Norsk versjon
THE ORE DATABASE
Deposit 5022 - 017 Undal
(Object Id: 4280)
(Last updated: 15.02.2019)
Location
County: Trøndelag Municipality: Rennebu (5022)
Map 1:50000: Rennebu (1520-1) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 553598 m. North: 6965837 m.
Longitude: 10.0516770 Latitude: 62.8187950
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis Cu Zn Co
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves: 720 thousand tons
Operating method: Underground mining Historical production: 280 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Cu 1,2 % 20.06.2001
S 41 % 20.06.2001
Zn 1,9 % 20.06.2001

Operations
From - To Activity Comments
1668 - 1677 Regular production
1721 - 1721 Pitting
1750 - 1750 Pitting
1862 - 1862 Inspection Company/Institution :A. Ellefsen
1863 - 1876 Regular production
1910 - 1910 Pitting Company/Institution :Undal Værk
1910 - 1910 Inspection Company/Institution :G. Puntervold
1915 - 1922 Regular production Company/Institution :Undal Værk
1940 - 1940 Inspection Company/Institution :O.F. Borchgrevink
1942 - 1942 Geophysics Company/Institution :Gesellsch. f. prakt. Lagerstättenforsch.
1952 - 1959 Regular production Company/Institution :Killingdal Gruber A/S
1966 - 1971 Regular production Company/Institution :Killingdal Gruber A/S
1967 - 1969 Geology Company/Institution :P.A. Lindberg, UiO
1968 - 1968 Geophysics Company/Institution :A/S Undal Verk/Killingdal Grubeselskap
1968 - 1969 Core drilling Company/Institution :A/S Undal Verk/Killingdal Grubeselskap
1969 - 1969 Geology Company/Institution :I.J. Rui, UiO
1997 - 1997 Sampling Company/Institution :NGU-Malmreg.

Mineralization
Era: Paleozoic Period:
Genesis: Volcex Form: Ruler
Main texture: Massive Min. distribution: Massive (>50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration:
Strike/Dip: 5 / 45 Direction: 90
Plunge: 45
Stratigraphic classification of host rock
Era: Paleozoic Period:
Province: Caledonides
Geotec.unit: Trondheim Nappe Complex
Tectonic complex: Gula Nappe
Igneous complex:
Group: Gula Formation: Undal

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Hornblende Subordinate mineral (1-10%)
Gangue mineral Calcite Subordinate mineral (1-10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Graphite Subordinate mineral (1-10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Muscovite Subordinate mineral (1-10%)
Gangue mineral Feldspar Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Sphalerite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Ilmenite Accessory mineral (<1%)
Ore mineral Marcasite Accessory mineral (<1%)
Ore mineral Magnetite Accessory mineral (<1%)
Ore mineral Galena Accessory mineral (<1%)
Ore mineral Molybdenite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Wall rock Black schist Sedimentary
Original rock :Bituminous silty mudstone
Metamorphic facies :Greenschist
Wall rock Greenstone Extrusive
Original rock :Basalt
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :5 / 45 Post-mineralisation ;...Effect :None
Wall rock Primary layering Strike/Dip :5 / 45 Syn-mineralisation
Wall rock Fold axis Dir./Plunge :65 / 35 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
The Undal deposit is situated in a graphitic phyllite with minor greenstone which belongs to the so-called Undal Formation, which is interpreted as a tectonic mélange, situated between the Gula Group and the Støren Group in the Trondheim Nappe Complex. The deposit is about 600 m long and has the form of a thin ruler, about 70 m wide and 3–5 m thick. It is a pyritic ore body with subordinate chalcopyrite and sphalerite. Analysis of ore production yielded 1.15 % Cu, 1.86 % Zn, 43.2 % Fe and 41.1 % S. About 279 000 t ore was produced from the deposit, mainly between 1952 and 1971. The total tonnage of the deposit is estimated to about 1 Mt.

Bibliography:
From NGU's Reference Archive:
Ellefsen, A. , 1862
Undals Gruve
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1678;2 pages
Abstract:
Rapporten beskriver gruva og utførte arbeider.

Gullichsen, E.; Vogt, J.H.L. , 1899
Kisforkomster langs den prosjekterende Sell-Støren-jernbanen.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3945;14 pages
Abstract:
Rapporten er et særtrykk av Teknisk Ukeblad og beskriver kisforekomster på strekningen Sel-Støren. Avhandlingen er utarbeidet i forbindelse med forlengelsen av jernbanen på overnevnte strekning. Det er gitt en geografisk, malmgeologisk og historisk oversikt i tillegg til feltenes malmreserver, produksjonsevne og malmens mineralogi. Følgende gruver og malmfelt er behandlet: -Undal Kisgruve -Vårstiens kisfelt -Foldalens kisfelt -Kvikne Gruber. Helleskiferen i Oppdal blir også nevnt sammen med klebersteinforekomster i området (JS 85)

Puntervold, G. , 1910
Undals Værk.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1553;1 pages
Abstract:
Det er gjort befaring av forekomsten. Det er foretatt endel jordrøsking, men ingen kis av betydning er påtruffet. Man forbereder nu en nedsynkning til den gamle grubes kisleies fortsettelse. Dybden av den gamle grubes er etter kart fra 1882 mellom 50-60 meter. Gruben står nu under vann.

