Fact Sheet for <b>Occurence 5056

					Norsk versjon
	THE ORE DATABASE
	Occurence 5056 - 004 Grønnøya
	(Object Id: 4499) (Last updated: 01.07.2020)

Location

County:

Trøndelag

Municipality:

Hitra (5056)

Map 1:50000:

Sør-Frøya (1422-3)

Map 1:250000:

Kristiansund

Coordinate system:

EU89-UTM Zone 32

East:

470000 m.

North:

7052891 m.

Longitude:

8.3952200

Latitude:

63.6027630

Show on map

Resource

	Resource Type:	Ferrous metals(Fe, Mn, Ti)	Resource Subtype:	Iron
			Element(s):	Fe

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Mining	Reserves:	0 thousand tons
	Operating method:	Open pit mining	Historical production:

Operations

From - To Activity Comments

1907 - 1907 Test mining

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Unknown Form: Lens

Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)

Main grain size: Fine grained (< 1 mm) Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Epidote Major mineral (>10%)

Gangue mineral Garnet Subordinate mineral (1-10%)

Gangue mineral Pyroxene Subordinate mineral (1-10%)

Ore mineral Magnetite Major mineral (>10%)

Ore mineral Pyrite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock granat-pyroksen-epidot bergart

Metamorphic facies :Amphibolite

Wall rock granittisk gneis Extrusive

Metamorphic facies :Amphibolite

Wall rock amfibol gneis Extrusive

Metamorphic facies :Amphibolite

Structures

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

Host rock Foliation Strike/Dip :270 / 30 Post-mineralisation ;...Effect :None

Information(s) in free text format

Free text

På nordsida av øya ligger et relativt stort dagbrudd. Det er 60 m langt, delvis åpent mot sjøen og med en 6-7 m høy skrent i sør. Dagbruddet er i to plan. 20 m øst for dagbruddet finnes et lite dagbrudd som er kun 1-1,5 m dypt. På sørsida av øya finnes et mindre tverrslag uten at malm er påtruffet. Relativt mye malm er tatt ut, men mengden er ukjent. Sannsynligvis dels benyttet som ballast i båter i følge lokalkjente. Malmen består av fink magnetitt med lokalt litt svovelkis. Den er dels massiv, i opptil 2 m brede soner, og dels semi-massiv/disseminert i granat-pyroksen-epidot bergart. Den magnetitt-førende sonen er opptil 8 m mektig og parallell foliasjonen i gneissene. Sidebergartene er amfibolgneis og granittisk gneis som kan representere metavulkanitter.

Bibliography:

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

Kulturminner på Hitra. Hitra kulturutvalg 1975.

Fieldsamples

Sample No. Sample type Miscellanrous

ST0298.01 Bedrock

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: Magnetitt-malm, finkornet, massiv, litt epidot i matriks, fri for sulfider (2 m tverrprofil)

No. of registrated element analyses = 1

ST0298.02 Bedrock

Sampler: Sandstad, J.S./...Stored: Løkken

Comment: Granat-pyrittroksen-epidot skarn, svak pyritt disseminasjon og pyritt+magnetkis i årer (0.5 m tverrprofil)

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5056 - 004 Grønnøya

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#

ST0298.01 Bedrock 20 110 16 38 18 -.2 -1.0

ST0298.02 Bedrock 60 37 5 34 7 -.2 -1.0

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

Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*

ST0298.01 -5.0 -1.0 58 -1.0 5 -1.00 -20 6 16

ST0298.02 -5.0 -1.0 19 -1.0 -2 2.00 -20 -5 -5

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

Sample No. V* Cr* Mn* Fe% W* Sr* La* Na* Mg*

ST0298.01 42 188 959 10.00 -20 10.0 39.00 0 0

ST0298.02 35 194 5110 9.71 -20 10.0 13.00 0 0

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

Sample No. Al* K * Ca* Te*

ST0298.01 1 0 1 -10.00

ST0298.02 2 0 6 -10.00

Era:	Paleozoic	Period:	Ordovician
Genesis:	Unknown	Form:	Lens
Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Epidote	Major mineral (>10%)
Gangue mineral	Garnet	Subordinate mineral (1-10%)
Gangue mineral	Pyroxene	Subordinate mineral (1-10%)
Ore mineral	Magnetite	Major mineral (>10%)
Ore mineral	Pyrite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	granat-pyroksen-epidot bergart
		Metamorphic facies :Amphibolite
Wall rock	granittisk gneis	Extrusive
		Metamorphic facies :Amphibolite
Wall rock	amfibol gneis	Extrusive
		Metamorphic facies :Amphibolite

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :270 / 30	Post-mineralisation ;...Effect :None

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
ST0298.01	Bedrock	20	110	16	38	18	-.2	-1.0
ST0298.02	Bedrock	60	37	5	34	7	-.2	-1.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
ST0298.01	-5.0	-1.0	58	-1.0	5	-1.00	-20	6	16
ST0298.02	-5.0	-1.0	19	-1.0	-2	2.00	-20	-5	-5

Sample No.	V*	Cr*	Mn*	Fe%	W*	Sr*	La*	Na*	Mg*
ST0298.01	42	188	959	10.00	-20	10.0	39.00	0	0
ST0298.02	35	194	5110	9.71	-20	10.0	13.00	0	0