Norsk versjon
	THE ORE DATABASE
	Deposit Area 1740 - 020
	(Last updated 16.mai.2006)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest

Operations

	From - To	Activity	Comments
	1994 - 1994	Geology	Company/Institution :NGU
	1996 - 1996	Sampling	Company/Institution :NGU

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Dating:		Method:
	Genesis:	Volcex	Form:	Lens
	Main texture:	Structureless	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Pyritisation

	Strike/Dip:	260 / 70	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

	Province:	Caledonides
	Geotec.unit:	Køli Nappe Complex
	Tectonic complex:
	Igneous complex:	Skorovass Complex

Group:

Gjersvik

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Feldspar	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Biotite gneis	Extrusive Original rock :Rhyodacite
			Metamorphic facies :Amphibolite
	Host rock	Amphibolite	Extrusive Original rock :Basalt
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Schistosity	Strike/Dip :260 / 70	Post-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Mineraliseringen opptrer langs en bekk nord for Tunnsjøelva, 1km nordøst for Admiralhytta. Det er ingen tegn på skjerpeaktivitet i området, men det er mye rust og svak sulfidmineralisering som kan følges stedvis i en lengde av flere hundre meter langs bekken. Mineraliseringen opptrer i en sterkt forskifret del av en amfibolitt som også fører hyppig små kvartslinser. Den mineraliserte sonen er 2-5 m bred. Sulfidene opptrer dels disseminert og dels som korte strenger/årer. En lys biotittgneis, som kan representere en sur metavulkanitt. Svak sulfiddisseminasjon forekommer også i denne.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS96076	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Comment :Pyrite dissemination in amphibole-chlorite schist. No. of registrated element analyses = 1
	MH94-233	Bedrock	Sampler :Heim, M./...Stored :Løkken Comment :Pyrite dissemination in amphibolite. No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

Name of Sample point : Tunnsjødalpassen

(Object Id : 1740,020,00,01)

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Location

County :

Nord-Trøndelag (17)

Municipality :

Namsskogan (1740)

Map 1:50000:

Skorovatn (1824-2)

Map 1:250000:

Grong

Marking point:

Longitude:

12.9974630

Latitude:

64.7370690

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

404652 m.

Y-coord:

7180659 m.

Commodity

	Main Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Sub Type:	Sulphides
			Element(s):	Kis

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS96074	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Comment :Pyrite disseminations/veinlets in medium grained amphibolite with quartz lenses. No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

Name of Sample point : Tunnsjødalplassen

(Object Id : 1740,020,00,02)

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Location

County :

Nord-Trøndelag (17)

Municipality :

Namsskogan (1740)

Map 1:50000:

Skorovatn (1824-2)

Map 1:250000:

Grong

Marking point:

Longitude:

12.9980860

Latitude:

64.7371680

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

404682 m.

Y-coord:

7180669 m.

Commodity

	Main Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Sub Type:	Sulphides
			Element(s):	Kis

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS96075	Bedrock	Sampler :Sandstad, J.S./...Stored :Løkken Comment :Pyrite dissemination in fine grained biotite gneis (felsic metavolcanite?). 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 1740 - 020 Tunnsjødalplassen

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#
JS96074	Bedrock	325	69	-3	25	11	.3	13.0
JS96075	Bedrock	42	107	27	25	4	.4	9.0
JS96076	Bedrock	220	2233	18	38	13	.4	8.0
MH94-233	Bedrock	134	1683	16	18	18	.6	5.0

------------------

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sn*	Sb*
JS96074	-1.0	-1.0	-1.0	44	.4	8	-1.00		6
JS96075	1.0	-1.0	-1.0	-2	-.2	33	7.00		-2
JS96076	-1.0	1.0	-1.0	-2	57.1	66	-1.00		-2
MH94-233	-5.0	-1.0		27	5.5	35	9.00	-20	-5

------------------

Sample No.	Bi*	S%	V*	Cr*	Mn*	Fe%	Th*	U*	W*
JS96074	-2	6.59	40	6	194	3.94	-2.00	10.00	-2
JS96075	2	2.17	145	3	500	5.14	-2.00	6.00	-2
JS96076	-2	4.81	318	12	4097	13.67	-2.00	10.00	-2
MH94-233	7	2.50	156	175	1827	5.37			25

------------------

Sample No.	Sr*	Y*	La*	B*	Te*
JS96074	1.0		1.00	-3
JS96075	7.0		1.00	-3
JS96076	9.0		2.00	-3
MH94-233	3.0	5.0	-1.00		-10.00

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The fact sheet was created on 20.01.2025

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

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