(Last updated: 16.05.2006)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Occurence 5042 - 022 Merkestangen | |||||
| (Object Id: 347) (Last updated: 16.05.2006) |
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| Location |
| County: | Trøndelag | Municipality: | Lierne (5042) |
| Map 1:50000: | Tunnsjøen (1924-3) | Map 1:250000: | Grong |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 426582 m. | North: | 7180819 m. |
| Longitude: | 13.4577300 | Latitude: | 64.7440090 |
| 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: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1996 - 1996 | Sampling | Company/Institution :NGU |
Mineralization |
| Era: | Paleozoic | Period: | Ordovician | |
| Genesis: | Volcex | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: | No country rock alteration |
| Strike/Dip: | 250 / 10 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | Køli Nappe Complex | |
| Tectonic complex: | Gjersvik Nappe | |
| Igneous complex: | Skorovass Complex |
| Group: | Gjersvik | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Epidote | Major mineral (>10%) | |
| Gangue mineral | Garnet | Subordinate mineral (1-10%) | |
| Gangue mineral | Chlorite | Subordinate mineral (1-10%) | |
| Ore mineral | Magnetite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Wall rock | Greenstone | Extrusive Original rock :Basalt |
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| Metamorphic facies :Greenschist |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Wall rock | Foliation | Strike/Dip :250 / 10 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
| Free text |
| Forekomsten består av en rekke lag med massiv magnetitt som er opptil 1.5 m mektige. De er godt blottet oppover langs Brennbergbekken, men det er ingen tegn til skjerpeaktivitet av betydning. Jernhorisontene er dels båndete og veksler med epidot, kvarts og granatrikere bånd. De ligger i lys grønnstein. I tillegg er en rekke magnetittmineraliseringer kort omtalt av Oftedahl (1958) fra Mariafjell-området og vestover mot Tunnsjøen. Hovedforekomsten er valgt ved det nederste, tilnærmet flattliggende magnetitt-laget som ligger ca. 70 m ovenfor hovedveien langs nordvestsida av Tunnsjøen. Det er 1 m mektig og i tillegg til finkornet magnetitt opptrer smale epidot- og granat-rikere bånd. Lys grønnstein finnes både over og under magnetitt-laget. |
Bibliography: |
| From NGU's Reference Archive: |
| Oftedahl, Christoffer , 1958 |
| Oversikt over Grongfeltets skjerp og malmforekomster. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.202;1-75 + fo pages |
| Abstract: | |
| Ore occurences of the Grong area: In the period 1910-1918 a great number of ore occurences were discovered in the Grong area. The late state geologist Steinar Foslie mapped the area in the years 1922-1931. Foslie also mapped all claims and occurences and made special field investigations in a few cases. This book presents a survey of all occurences chiefly based on the field observations of Foslie. In addition the present author has done some field work in connection with the three large deposits, Joma, Skorovass, and Gjersvik. The map, Plate 1, shows the areal geology and the location of the occurrences, numbered from 1 to 131. the ore of the occurrences is chiefly pyrite. The larger occurrences also contain some chalcopyrite and sphalerite etc. and the smaller occurrences contain ither pure pyrite with some magnetite. The Joma deposit (No. 1), contains about 15.5 mill. tons of ore. The ore zone forms an arc and is situated within a thick series of greenstones (Fig. 1). The Skorovass mine (No. 2), contains about 7,5 mill. tons of ore. The deposit is situated in a greenstone complex (Fig. 7), and is immediately surrounded by asid tuffs of quartz keratophyric composition (Table 1). |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| JS96018 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Skjerp 1 |
| (Object Id: 519 22,01,00) |
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| Location |
