Norsk versjon
	THE ORE DATABASE
	Occurence 3427 - 041 Svartsjøen
	(Object Id: 6459) (Last updated: 03.04.2002)

Operations

	From - To	Activity	Comments
	1998 - 1998	Sampling	Company/Institution :NGU

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Volcex	Form:	Lens
	Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Muscovitisation

	Strike/Dip:	300 / 25	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:	Gula Nappe
	Igneous complex:

Group:

Gula

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Garnet	Subordinate mineral (1-10%)
	Gangue mineral	Mica	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Chalcopyrite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Quartz mica schist	Sedimentary Original rock :Greywacke
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :300 / 25	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Forekomsten ligger 250 m nord for veien i tett bjørkeskog, men den er lett å finne da det går en sti på østsida av Russu opp mot skjerpet. En 4 x 4 m grunn grop er utsprengt i en skråning med 2.5 m høy vegg i nordøst. Nedenfor gropa er en 70 m3 stor tipp med relativt grove blokker. Malmen er totalt minst 2.5 m mektig og er delt av en 10-40 cm bred kvarts-muskovittskifer linse på midten som også er blottet ved sørenden av skjerpet. Området omkring er fullstendig overdekket, men svære blokker av kvarts-glimmer skifer indikerer at denne ligger over malmsona. Båndet, semi-massiv magnetkismalm med varierende mengde pyritt og magnetitt i kvartsrik grunnmasse dominerer på tippen (prøve .02). I tillegg finnes magnetitt- (prøve .01) og pyrittrike (prøve .03) varianter, men basemetallinnholdet er lavt selv om enkelte kobberkiskorn er observert.

Photo(s) from the Deposit area:

Photo no. 1 showing Svartsjøen skjerp"

Bibliography:

From NGU's Reference Archive:

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.

Berg, P. J. , 1917

	Sæterfjeldets kisfelt.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1772;1 pages

	Abstract:
	Rapporten beskriver følgende forekomster: - Sæterfjellets kisfelt som opptrer som en rekke ganger med stor regelmessighet og med mektigheter fra en til ti meter. Malmmineraliseringen er kobberholdig svovelkis. - Sandfjellets kisfelt, forekomstene er lite undersøkt. - Løken, Estermoen og Orkelbogen er et ca 10 km langt felt med betydelige mektigheter.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HE0145.01	Dump	Sampler: J.S. Sandstad/...Stored: Løkken Comment: Semi-massiv, finkornet magnetitt+magnetkis malm med kvarts+granat rik matriks No. of registrated element analyses = 1
	HE0145.02	Dump	Sampler: J.S. Sandstad/...Stored: Løkken Comment: Semi-massiv, båndet magnetkis+pyritt+magnetitt+kobberkis i kvartsrik matriks No. of registrated element analyses = 1
	HE0145.03	Dump	Sampler: J.S. Sandstad/...Stored: Løkken Comment: Semi-massiv pyritt+magnetkis+kobberkis+sinkblende+magnetitt, pyritt-rik 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

Deposit Area 3427 - 041 Svartsjøen

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#
HE0145.01	Dump	204	449	14	16	38	.2	4.0
HE0145.02	Dump	696	777	23	4	80	.2	19.0
HE0145.03	Dump	467	126	42	414	149	.5	123.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
HE0145.01	3.0	3.0	12	.1	71	1.00	13	2	2.05
HE0145.02	3.0	5.0	17	1.3	25	2.00	11	2	7.99
HE0145.03	51.0	5.0	19	.1	32	36.00	15	2	18.50

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Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
HE0145.01	249	75	1516	23.25	1.00	4.00	1	45.0	18.00
HE0145.02	352	60	1283	28.94	1.00	4.00	1	69.0	11.00
HE0145.03	75	26	766	32.63	1.00	4.00	2	37.0	9.00

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Sample No.	B*
HE0145.01	2
HE0145.02	2
HE0145.03	2

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The fact sheet was created on 08.05.2024

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

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