Norsk versjon
THE ???? DATABASE
Occurence 0 - 000 FEIL
(Object Id: )
(Last updated: 08.05.2006)

Location
County: Municipality: Mangler ()
Map 1:50000: Folldal (1519-2) Map 1:250000: Røros
Coordinate system: UTM-Zone 33 - EUREF89/WGS84
East: 559500 m. North: 6891950 m.
Longitude: 10.1417150 Latitude: 62.1533160
Show on map

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: Test mining Reserves:
Operating method: Open pit and underground mining Historical production:


Operations
From - To Activity Comments
Test mining Company/Institution :?
1959 - 1959 Geophysics Company/Institution :Geofysisk malmleting
1967 - 1967 Core drilling Company/Institution :Folldal Verk A/S
1990 - 1993 Detail mapping Company/Institution :T. Bjerkgård, University of Oslo
1999 - 1999 Sampling Company/Institution :NGU mineralressurser

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form:
Main texture: Banded Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration: Sericitisation
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Trondheim Nappe Complex
Tectonic complex: Meråker Nappe
Igneous complex:
Group: Fundsjø Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Sericite Major mineral (>10%)
Gangue mineral Apatite Accessory mineral (<1%)
Gangue mineral Garnet Accessory mineral (<1%)
Gangue mineral Chlorite Accessory mineral (<1%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Sphalerite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Accessory mineral (<1%)
Ore mineral Rutile Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Wall rock Quartz-albite schist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist
Wall rock Banded chlorite schist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :207 / 51 Post-mineralisation ;...Effect :Controls
Wall rock Fold axis Dir./Plunge :311 / 58 Post-mineralisation ;...Effect :Controls

Information(s) in free text format
Free text
Brendryen eller Grimsbu-skjerpene ligger i skogen, ca 1 km vest for Grimsbu. Skjerpene ligger like ved en god tømmervei, og er således lett å finne. Det er her en rekke mindre groper og en synk over en lengde på ca. 110 meter i NNØ-SSV retning. Det er også to røsker henholdsvis 100 m mot NØ og 200 m mot SV på samme sonen fra hovedskjerpet. Mineraliseringen har således en utbredelse på minst 300 m. Lengst mot nord er en 3x2 m vid og 2 m dyp grop. Tippen utenfor er ca.15 kbm. Mineralisering her består av cm-tykke bånd med finkornet pyritt impregnert i kvarts-sericittskifer. Lokalt er det enkelte anrikninger av sinkblende i mer kvartsrike soner (Prøve HE0068.01-tipp-prøve, HE0068.02 - fastfjellsprøve). Neste grop befinner seg 12 m i sørlig retning og er 2x2 m vid og 1 m dyp. Mineralisering her er pyritt og magnetkis i kvarts-sericittskifer. Videre 15 m mot sør er det en vannfylt synk med omriss 3x3 m. Tippvolumet her er ca. 75 kbm, hvilket innebærer at den er max. 5 m dyp. Dette er den største driften i området. Blokkene på tippen består av mm-bånd av pyritt og dels magnetkis i kvarts-sericittskifer (Prøve HE0068.03). Enkelte bånd inneholder litt sinkblende. Skiferen her har en sterkt utviklet lineasjon i NV retning, noe som nok også kontrollerer retningen på mineraliseringen. Mineraliseringen har her en mektighet på omlag 50 m. 20 m mot sør fra synken er det et større innhugg i en blotning, ca 5x3 m bredt og 0.5-1 m dypt. Tippvolumet er ca. 20 kbm. Mineralisering er også her pyritt-impregnasjon i kvarts-sericittskifer. Ca. 40 m videre mot SSV er det gjort to innhugg i en større blotning. Dette er i veikanten. Innhuggene er henholdsvis 2x2x0.5 m og 2x1x1 m og det er en tipp på ca. 10 kbm. Mineralisering består av pyritt-magnetkis impregnasjon, dels anriket i bånd, i kvarts-sericittskifer. Lokalt opptrer noe sinkblende og kobberkis. På vestsiden av veien, 20 m mot SSV er det gjort et lite innhugg, 2x1 m i en liten skrent. Mineralisering består av pyritt impregnasjon i kvarts-sericitt skifer og dels pyritt-magnetkis impregnasjon i kvarts. Driften her skriver seg fra rundt århundreskiftet (?). Det ble gjort bakkegeofysikk over feltet i 1959, noe som viste... To borhull ble boret ned fra nordsiden av forekomsten i 1967. Disse påviste kun svak impregnasjon under skjerpene (<0.1 % Cu og 0.1-0.4 % Zn) med vesentlig pyritt og noe magnetkis i kvarts-sericittskifer og kvarts-kloritt- sericittskifer. Imidlertid ble det ikke tatt hensyn til strukturer, da det ble boret, så det kan være at borhullene ikke traff den rikeste delen av mineraliseringen.