Brodtkorb, T. , 1925
Undal Gruve
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1643;4 pages
Abstract:
Rapporten beskriver kort forekomsten og malmens beskaffenhet. Rapporten inneholder analyser av malmen og en kartskisse over gruven.

Foslie, Steinar , 1926
Norges svovelkisforekomster.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.127;122 pages
Abstract:
This paper was written in English for the XIV International Geological Congress, Madrid 1926, as a part of its monograph on the Pyrite Resources of the World. The present Norwegian edition has nearly the same content. However, the geological review is a little more extensive, the production statistics have been carried a year forward, to the end of 1925, and some more illustrations are given. The English reader is referred to monograph of the Congress, as only a short statement of the contents is given here. On page 7-13 will be found a short account of the relation of pyrite deposits to the Caledonian mountain chain in Norway. The author maintains, that the main part of its intrusives, and with them the pyrite deposits, belong to the first period of folding processes of the Norwegian mountain chain, probably of Lower Ordovician age. On page 13-18, the characteristic features of the Norwegian pyrite deposits are described, and a summary of the recent views concerning their geology is given. According to these, a small group of pyrite deposits are bio-chemical sediments between basaltic, submarine lava beds, the greatest part of them are magmatic differentiates from gabbroidal intrusives, and a last group are hydromagmatic or hydrothermal deposits.

Borchgrevink , 1940
Rapport over Bericht uber die Besichtigung der Tagesanlagen der Undal Gruve bei Berkåk am 21. september 1940.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 849;4 pages
Abstract:
Rapporten er en befaringsrapport. Rapporten beskriver anlegget. Rapporten inneholder også forslag til forbedringer på anleggsiden. Med nåværende driftsform kan man ikke produsere mer enn 10 000 tonn pr. år.

Horvath, O.; Lorensen, E. , 1943
Geophysikalische Untersuchungen Undal bei Berkaak, SÏdtrøndelag, Norwegen.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 852;9 pages
Abstract:
Det er gjort elektromagnetiske målinger i feltet. Det framkommer to markerte elektomagnetiske indikasjoner. Det framkommer også magnetiske drag, og de sterkeste er mellom 500 - 2000 gamma. I røsk i tilknyttning til den østre indikasjonen observeres grafittskifer og spor av magnetkis. Disse markerte ledere kan ha sammenheng med grafittskifer.

Lindberg, Per Aksel , 1971
En geologisk og petrografisk undersøkelse med malmgeologiske betraktninger i området Berkåk - Soknedal, Sør-Trøndelag.
;UiO Geografisk inst.;AVHANDLING

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.:
Rui, I.J. 1969: Befaring i Undal Grube 18/2 1969. BV 1883.


Smemo, Ø. 1969: Malmletingsarbeider 1968, Undals Verk. BV 1881.


Ulseth, A. 1970: Malmletingsarbeider 1969, Bjørgåsen, Undal. BV 1882.

Fieldsamples
Sample No. Sample type Miscellanrous
ST0077.01 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Fink., py-dom. massivmalm
No. of registrated element analyses = 1
ST0077.02 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Samleprøve, massivmalm fra tipp.
No. of registrated element analyses = 1
ST0077.03 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Kvartsitt med semimassiv py-cpy-po-min.
No. of registrated element analyses = 1
ST0077.04 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Finkornet, massiv py-po-cpy-sl-malm
No. of registrated element analyses = 1
ST0077.05 Dump
Sampler: Wilberg/...Stored: Løkken
Comment: Massiv po.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 5022 - 017 Undal

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#
ST0077.01 Dump 2536 70254 1491 18 3 1.6 25.0
ST0077.02 Dump 9564 5459 163 171 15 5.4 46.0
ST0077.03 Dump 8411 978 378 159 4 4.1 36.0
ST0077.04 Dump 11257 1311 137 686 8 5.6 42.0
ST0077.05 Dump 2429 17545 329 2 66 3.4 2.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
ST0077.01 3.0 1.0 91 163.0 -1 13.00 -3 9 45.20
ST0077.02 1.0 -1.0 87 18.1 -1 1.00 -3 15 34.70
ST0077.03 -1.0 -1.0 45 2.0 14 2.00 -3 6 18.40
ST0077.04 2.0 -1.0 79 3.8 11 -1.00 -3 32 31.90
ST0077.05 -1.0 -1.0 59 57.8 4 8.00 -3 20 35.20
------------------
Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
ST0077.01 5 6 406 15.72 2.00 -8.00 8 75.0 -1.00
ST0077.02 4 5 894 26.63 5.00 -8.00 -2 58.0 -1.00
ST0077.03 -1 14 146 15.82 3.00 -8.00 10 5.0 -1.00
ST0077.04 6 3 2129 35.46 5.00 -8.00 -2 34.0 -1.00
ST0077.05 4 -1 274 50.77 7.00 -8.00 -2 21.0 -1.00
------------------
Sample No. B*
ST0077.01 -3
ST0077.02 -3
ST0077.03 -3
ST0077.04 -3
ST0077.05 -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