Norsk versjon
	THE ORE DATABASE
	Occurence 5026 - 016 Storvollen
	(Object Id: 4409) (Last updated: 22.03.2024)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Cu	2 %	22.03.2024

Operations

	From - To	Activity	Comments
	1855 - 1870	Regular production
	1906 - 1909	Regular production	Company/Institution :Verstraete & fils
	1916 - 1918	Regular production	Company/Institution :A/S Storvoll grube

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Genesis:	Sedex	Form:	Plate
	Main texture:	Cataclastic	Min. distribution:	Massive (>50 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:	220 / 50	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

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

Group:

Dalsbygdgruppen

Formation:

Kjurudalsformasjonen

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Chlorite
	Gangue mineral	Quartz	Major mineral (>10%)
	Ore mineral	Sphalerite
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Glimmerskifer	Sedimentary Original rock :Siltstone
			Metamorphic facies :Greenschist
	Wall rock	Kvartskeratofyr	Extrusive Original rock :Tuff
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fold axis	Strike/Dip :60 / 10	Post-mineralisation ;...Effect :Modifies
	Host rock	Primary layering	Strike :220	Syn-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Forekomsten omfatter et større område (ca. 200x300 m) med mange sjakter, røsk og stoller. Rundt disse finnes en mengde tipper med forskjellig materiale, vesentlig gråberg med grå, biotittrik, dels tett isoklinalfoldet skifer. I området rundt gruva sees mange parallelle kvartslinser/-ganger i bergarten, og på tippen ved nedre hovedstoll finnes mye kvartsmateriale (hydrotermalkvarts). Malmen består av en rekke linjaler med kort lateral utbredelse; det geofysiske anomalibildet (EM-målinger 1948) viser dette, samt at mange anomalier ikke ble undersøkt (røsket) i gruvens driftsperiode. Foldestrukturer i ulik skala gir lite representative målinger av strøk/fall, slik at de angitte tall representerer den generelle trenden. Iselve malmen sees den typiske metamorfe "durchbewegung"-tekstur. Malmen domineres av en po-cp-type, mens py-cp(-sl)-malm er sjeldnere. På tippen synes forholdet mellom disse å være 20:1 eller 30:1. Hovedsjakta er inngjerdet og dels nedrast, slik at prøvetaking ikke var tilrådelig. I andre røsk sees <30-40 cm mektige malmsoner med po-cp-malm. Ellers finnes noe finfordelt po og cp i sidebergarten.

Bibliography:

From NGU's Reference Archive:

Aasgaard, Gunnar , 1927

	Gruber og skjerp i kisdraget Øvre Guldal-Tydal.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.129;1-196 pages

Abstract:

The occurences described in this paper form a connection between th mining districts around Røros to the south and those around Meråker to the north. The occurences lie in mountain regions partly above the forest line. The list on page 12 contains the names of all known occurrences of whatever size within the district considered. Pl. I is a geological outline map of the district, compiled from maps in the Norwegian Geological Survey. In a geological summary on pages 18-27 it is shown that no pyrite occurrences of economic importance so far have been found in an eastern zone along the Swedish boundary where the rocks consist of hard schist with sparagmites, and igneous rocks. Neither have such occurrences been found in a zone of "Stuedalsskifer" and an other zone of "Gulaskifer" towards west, both indicated on the map. The occurrences of pyrite are chiefly found in connection with fine grained, light green or gravish, partly feldspar bearing schist and in connection with green schists, mostly fine grained hornblende schists. All these zones of schist gnereally strike north and dip west. The pyrite bearing schist lie on both sildes of a large zone of igneous rocks extending from Kjølifjell in the south over Hyllingen and Melshogna to Fangen in the Meråker district in the north.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	ST0207.01	Bedrock	Sampler: Størseth, L.R./...Stored: Løkken Comment: Sidebergart. Tett isoklinalfoldet glimmergneis, Fra røsk ovenfor hovedsjakten.
	ST0207.02	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Disseminert po-cp-malm fra samme røsk.
	ST0207.03	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Dels stripet, massiv, middelskornet py-sl-malm fra tippen ved hovedsjakta.
	ST0207.04	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Grov- til middelskornet py-po-cp-malm.
	ST0207.05	Bedrock	Sampler: Størseth, L.R./...Stored: Løkken Comment: Disseminert po-sl-malm fra nedre hovedstoll.
	ST0207.06	Bedrock	Sampler: Størseth, L.R./...Stored: Løkken Comment: Semimassiv cp-sl-po-malm fra nedre hovedstoll.
	ST0207.07	Bedrock	Sampler: Størseth, L.R./...Stored: Løkken Comment: Sprø, massiv py-malm fra nedre hovedstoll.
	ST0207.08	Bedrock	Sampler: Størseth, L.R./...Stored: Løkken Comment: Massiv po-cp-malm fra nedre hovedstoll.

Name of Locality: Storvollen II

(Object Id: 6663 16,01,00)

Location

County:

Trøndelag

Municipality:

Holtålen (5026)

Map 1:50000:

Haltdalen (1620-1)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

612419 m.

North:

6963892 m.

Longitude:

11.2037670

Latitude:

62.7880010

Show on map

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Copper
			Element(s):	Kis Cu Zn

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Name of Locality: Per Borrenskjerpet

(Object Id: 6664 16,02,00)

Location

County:

Trøndelag

Municipality:

Holtålen (5026)

Map 1:50000:

Haltdalen (1620-1)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

612618 m.

North:

6963142 m.

Longitude:

11.2071800

Latitude:

62.7812130

Show on map

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Copper
			Element(s):	Kis Cu Zn

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

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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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