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	THE ORE DATABASE
	Occurence 3441 - 030 Megrund
	(Object Id: 20434) (Last updated: 31.01.2024)

Mineralization

	Era:	Proterozoic	Period:	Mesoproterozoic
	Genesis:	Orthomagmatic formation	Form:	Lens
	Main texture:	Vein network	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

	Strike/Dip:	109 / 45	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	Caledonides
	Geotec.unit:	Jotun Nappe Complex
	Tectonic complex:	Espedalen Complex
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Pyroxene	Major mineral (>10%)
	Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Norite	Intrusive Original rock :Norite
			Metamorphic facies :Amphibolite
	Wall rock	Peridotite	Intrusive Original rock :Peridotite
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :109 / 45	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Sulfidmineraliseringene ved Megrund er en av de få som er kjent på vestsida av Espedalsvatnet. De finnes nord for Nedre Megrundstjern øverst i den bratte lia ned mot Espedalsvatnet. Enkleste adkomst er langs en godt merket sti opp fra Sveasetra i sør, men det går også en bratt sti opp fra Hessenget nede ved Espedalsvatnet. Det er kun gjort mindre røskingsarbeider langs denne sulfidsona, og i tillegg har Sulfidmalm (1975-76) og senere Blackstone (2005-07) utført kjerneboring i området. Sona som er blottet er 2-4 m mektig og kan følges stedvis i en lengde av 2-300 m. Den består av disseminasjon og årenettverk av magnetkis og mindre mengder kobberkis i finkornet, svakt foliert gabbro/noritt. Sulfidmalm har også beskrevet remobilisert, mere massiv malm med 1-3 % Ni i tilknytning til skjærsoner og den sonen kan følges geofysisk over lengde på 700 m området (Nixon 1976). Lengre oppe i terrenget finnes en større linse med ultramafiske bergarter.

Bibliography:

References not to be found in NGU's Reference Archive.:

Nixon, F. 1076. Status Report, Espedalen 1976. BV Report 516, 8 pp.+ maps.

Mansur, E.T., Slagstad, T., Dare, S.A.S. & Sandstad, J.S. 2023. Geology and sulphide geochemistry of the Ni-Cu-Co mineralisation of the Espedalen Complex, Norway: Constraints for the distribution of magmatic sulphides within a variably deformed anorthosite suite. Ore Geology Reviews 161.

Corfu, F., & Heim, M. 2014. Geology and U–Pb geochronology of the Espedalen Complex, southern Norway, and its position in the Caledonian nappe systems. Geological Society, London, Special Publications, 390(1), 223-239. https://doi.org/10.1144/jgs2019-010

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	Megrund-01	Bedrock	Sampler: J.S. Sandstad/...Stored: Løkken Comment: Pyrrhotite+chalcopyrite, net-textured/disseminated, fine-grained gabbro No. of registrated element analyses = 1
	Megrund-02	Bedrock	Sampler: J.S. Sandstad/...Stored: Løkken Comment: Pyrrhotite+chalcopyrite, disseminated, medium-grained gabbro No. of registrated element analyses = 1

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

Name of Locality: Megrund nord

(Object Id: 39265 30,01,00)

Location

County:

Innlandet

Municipality:

Gausdal (3441)

Map 1:50000:

Espedalen (1717-4)

Map 1:250000:

Lillehammer

Coordinate system:

EU89-UTM Zone 32

East:

528662 m.

North:

6807303 m.

Longitude:

9.5366780

Latitude:

61.3985960

Show on map

Resource

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

Resources and production

	Activity:	Exploration	Reserves:
	Operating method:		Historical production:

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :130 / 90	Post-mineralisation ;...Effect :Modifies

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Analyse Results

from

Deposit Area 3441 - 030 Megrund

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#
Megrund-01	Bedrock	7680	76	6	439	12650	2.1	43.0
Megrund-02	Bedrock	1725	80	3	165	3230	.5	72.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
Megrund-01	42.0	48.0	0	.4	210	1.02	0	0	0
Megrund-02	51.0	24.0	-0	.3	100	0.50	0	0	0

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Sample No.	Se*	Ga*	Ge*	In*	S%	V*	Cr*	Mn*	Fe%
Megrund-01	17.00	15.15	0.25	0.07	7.86	96	94	723	11.65
Megrund-02	4.00	8.40	0.15	0.07	1.76	180	1735	1440	10.10

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Sample No.	Th*	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Cs*
Megrund-01	0.04	-0.10	-0	0.6	482.0	6.9	2	2.70	0.19
Megrund-02	0.11	-0.10	-0	5.5	76.0	5.6	13	0.30	0.25

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Sample No.	La*	Ce*	Li*	Be*	P*	Sc*	Ti*	Te*	Hf*
Megrund-01	9.60	20.70	2	1	740	12.00	3220	0.80	0.10
Megrund-02	1.20	2.89	3	0	110	34.30	2210	0.46	0.50

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

Sample No.	Re*	Tl*
Megrund-01	0	0
Megrund-02	0	0

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The fact sheet was created on 06.11.2025

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

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