Norsk versjon
	THE ORE DATABASE
	Occurence 4020 - 004 Kringsås
	(Object Id: 5415) (Last updated: 28.03.2020)

Products

	Element/product	Crude ore grade or quality	Reg. date
	MoS2	5-7 %	12.12.2006

Operations

	From - To	Activity	Comments
	1896 - 1896	Test mining
	1916 - 1918	Test mining	Company/Institution :Christiania Minecompani
			Idenne perioden ble det utvunnet 3,2 tonn malm/vaskegods med 5-7 % MoS2.

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Hydrothermal vein	Form:	Lens
	Main texture:	Fracture filling	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Chloritisation

	Strike/Dip:	316 / 45	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	Calcite	Subordinate mineral (1-10%)
	Ore mineral	Molybdenite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Bornite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	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 :316 / 26	Pre-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Forekomsten ligger nord for Sauherad kirke, i bratt skogsterreng i bunnen av en brattskrent på sørvestsida av fjellet Kringsås. En traktorsti går rett ved den. Prøvedrift pågikk i årene 1896 og 1916 før Christiania Minecompani gjennomførte regulær drift i årene 1917-18. Vel 3 tonn malm med 5-7 % MoS2 skal være utvunnet i denne driftsperioden. En 12 m lang stoll med retning 50º er drevet. Ca. 8 m inn i denne er det drevet en skjæring på ca. 15 m ut i dagen mot NNV. Utgangen til denne danner en fin heller. Hovedbergarten er en finlaminert, mellomtykk benket feltspatførende kvartsitt med foliasjon 316º/26º. I stollveggen sees en 10-15 cm bred kvartsgang som skjærer foliasjonen i kvartsitten med liten vinkel. Få flak av moybdenglans og malakittfarging sees langs kanten av denne gangen. Denne mineraliseringstypen med rikere kobberglans-kobberkis-bornitt sammen med molybdenglans finnes igjen på stuffer på tippen. Kobbermineralene danner strenger og aggregater i kvartsen.

Bibliography:

From NGU's Reference Archive:

Geis, H.P. , 1966

	Molybdenundersøkelser på Sørlandet og Telemark.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 6730;86 pages

Bugge, Arne , 1963

	Norges molybdenforekomster.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.217;1-134 pages

Abstract:

The ore fields and individual deposits which are mentioned in the text are shown on the map, figure 2. For those areas where the deposits lie so close together that they cannot be shown separately on this map, detail maps have been drawn on larger scales. In the descriptions there will also be found special maps covering the most important molybdenum areas. An index of the deposits which are mentioned is arranged both alphabetically and according to the numbers on the map. The majority, including the most important, of the ore deposits in Southern Norway lie within a marked zone, which is shown on the map, figure 3. At varying periods of time different metals have characterised the long zone of ore deposits: titanium in the southwest, then molybdenum in the area from Gursli to Knaben, copper and molybdenum in Telemark, silver, zinc and lead from Kongsberg eastwards, and further to the east, molybdenum again. From the map, figure 4, it can be seen that the most important groups of deposits are situated to both sides of the granite-gneiss area of the mountanious region of Southern Norway and that they lie in migmatised gneisses along the southwest side and in the schists and quartzites of the Telemark supracrustal suite along the northeast side.

Myrland, R. , 1965

	Telemark Project. (Norsk tekst.) Registration of information on mineral occurences, prospect, old workings etc. Kringsåsgrubene.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 4371;2 pages

	Abstract:
	Rapporten er et standard registreringsskjema brukt i "Telemarkprosjektet", og beskriver kort forekomstens topografiske og geologiske plassering, forekomsttype, sidebergart, samt malm- og gangmineraler. Forekomsten er molybdenglans og mindre mengder kobberkis og bornitt i gjennomsettende kvartsganger. Malmmengder og gehalter fra driftsårene 1916-18 er tatt med i rapporten.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	TE0028.01	Dump	Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2 Comment: Aggregates/veinlets of chalcocite-bornite-chalcopyrite+? in quartz No. of registrated element analyses = 1
	TE0028.02	Dump	Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2 Comment: Molybdenite along quartz vein with dissemination of bornite+chalcopyrite No. of registrated element analyses = 1

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

Name of Locality: Kringsås NV

(Object Id: 17790 4,01,00)

Location

County:

Telemark

Municipality:

Midt-Telemark (4020)

Map 1:50000:

Nordagutu (1713-4)

Map 1:250000:

Skien

Coordinate system:

EU89-UTM Zone 32

East:

515342 m.

North:

6589102 m.

Longitude:

9.2705170

Latitude:

59.4402140

Show on map

Resource

	Resource Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Resource Subtype:	Molybdenium
			Element(s):	Mo Cu

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Calcite	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Ore mineral	Molybdenite	Major mineral (>10%)
	Ore mineral	Chalcocite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	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 :295 / 15	Pre-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Skjerpet er en 6 m lang, 1-2 m bred og opptil 4 m høy skjæring oppunder en brattskrent. Tynn til mellomtykk benket kvartsitt med en foliasjonsparallell kloritt-amfibol rik sone med små kvartslinser finnes. Den representerer en mindre skjærsone og fører disseminasjon av molybdenglans og små mengder kobberglans.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	TE0028.03	Bedrock	Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2 Comment: Dissemination of molybdenite-chalcocite in chlorite rock 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 4020 - 004 Kringsås

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#
TE0028.01	Dump	9268	30	3	7	12	13.1	134.0
TE0028.02	Dump	1076	14	-3	1	6	3.9	48.0
TE0028.03	Bedrock	45	431	-3	63	97	.5	4.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	V*
TE0028.01	-2.0	4.0	2	-.5	4	971.00	-3	39	3
TE0028.02	3.0	6.0	-2	-.5	3	2000.00	-3	11	2
TE0028.03	3.0	6.0	4	.7	763	1285.00	6	-3	205

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

Sample No.	Cr*	Mn*	Fe%	W*	Sr*	La*	B*	P*	Ca*
TE0028.01	14	149	1.16	-2	2.0	-1.00	-3	0	0
TE0028.02	10	240	.46	-2	2.0	-1.00	-3	0	1
TE0028.03	137	1472	10.25	-2	12.0	7.00	-3	0	0

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The fact sheet was created on 25.04.2024

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

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