Bibliography:
From NGU's Reference Archive:
Riiber, Carl C. , 1923
Rapporter over kis -og kobbergruber og skjerp i Foldal, Dovre og Alvdal herreder.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3194;25 pages
Abstract:
Rapporten omfatter følgende gruver og skjerp: I. Foldals verks gruber: a. Hovedgruben. b. Nordre Gjeitryggen grube. c. Søndre jetryggen grube, d. Grev Moltke grube. e. Grimsdalen grube. f. Storthaab grube. g. Boksberg grube. II. Statens kisanvisninger: a. Skjerp øst for Foldals verks hovedgrube. b. Stretlien skjerp. c. Grimsdalen skjerp. III. Grimsbo kisskjerp. IV. Rødalens kobbergrube. V. Tronfjeldets kobbergruber. VI. Verkjendalens kisfelt. Rapporten beskriver forekomstenes beliggenhet, geologiske forhold, malmen, resultater av undersøkelser (boringer, analyser osv.), salgspriser, historiske forhold, juridiske forhold og kraftsituasjonen. Forekomstnr.: 1. 10963, 2. 10973 og 3. 10991. Forekomstens navn og koordinater: 1. Folldal 32 5521 68908, 2. Verkensdalen 32 5281 68816, 3. Gamle Tron 32 5862 68910.

Singsaas, P. , 1959
Geofysisk undersøkelse 1. Grimsdal Grube - Husumskogen 2. Verket - Knutshovdet 3. Søndre Gjetryggen Grube - Grimsbu.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.173;10 pages

Bjerkgård, Terje , 1995
The stratabound massive sulfide deposits in the Folldal area, southern Trondheim region Caledonides, Norway.
;UiO Geologisk fellesråd;AVHANDLING

Bjerkgård, Terje; Bjørlykke, Arne , 1994
The stratabound sulphide deposits in the Folldal area, Southern Trondheim Region, Norway
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (4);213-237 pages
Abstract:
Frie emneord: Lagdelt, Malmgenese Five strata-bound massive sulphide deposits are situated at three different stratigraphic levels in the volcanogenic Fundsjø group in the Folldal area. The deposits are hosted in metabasalts, metarhyodacites and volcanoclastic rocks and belong to the Cu-Zn class of volcanic-associated massive sulphide deposits. The metal content of the deposits indicates that the sources of metals are underlying strata, possibly with a contribution from intrusives. Wall rock alteration varies according to differences in host rocks, and is probably a result of chemical variations of the host rocks, temperature differences and proximity to the hydrothermal vent. The clustering of deposits in the Folldal area is considered to be due to the occurrence of a large sub- volcanic trondhjemitic intrusion which acted as the major heat engine for convection. The small size of the deposits might be related to the shallow level of the intrusion.

References not to be found in NGU's Reference Archive.:
Bjerkgård, T. & Bjørlykke, A. 1995: Geology of the Folldal area, southern Trondheim Region Caledonides, Norway. NGU bull. 426, p.53-75.


Bjerkgård, T. & Bjørlykke A.,1996: Sulfide deposits in Folldal, Southern Trondheim Region Caledonides, Norway: Source of metals and wall-rock alterations related to host rocks. Economic Geology vol.91, p.676-696.

Fieldsamples
Sample No. Sample type Miscellanrous
HE0068.01 Dump
Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3
Comment: Banded pyrite impregnation in quartz-sericite schist
No. of registrated element analyses = 1
HE0068.02 Bedrock
Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3
Comment: Banded pyrite impregnation in chlorite-bearing quartz-sericite schist.
No. of registrated element analyses = 1
HE0068.03 Dump
Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3
Comment: Bands of pyrite (mm-scale) in quartz-sericite schist with strong lineation.
No. of registrated element analyses = 1
HE0068.04 Dump
Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3
Comment: Pyrite impregnation in quartz sericite schist.
No. of registrated element analyses = 1
HE0068.05 Dump
Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3
Comment: Pyrite impregnation in quartz sericite schist.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Brendryen
(Object Id: 12406 16,01,00)

