English version
	MALMDATABASEN
	Forekomstområde 1644 - 033
	(Sist oppdatert 14.mar.2024)

Betydning

Offentlig:

Little Importance (reg. 27.05.2015)

Economical:

Lite viktig , (Confirmed 27.mai.2015 by Terje Bjerkgård)

Products

	Element/product	Crude ore grade or quality
	CU	0.5 %
	S	36 %

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
	Dating:		Method:
	Genesis:	Vulkeks	Form:	Lag
	Main texture:	Strukturløs	Min. distribution:	Massiv

Main grain size:

Middelskornet (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

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. Kommentar :TGST93.053 Magnetkis-kobberkisdisseminasjon i hornblenderik b.a., tipp ved sydlige sjakt

Navn på sample point : Prøvepunkt 1

(Objekt Id : 1644,033,00,01)

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Lokalisering

Fylke :

Sør-Trøndelag (16)

Kommune :

Holtålen (1644)

Kart 1:50000:

Ålen (1720-4)

Kart 1:250000:

Røros

Markeringspunkt:

Lengdegrad:

11.4166500

Breddegrad:

62.9412510

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-koord:

622634 m.

Y-koord:

6981347 m.

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Kis Cu Zn

Fieldsamples

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

Navn på sample point : Prøvepunkt 2

(Objekt Id : 1644,033,00,02)

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Lokalisering

Fylke :

Sør-Trøndelag (16)

Kommune :

Holtålen (1644)

Kart 1:50000:

Ålen (1720-4)

Kart 1:250000:

Røros

Markeringspunkt:

Lengdegrad:

11.4122280

Breddegrad:

62.9390380

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-koord:

622419 m.

Y-koord:

6981092 m.

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Kis Cu Zn

Fieldsamples

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

Navn på sample point : Prøvepunkt 3

(Objekt Id : 1644,033,00,03)

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Lokalisering

Fylke :

Sør-Trøndelag (16)

Kommune :

Holtålen (1644)

Kart 1:50000:

Ålen (1720-4)

Kart 1:250000:

Røros

Markeringspunkt:

Lengdegrad:

11.4152550

Breddegrad:

62.9398850

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-koord:

622569 m.

Y-koord:

6981192 m.

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Kis Cu Zn

Fieldsamples

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

Navn på locality : Trælsåfjell

(Objekt Id : 1644,033,01,00)

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Lokalisering

Fylke :

Sør-Trøndelag (16)

Kommune :

Holtålen (1644)

Kart 1:50000:

Ålen (1720-4)

Kart 1:250000:

Røros

Markeringspunkt:

Lengdegrad:

11.3981820

Breddegrad:

62.9382730

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-koord:

621709 m.

Y-koord:

6980980 m.

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Kis

Production

	Activity:	Røsking	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:

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

Bilde(r) fra forekomstområdet:

Photo no. 1 showing Trælsåfjell skjerp"

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS97006	Dump	Sampler :Sandstad, J.S./...Stored :Løkken/...Size(kg) :2 Kommentar :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.:

Navn på sample point : Trælsåfjell

(Objekt Id : 1644,033,01,01)

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Lokalisering

Fylke :

Sør-Trøndelag (16)

Kommune :

Holtålen (1644)

Kart 1:50000:

Ålen (1720-4)

Kart 1:250000:

Røros

Markeringspunkt:

Lengdegrad:

11.3989590

Breddegrad:

62.9368810

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-koord:

621754 m.

Y-koord:

6980827 m.

Materialtype

	Hovedtype:	Basemetaller (Cu,Zn,Pb,Fe sulfider,As,Sb,Bi,Sn)	Subtype:	Kobber
			Element(s):	Kis

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS97005	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken/...Size(kg) :2 Kommentar :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.:

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Analyse Results

from

Forekomstområde 1644 - 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

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Faktaarket ble generert 13.06.2026

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no

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