Fact Sheet for <b>Occurence 0

					Norsk versjon
	THE ???? DATABASE
	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 04.07.2023)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Stjørdal (1621-1)

Map 1:250000:

Trondheim

County:

UTM-Zone 33 - EUREF89/WGS84

Resource

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

Importance

Raw material meaning:

(No data)

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Volcex Form: Layer

Main texture: Banded Min. distribution: Massive (>50 % ore minerals)

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

Strike/Dip: 15 / 65 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Trondheim Nappe Complex

Tectonic complex: Gula Complex

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Ore mineral Magnetite Major mineral (>10%)

Ore mineral Hematite Major mineral (>10%)

Ore mineral Pyrite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock Banded quartzite Sedimentary
Original rock :Exhalite

Metamorphic facies :Greenschist

Structures

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

Host rock Foliation Strike/Dip :15 / 65 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Forekomsten ligger på en skogkledd kolle rett øst for Amdalsveien. Den består av en ca. 20 m lang, 3-4 m bred dagskjæring med en 8 m lang vannfylt synk. Vertsbergarten er en finkornet, magnetittførende, båndet kvartsitt som gjennomskjæres av kvartsårer med dels svak disseminasjon av pyritt. Sonen med jernmalm er 2-3 m mektig og består av både båndet hematitt-kvarts med noe magnetitt og kvartssliret magnetitt med noe hematitt. Analyser av prøver fra den store tippen i skråningen nedenfor gir opptil 33 % Fe2O3. På toppen av åsen finnes massiv, lys grønn grønnstein mens fyllittiske bergarter finnes i veiskjæringene.

Bibliography:

From NGU's Reference Archive:

Torske, Tore , 1965

Geology of the Mostadmarka and Selbustrand area, Trøndelag.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.232;1-83 + ka pages

Abstract:

The bedrock of the area consists of metamorphic epiclastic, volcanic, and intrusive rocks of assumed Lower Ordovician age, assigned to, and lithologically matching the rocks of, the Røros, Støren and Lower Hovin Groups of the Trondheim Region. A detailed petrographic description of the rock varieties is given. The metamorphic grade of all rocks corresponds to the Greenschist Facies. - Small ore deposits occur in connection with the volcanic rocks. They comprise pyrite-pyrrhotite ores of the Leksdal Type, mixed pyrite-magnetite ores, and iron oxide ores. - Lithological variations of the sedimentary rocks is tentatively correlated with events during the early periods of the Caledonian Orogeny. - The volcanism within the area seems to have started with a phase of explosive activity, followed by extrusion (mostly submarine) of copious amounts of spilitic lavas; towards the end of the main period of volcanism a new episode of explosive activity has produced what is called the upper pyroclastic horizon, comprising rocks ranging from coarse volcanic breccia to finegrained tuffs. - The intrusive rocks consist mainly of saussurite gabbros and quartz keratophyres. The latter are thought to be intrusive rather than effusive, and evidence is offered to support this. In some places the character of pyroclastic material points to a quartz keratophyre parentage. Thus, quartz keratophyres may have occurred both as intrusive and volcanic rocks.

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

Bakmark, N. & Rø, G 2014, Jerngruver, natur- og kulturminner i nærheten av Mostadmark jernverk - TURBOK. Mostadmark Jernverks Venner, 144 s.

Fieldsamples

Sample No. Sample type Miscellanrous

Blomdalen 1 Dump

Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2

Comment: Banded hematite-quartz, some magnetite

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Blomdalen 2 Dump

Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2

Comment: Quartz-lenses in magnetite ore, some hematite

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Blomdalen 3 Dump

Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2

Comment: Quartz-magnetite with quartz-pyrite veinlets

No. of registrated element analyses = 1

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

Era:	Paleozoic	Period:	Ordovician
Genesis:	Volcex	Form:	Layer
Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:	Gula Complex
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Quartz	Major mineral (>10%)
Ore mineral	Magnetite	Major mineral (>10%)
Ore mineral	Hematite	Major mineral (>10%)
Ore mineral	Pyrite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	Banded quartzite	Sedimentary Original rock :Exhalite
		Metamorphic facies :Greenschist

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :15 / 65	Post-mineralisation ;...Effect :Modifies