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THE ORE DATABASE
Deposit 5026 - 029 Kjøli
(Object Id: 4422)
(Last updated: 19.03.2024)

Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 633674 m. North: 6973437 m.
Longitude: 11.6275860 Latitude: 62.8664430
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Kis
Importance
Raw material meaning: Little Importance (reg. 27.05.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production: 250 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Cu 2.35 % 25.05.1998
S 45.9 % 27.05.2015
Zn 0.17 % 27.05.2015

Operations
From - To Activity Comments
1766 - 1769 Test mining Company/Institution :Selbo kobberverk/Røros kobberverk
1773 - 1798 Regular production Company/Institution :Selbo kobberverk
1857 - 1868 Regular production Company/Institution :Tydals verk
1895 - 1897 Regular production Company/Institution :A Huitfeldt & Co
1897 - 1899 Regular production Company/Institution :The Cape Copper Company Ltd.
1899 - 1903 Regular production Company/Institution :A. Huitfeldt & Co
1903 - 1907 Regular production Company/Institution :Kjøli Mines Ltd.
1910 - 1914 Regular production Company/Institution :Verstrate & Fils
1915 - 1919 Regular production Company/Institution :A. Huitfeldt & Co
1930 - 1941 Regular production Company/Institution :Kommunal drift

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form: Plate
Main texture: Structureless Min. distribution: Massive (>50 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration: Chloritisation
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Røros Nappe Complex
Tectonic complex:
Igneous complex:
Group: Aursund Formation: Røsjø

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Chlorite Major mineral (>10%)
Gangue mineral Muscovite Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Chalcopyrite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Sphalerite Subordinate mineral (1-10%)
Ore mineral Magnetite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Wall rock Greyish meta-arenite Sedimentary
Original rock :Greywacke
Metamorphic facies :Greenschist
Wall rock Chlorite-muscovite schist Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :165 / 20 Post-mineralisation ;...Effect :None

Information(s) in free text format
Free text
The Kjøli deposit produced c. 250 000 t of ore with 1.9-2.4 % Cu, 0.02-0.2 % Zn, 45.9-46.8 % S during discontinuous production from 1773 to 1941. Other similar but much smaller deposits in the Kjøli area, including Midtgruben, Godthåb, Røros Menna and Svensk Menna, produced altogether only 15-20 000 t of copper ore. The deposits are hosted by banded meta-argillites and more massive metagreywackes, which contain thin layers of volcaniclastic sediments. The sulphide bodies are chiefly composed of massive pyrite and/or pyrrhotite with variable contents of chalcopyrite and sphalerite. Disseminated or layers of massive magnetite are quite commonly associated with the sulphides. The massive sulphides often occur as thin, extensive sheets, locally as irregular, small lenses which rarely exceed one metre in thickness. The sulphide bodies are typically surrounded by haloes of chlorite-rich schists, attributed to wallrock alteration.

Photo(s) from the Deposit area:
Photo no. 1 showing Informasjonsplakat ved Kjøli"
Photo no. 2 showing Kjøli-feltet"

Bibliography:
From NGU's Reference Archive:
Aasgaard, Gunnar , 1927
Gruber og skjerp i kisdraget Øvre Guldal-Tydal.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.129;1-196 pages
Abstract:
The occurences described in this paper form a connection between th mining districts around Røros to the south and those around Meråker to the north. The occurences lie in mountain regions partly above the forest line. The list on page 12 contains the names of all known occurrences of whatever size within the district considered. Pl. I is a geological outline map of the district, compiled from maps in the Norwegian Geological Survey. In a geological summary on pages 18-27 it is shown that no pyrite occurrences of economic importance so far have been found in an eastern zone along the Swedish boundary where the rocks consist of hard schist with sparagmites, and igneous rocks. Neither have such occurrences been found in a zone of "Stuedalsskifer" and an other zone of "Gulaskifer" towards west, both indicated on the map. The occurrences of pyrite are chiefly found in connection with fine grained, light green or gravish, partly feldspar bearing schist and in connection with green schists, mostly fine grained hornblende schists. All these zones of schist gnereally strike north and dip west. The pyrite bearing schist lie on both sildes of a large zone of igneous rocks extending from Kjølifjell in the south over Hyllingen and Melshogna to Fangen in the Meråker district in the north.

