(Last updated: 16.05.2006)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Occurence 5022 - 004 Skamfjell | |||||
| (Object Id: 4267) (Last updated: 16.05.2006) |
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| Location |
| County: | Trøndelag | Municipality: | Rennebu (5022) |
| Map 1:50000: | Rennebu (1520-1) | Map 1:250000: | Røros |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 537329 m. | North: | 6980407 m. |
| Longitude: | 9.7357570 | Latitude: | 62.9515730 |
| Show on map |
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| Resource |
| Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Sulphides | |
| Element(s): | Kis |
| 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 | |
| 1976 - 1976 | Geology | Company/Institution :O. Nilsen, UiO | |
| 1997 - 1997 | Sampling | Company/Institution :NGU-Malmreg. |
Mineralization |
| Genesis: | Volcex | Form: | Lens | |
| Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: |
| Strike/Dip: | 260 / 35 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Period: |
| Province: | Caledonides | |
| Geotec.unit: | Trondheim Nappe Complex | |
| Tectonic complex: | Støren Nappe | |
| Igneous complex: |
| Group: | Støren | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Amphibole | Major mineral (>10%) | |
| Gangue mineral | Quartz | Subordinate mineral (1-10%) | |
| Ore mineral | Pyrrhotite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Major mineral (>10%) | |
| Ore mineral | Magnetite | Subordinate mineral (1-10%) | |
| Ore mineral | Ilmenite | Accessory mineral (<1%) | |
| Ore mineral | Chalcopyrite | Accessory mineral (<1%) |
Lithology: |
| Relationship | Rock | Origin | |
| Wall rock | Trondhjemite | Intrusive Original rock :Trondhjemite |
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| Metamorphic facies :Amphibolite | |||
| Wall rock | Amphibolite | Extrusive Original rock :Basalt |
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| Metamorphic facies :Amphibolite |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Wall rock | Foliation | Strike/Dip :260 / 35 | Post-mineralisation ;...Effect :None |
Information(s) in free text format |
| Description |
| Grensesonen mellom Størengruppens grønnstein/amfibolitt og det vel 2.5 km brede trondhjemittmassivet over Skamfjellet og Jorfjellet er sterkt sulfidanriket, og det er skjerpet på kismineraliseringer i begge de nevnte fjellpartier. Vest for, og nær toppen av Skamfjellet er det utført ubetydelige røskingsarbeider langs en 4-500 m lang og 50 m bred rustsone i en mørk, finkornig amfibolittisk grønnstein. I rustsonen opptrer små linser (3-10 m lange og 0.5-1 m mektige) av massiv, finkornig svovelkis og magnetkis i magnetkis-magnetitt-ilmenitt-impregnert amfibolitt. I det østligste blotningsområdet ("hovedskjerpet") kan det observeres tre mineraliseringstyper i de noe uregelmessig forløpende massivsulfidlinsene / -lagene: 1) Finkornig massiv svovelkis (prøve 01). 2) Finkornig massiv svovelkis og magnetkis, der de opptrer i alternerende bånd i cm-skala (prøve 02). 3) Middelskornig semimassiv til massiv svovelkis og magnetkis, der større (2-4 mm) anhedrale svovelkis-"kuler" opptrer i en finkornig magnetkis(-amfibol)-grunnmasse (prøve 03). Kontakten til trondhjemittmassivet er blottet 30 m mot sør. Rustsonen er overdekket mot vest, inntil den dukker opp i det vestlige blotningsområdet (skjerp 1), i kant av ei større myr. Det er også her røsket litt i samme rustsone med samme mineraliseringstyper som ovenfor nevnt. Her er imidlertid foliasjon og retning på kislinsene/-lagene mer konstant, nemlig 260/35. |
Bibliography: |
| From NGU's Reference Archive: |
| Nilsen, Odd , 1978 |
| Caledonian sulphide deposits and minor iron-formations from the southern Trondheim region, Norway. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.340;35-85 + k pages |
| Abstract: | |
| Within the southern and central parts of the Trondheim region of the Norwegian Caledonides a great number of small, stratabound cupriferous pyrite deposits are confined to mafic metavolcanics of the Gula, Støren and Fundsjø Groups of the Lower Palaeozoic succession. The deposits occuring within, or in close contact with the metavolcanics are characterized by their association with minor manganiferous oxide/silicate iron-formations - better known as "vasskis" ore type - within the metamorphic low-grade areas. The iron-fprmations of the metamorphic higher grade terrains on the other hand, which are extensively developed within the Gula Group, are mostly of a pyrrhotitic sulphide/silicate type and sulphurization processes are thought to have played an important role during the metamorphism. The pyrite deposits occurring adjacent to the metavolcanics bear no relationship to the iron-formations. They are embedded in pelitic, often carbonaceous assemblages (Gula Group) or within tuffitic members of the volcanogene Støren Group, and they are thought to represent re-sedimented (reworked) deposits. The pyrite deposits display varying degree of metamorphic reconstitution and a tectonic control has apparently determined their disc- or ruler-shaped morphology. |
| References not to be found in NGU's Reference Archive.: |
| Nilsen, O. & Rohr-Torp, E. 1976: Rapport fra malmgeologiske undersøkelser i Rennebu sommeren 1976. BV 3913. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| ST0064.01 | Bedrock |
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| ST0064.02 | Bedrock |
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| ST0064.03 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Name of Locality: |
| (Object Id: 10086 4,01,00) |
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| Location |
| County: | Trøndelag | Municipality: | Rennebu (5022) |
| Map 1:50000: | Rennebu (1520-1) | Map 1:250000: | Røros |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 536939 m. | North: | 6980237 m. |
| Longitude: | 9.7280340 | Latitude: | 62.9500870 |
| Show on map |
|
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| Resource |
| Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Sulphides | |
| Element(s): | Kis |
Analyse Results |
| from |
| Deposit Area 5022 - 004 Skamfjell |
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# |
| ST0064.01 | Bedrock | 33 | 19 | 17 | 15 | 1 | .5 | 14.0 |
| ST0064.02 | Bedrock | 198 | 165 | 4 | 5 | 52 | .8 | 13.0 |
| ST0064.03 | Bedrock | 252 | 259 | 14 | 8 | 51 | .6 | 6.0 |
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| Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
| ST0064.01 | 5.0 | 5.0 | 34 | -.2 | 3 | 4.00 | -3 | 12 | 35.70 |
| ST0064.02 | 3.0 | 4.0 | 7 | -.2 | -1 | -1.00 | -3 | -3 | 32.30 |
| ST0064.03 | 2.0 | 2.0 | 20 | -.2 | -1 | -1.00 | -3 | -3 | 25.20 |
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| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| ST0064.01 | 13 | 3 | 68 | 14.26 | 4.00 | -8.00 | -2 | 1.0 | 1.00 |
| ST0064.02 | 39 | 8 | 131 | 26.40 | 5.00 | -8.00 | -2 | 2.0 | 3.00 |
| ST0064.03 | 57 | 17 | 146 | 26.84 | 6.00 | -8.00 | -2 | 4.0 | 6.00 |
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| Sample No. | B* | ||||||||
| ST0064.01 | -3 | ||||||||
| ST0064.02 | -3 | ||||||||
| ST0064.03 | 3 |
| The fact sheet was created on 03.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |