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THE ORE DATABASE
Occurence 5026 - 033 Rødhammer
(Object Id: 4434)
(Last updated: 14.03.2024)
Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 622618 m. North: 6981171 m.
Longitude: 11.4162220 Latitude: 62.9396830
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis Cu Zn
Importance
Raw material meaning: Little Importance (reg. 27.05.2015)

Resources and production
Activity: Test mining Reserves: 900 thousand tons
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Cu 0.5 % 27.05.2015
S 36 % 27.05.2015

Operations
From - To Activity Comments
1777 - 1780 Test mining
1791 Test mining Company/Institution :Røros Kobberverk
1818 Test mining Company/Institution :Røros Kobberverk
1824 Test mining Company/Institution :Tydals Verk
1907 Pitting
1917 Core drilling
1954 - 1956 Core drilling
1971 Geology Company/Institution :University of Oslo (O. Nilsen)

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

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

Lithology:
Relationship Rock Origin
Wall rock Porfyrisk metadoleritt Intrusive
Original rock :Dolerite
Wall rock Amfibolitt Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite

Information(s) in free text format
Free text
From Nilsen, 1971: The deposit lies within metavolcanics (amphibolite and minor felsic metavolcanics) near the southern tips of a wedge of sillimanite-bearing biotite schists. The rocks are intensely folded, and the metamorphic grade is high, as the result of contact metamorphism due to the Hyllingen gabbro complex. The deposit consists of an upper pyritic ore body associated with metavolcanics and a lower, more copper-rich ore body associated with gedrite-rich schist. The pyrite body is a regular, elongated plate/lens with an average thickness of 3.5 m and can be traced 300 m in the strike direction (N-S, dip 60-80 degr. E). In addition to pyrite, pyrrhotite and chalcopyrite are accessory phases. Main gangue phases are quartz and mica. The copper content of the ore is low (0.1-0.5 %), while sulphur content is c.a 35 %. The copper-rich lower body is comprised of a network of thin, irregular layers lying within the gedrite rocks, close to the metavolcanics in the east. The ore layers and lenses show a tendency of branching, and often crosscut the main foliation. A single layer may be from a few cm to 4 m in thickness. The total thickness of the zone is ca. 20 m. The ore consists of chalcopyrite, pyrrhotite and pyrite in a medium-grained brownish-grey gedrite rock. Iron oxides occur as minor ore constituents.The ore has a higher Cu content than the upper body (0.5-1.5 %) and lower sulphur content (20-30 %).

Bibliography:
From NGU's Reference Archive:
Nilsen, Odd , 1971
Sulphide mineralization and wall rock alteration at Rødhammeren mine, Sør-Trøndelag, Norway.
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.51 (3);329-354 pages
Abstract:
The present paper deals with the geological setting and the petrology of the wall rocks and ores at Rødhammeren pyrite deposits, Haltdalen, Sør-Trøndelag. The sulphide mineralization has taken place in the southern part of a narrow zone of sillimanite-bearing biotite schists, near the border of enclosing metavolcanics (amphibolites and quartz keratophyres). There are two principal ore bodies: a lens-shaped upper pyrite body and a lower, irregular and veined pyrrhotite-chalcopyrite body. The wall rocks are affected by a Mg metasomatism which has transformed the biotite schists into cordierite-bearing anthophyllite-gedrite rocks and the quartz keratophyres into cordierite quartzites. An epigenetic origin is suggested and the deposit is classified as being of the "Falu type".

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.

Fieldsamples
Sample No. Sample type Miscellanrous
ST0232.TGST93.053 Dump
Sampler: Grenne, T.
Comment: TGST93.053 Magnetkis-kobberkisdisseminasjon i hornblenderik b.a., tipp ved sydlige sjakt

Name of Sample point: Prøvepunkt 1
(Object Id: 6732 33,00,01)
Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 622634 m. North: 6981347 m.
Longitude: 11.4166500 Latitude: 62.9412510
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis Cu Zn


Fieldsamples
Sample No. Sample type Miscellanrous
ST0232.01 Bedrock
Sampler: Grenne, T.
Comment: TGST93.047 Gjennomsnitt semimassiv-tett diss. po+cp+/-py malm, nordligste tipp
ST0232.02 Bedrock
Sampler: Grenne, T.
Comment: TGST93.048 Gjennomsnitt massiv py-malm, nordligste tipp
ST0232.03 Dump
Sampler: Grenne, T.
Comment: TGST93.049 Massivmalm, nordligste tipp
ST0232.04 Dump
Sampler: Grenne, T.
Comment: TGST93.050 Massivmalm, nordligste tipp

Name of Sample point: Prøvepunkt 2
(Object Id: 6733 33,00,02)
Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 622419 m. North: 6981092 m.
Longitude: 11.4122280 Latitude: 62.9390380
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


Fieldsamples
Sample No. Sample type Miscellanrous
ST0232.05 Bedrock
Sampler: Grenne, T.
Comment: TGST93.051 Omvandlingsbergart med gulrød forvitringshud
ST0232.06 Bedrock
Sampler: Grenne, T.
Comment: TGST93.052 Omvandlingsbergart med rød forvitringshud

Name of Sample point: Prøvepunkt 3
(Object Id: 6734 33,00,03)
Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 622569 m. North: 6981192 m.
Longitude: 11.4152550 Latitude: 62.9398850
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


Fieldsamples
Sample No. Sample type Miscellanrous
ST0232.08 Bedrock
Sampler: Grenne, T.
Comment: TGST93.054 Lys bergart øst for malmsonen
ST0232.09 Bedrock
Sampler: Grenne, T.
Comment: TGST93.055 Lys bergart øst for malmsonen

Name of Locality: Trælsåfjell
(Object Id: 10035 33,01,00)
Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 621709 m. North: 6980980 m.
Longitude: 11.3981820 Latitude: 62.9382730
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Operations
From - To Activity Comments
1997 - 1997 Sampling Company/Institution :NGU

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Plagioclase Major mineral (>10%)
Gangue mineral Muscovite Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Metarhyodacite Extrusive
Original rock :Rhyodacite
Metamorphic facies :Greenschist
Wall rock Porphyritic metadolerite Intrusive
Original rock :Dolerite
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Schistosity Strike/Dip :4 / 90 Post-mineralisation ;...Effect :Modifies

Photo(s) from the Deposit area:
Photo no. 1 showing Trælsåfjell skjerp"

Fieldsamples
Sample No. Sample type Miscellanrous
JS97006 Dump
Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2
Comment: po diss.i svært fink aggregater (leopardtekstur) i hvit, sterkt forvitret bergart (keratofyr?).
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Trælsåfjell
(Object Id: 10036 33,01,01)
Location
County: Trøndelag Municipality: Holtålen (5026)
Map 1:50000: Ålen (1720-4) Map 1:250000: Røros
Coordinate system: EU89-UTM Zone 32
East: 621754 m. North: 6980827 m.
Longitude: 11.3989590 Latitude: 62.9368810
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis


Fieldsamples
Sample No. Sample type Miscellanrous
JS97005 Bedrock
Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2
Comment: po diss. og py striper i svartskifer
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 5026 - 033 Rødhammer

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#
JS97005 Bedrock 675 234 124 268 152 2.1 62.0
JS97006 Dump 80 27 8 33 51 .3 8.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
JS97005 22.0 69.0 94 1.8 19 17.00 6 -3 10.02
JS97006 6.0 8.0 7 .6 2 5.00 3 -3 3.14
------------------
Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
JS97005 84 27 1054 18.06 7.00 10.00 -2 13.0 19.00
JS97006 40 50 79 4.92 -2.00 -8.00 -2 1.0 -1.00
------------------
Sample No. B*
JS97005 -3
JS97006 -3

The fact sheet was created on 25.04.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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