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	THE ORE DATABASE
	Deposit Area 437 - 054
	(Last updated 16.mar.2017)

Importance

Public:

Not Assessed (reg. 20.04.2015)

Economical:

Could be significant

Products

	Element/product	Crude ore grade or quality
	CU
	KIS
	ZN

Operations

	From - To	Activity	Comments
		Pitting
	1986 - 1988	Geology	Company/Institution :Terje Bjerkgård, University of Oslo
	1987 - 1987	Detail mapping	Company/Institution :Terje Bjerkgård, University of Oslo
	1998 - 1998	Sampling	Company/Institution :NGU

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Dating:		Method:
	Genesis:	Volcex	Form:	Layer
	Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Chloritisation

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

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

Group:

Fundsjø Group

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Amphibole	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Gangue mineral	Sericite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Marcasite	Accessory mineral (<1%)
	Ore mineral	Covellite	Accessory mineral (<1%)
	Ore mineral	Molybdenite	Accessory mineral (<1%)
	Ore mineral	Galena	Accessory mineral (<1%)
	Ore mineral	Pyrrhotite	Accessory mineral (<1%)
	Ore mineral	Gold	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Chlorite schist	Sedimentary Original rock :Tuffite
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :40 / 56	Post-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Description (from Bjerkgård 1989): The Vardtjønn area is the southernmost and in extent the largest of the mineralized area in the Vingelen District (the others being Vingelen Mine and Nonsvola area). The lithologies in the area comprises felsic metavolcanites of both volcanic and volcanoclastic origin. A number of small post-tectonic trondhjemite bodies and lenses of graphite schist is common. In the west of the area is a larger body of metagabbro. There are eight smaller showings in the area, of which five is associated with a major alteration zone of quartz-sericite schist. This zone has a length of at least 1.2 km and a width of up to 130 m. The Nedre Vardtjønnbekken showing is situated in a thick unit of banded, tuffitic greenschist to the southeast of the unit of felsic metavolcanics. A small hole marks the working, but is without any exposures. The mineralization is however exposed in the creek, where a 70 cm thick zone is found in the greenschist. The zone consists of a 20 cm massive, finegrained and banded pyrite-sphalerite ore, with disseminated pyrite in quartz in the hangingwall and disseminated, fine grained pyrite and sphalerite (c. 40 % sulfides) in chlorite-quartz schist in the footwall followed by chlorite-sericite schist with mainly pyrrhotite further down. Sphalerite and pyrite are the main sulfides, while chalcopyrite is subordinate, typically associated with the pyrite-rich bands. Pyrrhotite, gold, covellite, molybdenite and marcasite is accessory phases in the massive zone, while pyrrhotite, molybdenite and galena is accessories in the richer disseminated zone. Non-sulfides in the massive ore is quartz, chlorite and clinoamphibole. Two analyses of the massive ore yielded 0.5, 1.3 % Cu, 1.5,9.1 % Zn, 0.1-0.3 % Pb, 26, 27 ppm Ag and 9.6, 11.0 ppm Au.

Bibliography:

From NGU's Reference Archive:

Bjerkgård, Terje , 1989

	Regionalgeologiske undersøkelser i Vingelenfeltet, Nord-Østerdalen, i det sørlige Trondheimsfeltet, med henblikk på sulfidmineraliseringene.

;UiO Geologisk fellesråd;AVHANDLING

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HE0083.01	Bedrock	Sampler :T. Bjerkgård/...Stored :Løkken/...Size(kg) :3 Comment :Massive pyrite with some chalcopyrite and lesser sphalerite. Sample from upper 5 cm of massive ore zone. No. of registrated element analyses = 1
	HE0083.02	Bedrock	Sampler :T. Bjerkgård/...Stored :Løkken/...Size(kg) :3 Comment :Massive pyrite-sphalerite and lesser chalcopyrite. Sample from lower 7 cm of massive ore zone. 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 437 - 054 Nedre Vardtjønnbekken

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#
HE0083.01	Bedrock	13015	14526	630	20	26	27.4	10980.0
HE0083.02	Bedrock	4807	90968	3086	4	21	25.7	9586.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	V*
HE0083.01	4.0	7.0	92	34.6	2	1.00	-3	-3	11
HE0083.02	-1.0	-1.0	94	176.4	2	18.00	6	11	20

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Sample No.	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*	B*
HE0083.01	1	115	34.84	3.00	-8.00	-2	3.0	-1.00	31
HE0083.02	-1	319	34.68	3.00	-8.00	-2	2.0	-1.00	35

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The fact sheet was created on 03.12.2023

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