| County: | Trøndelag | Municipality: | Lierne (5042) |
| Map 1:50000: | Tunnsjøen (1924-3) | Map 1:250000: | Grong |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 426627 m. | North: | 7179869 m. |
| Longitude: | 13.4591590 | Latitude: | 64.7354970 |
| Show on map |
|
|
| Resource |
| Resource Type: | Ferrous metals(Fe, Mn, Ti) | Resource Subtype: | Iron | |
| Element(s): | Fe |
| Resources and production |
| Activity: | Exploration | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1996 - 1996 | Sampling | Company/Institution :NGU |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Garnet | Subordinate mineral (1-10%) | |
| Ore mineral | Magnetite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Accessory mineral (<1%) |
Lithology: |
| Relationship | Rock | Origin | |
| Wall rock | Greenstone | Extrusive Original rock :Basalt |
|
| Metamorphic facies :Greenschist |
Information(s) in free text format |
| Free text |
| Magnetitt-laget er flattliggende og kun 30 cm mektig. Svak disseminasjon av pyritt finnes i magnetitt-lage som overlagres av lys grønnstein. |
Bibliography: |
| From NGU's Reference Archive: |
| Oftedahl, Christoffer , 1958 |
| Oversikt over Grongfeltets skjerp og malmforekomster. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.202;1-75 + fo pages |
| Abstract: | |
| Ore occurences of the Grong area: In the period 1910-1918 a great number of ore occurences were discovered in the Grong area. The late state geologist Steinar Foslie mapped the area in the years 1922-1931. Foslie also mapped all claims and occurences and made special field investigations in a few cases. This book presents a survey of all occurences chiefly based on the field observations of Foslie. In addition the present author has done some field work in connection with the three large deposits, Joma, Skorovass, and Gjersvik. The map, Plate 1, shows the areal geology and the location of the occurrences, numbered from 1 to 131. the ore of the occurrences is chiefly pyrite. The larger occurrences also contain some chalcopyrite and sphalerite etc. and the smaller occurrences contain ither pure pyrite with some magnetite. The Joma deposit (No. 1), contains about 15.5 mill. tons of ore. The ore zone forms an arc and is situated within a thick series of greenstones (Fig. 1). The Skorovass mine (No. 2), contains about 7,5 mill. tons of ore. The deposit is situated in a greenstone complex (Fig. 7), and is immediately surrounded by asid tuffs of quartz keratophyric composition (Table 1). |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| JS96019 | Bedrock |
|
| NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Skjerp 2 |
| (Object Id: 520 22,02,00) |
|
|
| Location |
| County: | Trøndelag | Municipality: | Lierne (5042) |
| Map 1:50000: | Tunnsjøen (1924-3) | Map 1:250000: | Grong |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 426637 m. | North: | 7180924 m. |
| Longitude: | 13.4588310 | Latitude: | 64.7449630 |
| Show on map |
|
|
| Resource |
| Resource Type: | Ferrous metals(Fe, Mn, Ti) | Resource Subtype: | Iron | |
| Element(s): | Fe |
| Resources and production |
| Activity: | Exploration | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1996 - 1996 | Sampling | Company/Institution :NGU |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Garnet | Subordinate mineral (1-10%) | |
| Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
| Ore mineral | Magnetite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Wall rock | Greenstone | Extrusive Original rock :Basalt |
|
| Metamorphic facies :Greenschist |
Information(s) in free text format |
| Free text |
| Et flattliggende, 15-30 cm mektig lag med båndet magnetittmalm er blottet i bekken. Chert-liknende linser og bånd finnes i magnetittsonen som dels er noe grønnlig. |
Bibliography: |
| From NGU's Reference Archive: |
| Oftedahl, Christoffer , 1958 |
| Oversikt over Grongfeltets skjerp og malmforekomster. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.202;1-75 + fo pages |
| Abstract: | |
