 Grunntjørna II |
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# |
| NT0032.01 | Bedrock | 1083 | 22 | 3 | 338 | 95 | .5 | 27.0 |
| NT0032.02 | Bedrock | 712 | 19 | 2 | 232 | 71 | .3 | 19.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
| NT0032.01 | 2.0 | 5.0 | 52 | .2 | 1 | 1.00 | 2 | 2 | 11.60 |
| NT0032.02 | 2.0 | 4.0 | 29 | .2 | 1 | 1.00 | 2 | 2 | 8.09 |
| ------------------ |
| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| NT0032.01 | 23 | 23 | 292 | 34.35 | 1.00 | 5.00 | 2 | 6.0 | 2.00 |
| NT0032.02 | 38 | 20 | 326 | 33.82 | 1.00 | 5.00 | 1 | 5.0 | 18.00 |
| ------------------ |
| Sample No. | B* | ||||||||
| NT0032.01 | 2 | ||||||||
| NT0032.02 | 2 |
| The fact sheet was created on 19.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |