(Last updated: 01.07.1998)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Occurence 5027 - 014 Fora | |||||
| (Object Id: 4440) (Last updated: 01.07.1998) |
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| Location |
| County: | Trøndelag | Municipality: | Midtre Gauldal (5027) |
| Map 1:50000: | Budal (1620-4) | Map 1:250000: | Røros |
| Coordinate system: | EU89-UTM Zone 32 |
| East: | 589336 m. | North: | 6972357 m. |
| Longitude: | 10.7560860 | Latitude: | 62.8703030 |
| 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: | Not Assessed (reg. 18.02.2015) |
| Resources and production |
| Activity: | Exploration | Reserves: | ||
| Operating method: | Historical production: |
Operations |
| From - To | Activity | Comments | |
| 1997 - 1997 | Sampling | Company/Institution :NGU-Malmreg. |
Mineralization |
| Genesis: | Sedex | Form: | ||
| Main texture: | Banded | Min. distribution: | Disseminated (<20 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: |
| Strike/Dip: | 50 / 20 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Period: |
| Province: | Caledonides | |
| Geotec.unit: | Trondheim Nappe Complex | |
| Tectonic complex: | Gula Nappe | |
| Igneous complex: |
| Group: | Gula | Formation: | Singsås |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Biotite | Major mineral (>10%) | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Graphite | Major mineral (>10%) | |
| Ore mineral | Pyrrhotite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Subordinate mineral (1-10%) | |
| Ore mineral | Pyrargyrite | Accessory mineral (<1%) | |
| Ore mineral | Sphalerite | Accessory mineral (<1%) | |
| Ore mineral | Chalcopyrite | Accessory mineral (<1%) | |
| Ore mineral | Galena | Accessory mineral (<1%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Black schist | Sedimentary Original rock :Bituminous silty mudstone |
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| Metamorphic facies :Greenschist |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :50 / 20 | Post-mineralisation ;...Effect :None | |
| Host rock | Mineral lineation | Dir./Plunge :135 / 20 | Post-mineralisation ;...Effect :None |
Information(s) in free text format |
| Description |
| Mineraliseringen har utgående i en veiskjæring. Den er minst 1 m mektig og består av kvartsrik svartskifer med impregnasjon og lokale semimassive partier av magnetkis og litt svovelkis og kobberkis. Sulfidene sitter i mm-tynne, konforme og småfoldede stringere. Svartskiferen fører glassklar kvarts i linser og uregelmessige ansamlinger. Mineraliseringen er sannsynligvis ikke blottet andre steder enn i den ufullstendige avblotningen i veikanten, hvor heller ikke sidestein er blottet. |
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. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| ST0238.01 | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 5027 - 014 Fora |
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# |
| ST0238.01 | Bedrock | 350 | 532 | 66 | 25 | 165 | 1.0 | 2.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
| ST0238.01 | 3.0 | 6.0 | 2 | 3.9 | 14 | 32.00 | -3 | 8 | 6.93 |
| ------------------ |
| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| ST0238.01 | 123 | 43 | 2333 | 12.32 | 5.00 | 14.00 | 8 | 7.0 | 8.00 |
| ------------------ |
| Sample No. | B* | ||||||||
| ST0238.01 | -3 |
| The fact sheet was created on 30.04.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |