Norsk versjon
	THE ORE DATABASE
	Deposit Area 807 - 006
	(Last updated 28.mar.2020)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest , (Confirmed 22.nov.2006 by Jan Sverre Sandstad)

Operations

	From - To	Activity	Comments
	1905 - 1905	Test mining
	2005 - 2005	Sampling	Company/Institution :NGU

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:		Method:
	Genesis:	Shear zone formation	Form:	Lens
	Main texture:	Fracture filling	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Epidotisation

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	South Norwegian Basement Province
	Geotec.unit:	Telemark Supergroup
	Tectonic complex:
	Igneous complex:

Group:

Heddal Group

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Epidote	Major mineral (>10%)
	Gangue mineral	Microcline	Subordinate mineral (1-10%)
	Gangue mineral	Fluorspar	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Ore mineral	Chalcocite	Major mineral (>10%)
	Ore mineral	Sphalerite	Major mineral (>10%)
	Ore mineral	Bornite	Major mineral (>10%)
	Ore mineral	Hematite	Subordinate mineral (1-10%)
	Ore mineral	Galena	Subordinate mineral (1-10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)
	Ore mineral	Carrollite	Accessory mineral (<1%)
	Ore mineral	Hessite	Accessory mineral (<1%)
	Ore mineral	Digenite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Amphibolite	Intrusive Original rock :Dolerite
			Metamorphic facies :Amphibolite
	Wall rock	Quartzite	Sedimentary Original rock :Quartz sandstone
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :350 / 85	Pre-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Forekomsten ligger i brattskråning vest for fylkesveien mellom Gransherad og Rjukan. Mindre forsøksdrift foregikk i 1906. En mindre dagstrosse fører inn til en liten, vannfylt skråsynk med vegger på 4x2 m, i bunnen av en brattskrent. I dagstrossa finnes kvartsittisk bergart med små kvartsganger. Omkring synken dominerer amfibolitt med feltspatårer. Malmmineraliseringene ser ut til å følge en Ø-V orientert sprekkesone med steilt fall mot nord. De består av anrikning av finkornet magnetitt i grønn epidotrik bergart. Anrikning av sinkblende, blyglans og flusspat? finnes også i denne (prøve TE0013.02). Lokalt opptrer kobberglans+bornitt i uregelmessige epidot-førende kvartslinser i tilknytning til denne knusningssona. Forekomsten har svært liten utstrekning og har ingen økonomisk interesse.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	TE0013.01	Dump	Sampler :J.S. Sandstad/...Stored :L¿kken/...Size(kg) :2 Comment :Chalcocite+bornite veinlets in quartz+epidote No. of registrated element analyses = 1
	TE0013.02	Dump	Sampler :J.S. Sandstad/...Stored :L¿kken/...Size(kg) :2 Comment :Magnetite+fluorspar? in green rock No. of registrated element analyses = 1

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

Name of Locality : Hegna

(Object Id : 0807,006,01,00)

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Location

County :

Telemark (08)

Municipality :

Notodden (0807)

Map 1:50000:

Gransherad (1614-2)

Map 1:250000:

Skien

Marking point:

Longitude:

9.0156490

Latitude:

59.7296260

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

500879 m.

Y-coord:

6621300 m.

Commodity

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

Production

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

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Epidote	Subordinate mineral (1-10%)
	Ore mineral	Chalcocite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Quartzite	Sedimentary Original rock :Quartz sandstone
			Metamorphic facies :Amphibolite
	Wall rock	Amphibolite	Intrusive Original rock :Dolerite
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :344 / 65	Syn-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Et lite skjerp med vegger på 1x1 m og 1 m høy kant i NØ. En kvartsgang/-linse finnes langs kontakten mellom kvartsitt i NØ og middelskornet amfibolitt i SV. Kun spor av kobberglans finnes i tynne, uregelmessige epidotårer i kvartsen som er melkehvit og middelskornet.

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Analyse Results

from

Deposit Area 807 - 006 Sponbekkdal

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#
TE0013.01	Dump	10000	882	324	5	12	78.4	33.0
TE0013.02	Dump	9038	10000	7633	72	50	50.2	33.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	V*
TE0013.01	2.0	6.0	-2	10.7	6	1.00	-3	19	14
TE0013.02	-2.0	3.0	12	177.9	319	-1.00	8	33	169

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Sample No.	Cr*	Mn*	Fe%	W*	Sr*	La*	B*	P*	Ca*
TE0013.01	16	499	1.12	-2	5.0	-1.00	-3	0	0
TE0013.02	26	2177	9.64	-2	66.0	7.00	13	0	1

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The fact sheet was created on 15.05.2024

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

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