Fact Sheet for Deposit Area 522

					Norsk versjon
	THE ORE DATABASE
	Deposit Area 522 - 030
	(Last updated 31.jan.2024)

Name of Deposit Area : Megrund

(Object Id : 0522,030,00,00)

Location

County :

Oppland (05)

Municipality :

Gausdal (0522)

Map 1:50000:

Espedalen (1717-4)

Map 1:250000:

Lillehammer

Marking point:

Longitude:

9.5371790

Latitude:

61.3983520

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

528689 m.

Y-coord:

6807276 m.

Commodity

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

Production

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

Importance

Public: Not Assessed (reg. 20.03.2017)

Economical: Could be significant , (Confirmed 18.jan.2010 by Rolf Lynum)

Mineralization

Era: Proterozoic Period: Mesoproterozoic

Dating: Method:

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 : 0522,030,01,00)

Location

County : Oppland (05) Municipality : Gausdal (0522)

Map 1:50000: Espedalen (1717-4) Map 1:250000: Lillehammer

Marking point: Longitude: 9.5366780 Latitude: 61.3985960

EU89-UTM Zone 32 (Coordinates IS confirmed)

X-coord: 528662 m. Y-coord: 6807303 m.

Commodity

Main Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Sub Type: Nickel

Element(s): Ni Cu Co

Production

Activity: Exploration Reserves:

Prod. method: Production:

Prod. status: Volume of dump:

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Host rock Foliation Strike/Dip :130 / 90 Post-mineralisation ;...Effect :Modifies

Analyse Results

from

Deposit Area 522 - 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

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

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

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

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

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

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

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

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

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

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

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%)

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

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

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

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

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

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

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