Bakke, Inge , 1972
Berggrunnsgeologisk undersøkelse i områdene omkring kisdraget Kjøli-Allergot, Ålem - Tydal, Sør-Trøndelag.
;UiO Geografisk inst.;AVHANDLING

Rui, Ingolf J.; Bakke, Inge , 1975
Stratabound sulphide mineralization in the Kjøli area, Røros district, Norwegian Caledonides.
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.55 (1);51-75 pages
Abstract:
Two important sulphide ore-bearing formations have been recognized in the Cambro-Silurian succession of the Røros district. One is composed of submarine greenstones and quartz keratophyres (the Hersjø Formation). The other one, which is studied here, consists of a heterogeneous series of banded meta-argillites and meta-greywackes with subordinate thin green interlayers of probable volcanogenic origin (the Røsjø Formation). These two formations are embedded in a thick succession of various clastic sedimentary rocks which have undergone metamorphism and folding during the Silurian orogeny. The numerous sulphide deposits which occur in the Kjøli area are largely confined to the Røsjø Formation. The sulphide bodies are chiefly composed of massive pyrite and/or pyrrhotite showing variable chalcopyrite and sphalerite grades. The massive sulphides often occur as thin, extensive sheets, locally as irregular, small lenses which rarely exceed one metre in thickness. It is probable that the sulphides have been precipitated primarily on the sea-floor, but there is no clear evidence of a volcanogenic origin. Local discordant relationships between the massive sulphides and the wall rocks are ascribed to metamorphic mobilization of the sulphides. The thicker sulphide lenses may themselves represent mobilized portions of thinner sulphide-rich units.

Fieldsamples
Sample No. Sample type Miscellanrous
399651 Dump
Sampler: MINDEX ASA
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Kjøli II
(Object Id: 10023 29,01,00)

Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 633974 m. North: 6973707 m.
Longitude: 11.6336920 Latitude: 62.8687540
Show on map

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

Photo(s) from the Deposit area:
Photo no. 1 showing Kjøli II, tppene"

Fieldsamples
Sample No. Sample type Miscellanrous
ST0220.01 Dump
Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2
Comment: py-cpy malm, massiv, finkornet, noe kvarts i matriks.
No. of registrated element analyses = 1
ST0220.02 Dump
Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2
Comment: py malm, massiv, finkornet, middelskornete py- blaster, spor av cpy, grønne fragmenter.
No. of registrated element analyses = 1
ST0220.03 Dump
Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2
Comment: py-cpy malm, massiv, fin-middelskornet.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 5026 - 029 Kjøli

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#
ST0220.01 Dump 37627 224 35 208 18 5.9 158.0
ST0220.02 Dump 20177 266 28 159 16 4.2 296.0
ST0220.03 Dump 28251 196 31 149 12 4.4 214.0
399651 Dump 28000 3722 44 86 29 5.5 356.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
ST0220.01 -1.0 -1.0 150 -.2 3 -1.00 -3 45 42.20
ST0220.02 -1.0 -1.0 88 .3 3 -1.00 -3 40 43.39
ST0220.03 3.0 1.0 86 -.2 2 -1.00 -3 37 44.63
399651 3 9.6 24 5.00 3 8
------------------
Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
ST0220.01 5 3 17 33.50 4.00 -8.00 -2 -1.0 -1.00
ST0220.02 8 6 31 32.14 3.00 -8.00 -2 1.0 -1.00
ST0220.03 5 2 7 30.76 3.00 -8.00 -2 1.0 1.00
399651 47 87 564 23.90 4.0 8.00
------------------
Sample No. B* Ti*
ST0220.01 -3
ST0220.02 -3
ST0220.03 -3
399651 899


The fact sheet was created on 29.03.2024

Questions or comments regarding the fact sheet can be emailed to:
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