Location
County: Municipality: Mangler ()
Map 1:50000: Folldal (1519-2) Map 1:250000: Røros
Coordinate system: UTM-Zone 33 - EUREF89/WGS84
East: 559580 m. North: 6892040 m.
Longitude: 10.1432800 Latitude: 62.1541110
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Sulphides
Element(s): Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Operations
From - To Activity Comments
Pitting Company/Institution :?
1990 - 1993 Detail mapping Company/Institution :T. Bjerkgård, University of Oslo

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Sericite Major mineral (>10%)
Ore mineral Pyrite Major mineral (>10%)

Lithology:
Relationship Rock Origin
Wall rock Banded quartz-albite schist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist
Wall rock Banded chlorite schist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist

Information(s) in free text format
Free text
Dette er en røskegrøft ca. 10 m lang og 1.5 m dyp i fortsettelsen av Brendryen skjerpene, ca. 100 m mot NØ. Mineralisering består av svakt pyritt-impregnert kvarts-sericittskifer.

Bibliography:
From NGU's Reference Archive:
Bjerkgård, Terje; Bjørlykke, Arne , 1994
The stratabound sulphide deposits in the Folldal area, Southern Trondheim Region, Norway
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (4);213-237 pages
Abstract:
Frie emneord: Lagdelt, Malmgenese Five strata-bound massive sulphide deposits are situated at three different stratigraphic levels in the volcanogenic Fundsjø group in the Folldal area. The deposits are hosted in metabasalts, metarhyodacites and volcanoclastic rocks and belong to the Cu-Zn class of volcanic-associated massive sulphide deposits. The metal content of the deposits indicates that the sources of metals are underlying strata, possibly with a contribution from intrusives. Wall rock alteration varies according to differences in host rocks, and is probably a result of chemical variations of the host rocks, temperature differences and proximity to the hydrothermal vent. The clustering of deposits in the Folldal area is considered to be due to the occurrence of a large sub- volcanic trondhjemitic intrusion which acted as the major heat engine for convection. The small size of the deposits might be related to the shallow level of the intrusion.

Name of Locality: Brendryen
(Object Id: 12407 16,02,00)

Location
County: Municipality: Mangler ()
Map 1:50000: Folldal (1519-2) Map 1:250000: Røros
Coordinate system: UTM-Zone 33 - EUREF89/WGS84
East: 559400 m. North: 6891760 m.
Longitude: 10.1397320 Latitude: 62.1516260
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Sulphides
Element(s): Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Operations
From - To Activity Comments
Pitting Company/Institution :?
1990 - 1993 Detail mapping Company/Institution :T. Bjerkgård, University of Oslo

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Sericite Major mineral (>10%)
Ore mineral Pyrite Major mineral (>10%)

Lithology:
Relationship Rock Origin
Wall rock Banded quartz-albite schist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist
Wall rock Banded chlorite schist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist

Information(s) in free text format
Free text
Dette er en røsk, ca 3 m bred og inntil 1 m dyp, nærmest som et påhugg i en blotning. Mineralisering består av svakt pyritt-impregnert kvarts-sericittskifer og sonen er ca. 10 m mektig i blotning. Mineraliseringen er fortsettelsen av Brendryen mineraliseringen mot SV og ligger ca. 200 m unna.

Bibliography:
From NGU's Reference Archive:
Bjerkgård, Terje; Bjørlykke, Arne , 1994
The stratabound sulphide deposits in the Folldal area, Southern Trondheim Region, Norway
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (4);213-237 pages
Abstract:
Frie emneord: Lagdelt, Malmgenese Five strata-bound massive sulphide deposits are situated at three different stratigraphic levels in the volcanogenic Fundsjø group in the Folldal area. The deposits are hosted in metabasalts, metarhyodacites and volcanoclastic rocks and belong to the Cu-Zn class of volcanic-associated massive sulphide deposits. The metal content of the deposits indicates that the sources of metals are underlying strata, possibly with a contribution from intrusives. Wall rock alteration varies according to differences in host rocks, and is probably a result of chemical variations of the host rocks, temperature differences and proximity to the hydrothermal vent. The clustering of deposits in the Folldal area is considered to be due to the occurrence of a large sub- volcanic trondhjemitic intrusion which acted as the major heat engine for convection. The small size of the deposits might be related to the shallow level of the intrusion.


The fact sheet was created on 05.05.2024

Copyright © 2024 Geological Survey of Norway