| Ore occurences of the Grong area: In the period 1910-1918 a great number of ore occurences were discovered in the Grong area. The late state geologist Steinar Foslie mapped the area in the years 1922-1931. Foslie also mapped all claims and occurences and made special field investigations in a few cases. This book presents a survey of all occurences chiefly based on the field observations of Foslie. In addition the present author has done some field work in connection with the three large deposits, Joma, Skorovass, and Gjersvik. The map, Plate 1, shows the areal geology and the location of the occurrences, numbered from 1 to 131. the ore of the occurrences is chiefly pyrite. The larger occurrences also contain some chalcopyrite and sphalerite etc. and the smaller occurrences contain ither pure pyrite with some magnetite. The Joma deposit (No. 1), contains about 15.5 mill. tons of ore. The ore zone forms an arc and is situated within a thick series of greenstones (Fig. 1). The Skorovass mine (No. 2), contains about 7,5 mill. tons of ore. The deposit is situated in a greenstone complex (Fig. 7), and is immediately surrounded by asid tuffs of quartz keratophyric composition (Table 1). |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| JS96020 | Bedrock |
|
| NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Skjerp 3 |
| (Object Id: 521 22,03,00) |
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|
| Location |
| County: | Trøndelag | Municipality: | Lierne (5042) |
| Map 1:50000: | Tunnsjøen (1924-3) | Map 1:250000: | Grong |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 426837 m. | North: | 7181079 m. |
| Longitude: | 13.4629510 | Latitude: | 64.7463960 |
| Show on map |
|
|
| Resource |
| Resource Type: | Ferrous metals(Fe, Mn, Ti) | Resource Subtype: | Iron | |
| Element(s): | Fe |
| Resources and production |
| Activity: | Exploration | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1996 - 1996 | Sampling | Company/Institution :NGU |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Epidote | Subordinate mineral (1-10%) | |
| Ore mineral | Magnetite | Major mineral (>10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Wall rock | Greenstone | Extrusive Original rock :Basalt |
|
| Metamorphic facies :Greenschist |
Information(s) in free text format |
| Free text |
| Flere 10-40 cm mektige, flattliggende magnetittlag finnes i mindre fossestryk i Brennbergbekken. De oppter som linser og kan være repetert på grunn av flattliggende isoklinal foldning. Den samme lyse grønnsteinen som ved de andre lokalitetene langs bekken, er vertsbergarten. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| JS96021 | Bedrock |
|
| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 5042 - 022 Merkestangen |
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# |
| JS96018 | Bedrock | 156 | 105 | -3 | 25 | 85 | .3 | 3.0 |
| JS96019 | Bedrock | 200 | 40 | -3 | 17 | 40 | -.3 | 2.0 |
| JS96020 | Bedrock | 174 | 99 | 14 | 37 | 131 | -.3 | -1.0 |
| JS96021 | Bedrock | 245 | 71 | -3 | 20 | 82 | -.3 | 3.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | Rh# | As* | Cd* | Ba* | Mo* | Sb* | Bi* |
| JS96018 | 4.0 | 3.0 | -1.0 | 3 | 2.1 | 6 | -1.00 | -2 | -2 |
| JS96019 | 2.0 | 3.0 | -1.0 | 2 | 1.3 | 4 | -1.00 | -2 | -2 |
| JS96020 | -1.0 | -1.0 | -1.0 | 2 | 2.3 | 7 | -1.00 | -2 | -2 |
| JS96021 | 4.0 | 3.0 | -1.0 | 11 | 2.6 | 7 | -1.00 | -2 | -2 |
| ------------------ |
| Sample No. | S% | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* |
| JS96018 | -.10 | 134 | 46 | 3325 | 24.95 | 7.00 | -5.00 | -2 | 71.0 |
| JS96019 | .09 | 140 | 26 | 1425 | 25.03 | 3.00 | -5.00 | 3 | 44.0 |
| JS96020 | .15 | 244 | 54 | 2602 | 30.13 | 6.00 | -5.00 | -2 | 41.0 |
| JS96021 | -.01 | 169 | 34 | 3963 | 29.01 | 9.00 | 7.00 | -2 | 31.0 |
| ------------------ |
| Sample No. | La* | B* | |||||||
| JS96018 | 3.00 | -3 | |||||||
| JS96019 | 2.00 | -3 | |||||||
| JS96020 | 1.00 | -3 | |||||||
| JS96021 | 12.00 | -3 |
| The fact sheet was created on 06.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |