Norsk versjon
	THE ORE DATABASE
	Occurence 5038 - 009 Skjækerdalen
	(Object Id: 124) (Last updated: 21.03.2013)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Cu	0.63 %	05.06.1997
	Ni	1.26 %	05.06.1997

Operations

	From - To	Activity	Comments
	1876 - 1891	Regular production	Uregelmessig drift 1876 - 1881. Sammenhengende drift 1881 - 1891. Smeltehytte ved Skjækerfossen bygd i 1881.

Mineralization

	Era:	Paleozoic	Period:	Silurian
	Genesis:	Orthomagmatic formation	Form:	Irregular
	Main texture:		Min. distribution:

Main grain size:

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Silurian

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

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Olivine	Major mineral (>10%)
	Gangue mineral	Plagioclase	Major mineral (>10%)
	Gangue mineral	Pyroxene	Major mineral (>10%)
	Gangue mineral	Titanite	Accessory mineral (<1%)
	Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Ilmenite	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Pentlandite	Accessory mineral (<1%)
	Ore mineral	Violarite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Gabbro	Intrusive
	Host rock	Quartz diorite	Intrusive Original rock :Quartz diorite
			436 mill. years;..Method:U/Pb

Information(s) in free text format

Description

The Skjækerdalen Ni-Cu deposit in the northern part of Trøndelag, central Norway, was found in the 1860s and mining commenced in 1876. During the first 5 years only irregular production occurred, but from 1881 to 1891 the deposit was in regular production. A smelter was constructed at Skjækerfossen in 1881. Peak mine production was in 1883 with 3485 metric tonnes of ore with about 1% Ni. The mine was closed in 1891. Total production was about 19 000 tonnes containing 1.26% Ni and 0.63% Cu. The deposit is located in the Skjækerdalen igneous complex, a synorogenic intrusion approximately 4 x 1.5 km in the metapelites of the Gula Group, Trondheim Nappe Complex (Hildreth et al. 2001). The intrusion comprises quartz gabbro with a quartz diorite rim and a central brecciated core with gabbro fragments in a leucocratic dioritic and/or trondhjemitic matrix. Mineralisation consists of magmatic sulphides present in some of the gabbro fragments. The PGE in the sulphides is low, possibly caused by an early phase of olivine-chromite cumulate formation and differentiation, scavenging the silicate melt.

Free text

The Skjækerdalen Ni-Cu deposit in the northern part of Trøndelag, central Norway, was found in the 1860s and mining commenced in 1876. During the first 5 years only irregular production occurred, but from 1881 to 1891 the deposit was in regular production. A smelter was constructed at Skjækerfossen in 1881. Peak mine production was in 1883 with 3485 metric tonnes of ore with about 1% Ni. The mine was closed in 1891. Total production was about 19 000 tonnes containing 1.26% Ni and 0.63% Cu. The deposit is located in the Skjækerdalen igneous complex, a synorogenic intrusion approximately 4 x 1.5 km in the metapelites of the Gula Group, Trondheim Nappe Complex. The intrusion comprises quartz gabbro with a quartz diorite rim and a central brecciated core with gabbro fragments in a leucocratic dioritic and/or trondhjemitic matrix. Mineralisation consists of magmatic sulphides present in some of the gabbro fragments. The PGE in the sulphides is low, possibly caused by an early phase of olivine-chromite cumulate formation and differentiation, scavenging the silicate melt.

Bibliography:

From NGU's Reference Archive:

Hildreth, Stephen C.; Grenne, Tor; Sharp, W. E. , 2001

	Genesis of Ni-Cu sulphide ore at the Skjækerdalen intrusive complex, central Norway.

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.81 (1);49-58 pages

Abstract:

The Skjækerdalen igneous complex is a synorogenic intrusion approximately 3-4 km long and 1-1.5 km wide situated in Gula Group metapelites of the Trondheim Nappe Complex in the central Norwegian Caledonides. The intrusion comprises quartz gabbro with a quartz diorite rim and a central brecciated core with gabbro fragments in a leucocratic dioritic and/or tronhjemitic matrix. Interstitial magmatic sulhphides are present in some of the gabbro fragments in the brecciated core. Sixteen samples of low- to high-grade mineralization have been analysed for Ni, Cu, Co, Au and platinum group elements. Recalculated to 100% sulphide, average concentrations are: 7.6% Ni, 4.6% Cu, 0.3% Co, 634 ppb Au, 99 ppb Os, 68 ppb Ir, 167 ppb Ir, 90 ppb Rh, 120ppb Pt and 171 ppb Pt and 171 ppb Pd. PGE concentrations in magmatic sulphides at Skjækerdalen are low in comparison with deposits of comparable Ni and Cu contents (e.g. Sudbury, Noril'sk). We propose that an early olivine-chromite cumulate formed during differentation in a temporary magma chamber at deeper levels, which scavenged much of the PGE from the silicate magma. Further differentation led to formation of Ni-Cu-rich, immiscible sulphide droplets that settled through magma which was now depleted in PGE. Further differention led to formatio of a layered intrusion which graded upwards into quartz gabbro and quartz diorite. With the exception of the inferred, solidified and "immobile", olivine-chromite-PGM cumulate, the partly crystallized intrusion was remobilized through diapiric-like flow to higher levels as a consequence of syn-magmatic tectonic activity. This resulted in the present, "reverse", configuration of rock types and preservation of the PGE-depleted Ni-Cu sulphides only in gabbro fragments in the central magmatic breccia.

Logn, Ø.; Sæther, E.; Brækken, H. , 1951

	Forsøksmålinger Skjækerdalen nikkelforekomst

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.67;21 pages

Abstract:

Undersøkelsen inngår i en serie forsøksmålinger, utført for Statsbevilgninger, med det formål å klarlegge geofysiske metoders anvendbarhet for påvisning av nikkel- og kromforekomster. Tidligere er fremlagt resultater av undersøkelser over forekomstene Ertelien, Høgåsen, Råna og Feragen. Som grunnlag for anlegget av forsøksmålingene hadde man bergingeniør Kjell Amdahl's beskrivelse av feltet i hans eksamensarbeide ved NTH 1935. Da man under målingene fant det ønskelig å få et mer utførlig bilde av feltets geologi påtok amanuensis E. Sæther seg å foreta en orienterende undersøkelse. Hans beskrivelse bilagt kartskisser inngår i GM's rapport. Den geofysiske undersøkelse omfatter el.magn. målinger (Turam) og magnetiske målinger over et ca. 1,2 km2 stort område. Ved Turammålingene fremkom kun svake eller meget svake indikasjoner over grubene/skjerpene. Ved de magnetiske målingene ble det observet tildels markerte anomalier, men disse kan ikke sees å ha noen direkte korrespondanse med selve malmsonene. Målingene kan tyde på at de kjente malmforekomstene i feltet er små. Det kan imidlertid likevel være grunn til å utføre egnete grundigere geofysiske undersøkelser i feltet.

Eidsvig, Per , 1972

	Vertikalsondering med indusert polarisasjon og ledningsevne Sjækerdalen.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1060;9 pages

Eidsvig, Per , 1970

	Geofysiske målinger Skjækerdalen.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.980;9 pages

Løvaas, L. B. , 1970

	En malmgeologisk undersøkelse av Skjækerdalens Ni-Cu-sulfidforekomst.

;NTH Bergavd.;AVHANDLING

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	SKJ94-12B	Hand specimen	Comment: Sulphide-rich gabbro breccia No. of registrated element analyses = 1
	SKJ94-12C	Hand specimen	Comment: Sulphide-rich gabbro breccia No. of registrated element analyses = 1
	SKJ94-12D	Hand specimen	Comment: Sulphide-rich gabbro breccia No. of registrated element analyses = 1
	SKJ94-13	Hand specimen	Comment: Sulphide-rich gabbro breccia No. of registrated element analyses = 1

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

Name of Locality: Barbara Bachke

(Object Id: 7014 9,01,00)

Location

County:

Trøndelag

Municipality:

Verdal (5038)

Map 1:50000:

Vuku (1722-1)

Map 1:250000:

Østersund

Coordinate system:

EU89-UTM Zone 32

East:

652020 m.

North:

7084641 m.

Longitude:

12.0930270

Latitude:

63.8558980

Show on map

Resource

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

Resources and production

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

Name of Locality: Slipern

(Object Id: 7015 9,02,00)

Location

County:

Trøndelag

Municipality:

Verdal (5038)

Map 1:50000:

Vuku (1722-1)

Map 1:250000:

Østersund

Coordinate system:

EU89-UTM Zone 32

East:

651788 m.

North:

7084505 m.

Longitude:

12.0881830

Latitude:

63.8547840

Show on map

Resource

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

Resources and production

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

Name of Locality: Anton Bachke

(Object Id: 7016 9,03,00)

Location

County:

Trøndelag

Municipality:

Verdal (5038)

Map 1:50000:

Vuku (1722-1)

Map 1:250000:

Østersund

Coordinate system:

EU89-UTM Zone 32

East:

652233 m.

North:

7084715 m.

Longitude:

12.0974320

Latitude:

63.8564730

Show on map

Resource

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

Resources and production

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

Name of Locality: St. Olav

(Object Id: 7017 9,04,00)

Location

County:

Trøndelag

Municipality:

Verdal (5038)

Map 1:50000:

Vuku (1722-1)

Map 1:250000:

Østersund

Coordinate system:

EU89-UTM Zone 32

East:

652424 m.

North:

7085003 m.

Longitude:

12.1016000

Latitude:

63.8589710

Show on map

Resource

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

Resources and production

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

Name of Locality: Homan

(Object Id: 16259 9,05,00)

Location

County:

Trøndelag

Municipality:

Verdal (5038)

Map 1:50000:

Vuku (1722-1)

Map 1:250000:

Østersund

County:

(No coordinates)

Resource

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

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit mining	Historical production:

Name of Locality: Archbold

(Object Id: 16260 9,06,00)

Location

County:

Trøndelag

Municipality:

Verdal (5038)

Map 1:50000:

Vuku (1722-1)

Map 1:250000:

Østersund

County:

(No coordinates)

Resource

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

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit mining	Historical production:

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Analyse Results

from

Deposit Area 5038 - 009 Skjækerdalen

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)

Sample No.	Sample Type	Cu*	Co*	Ni*	Au#	S%	Cr*
SKJ94-12B	Hand specimen	2719	145	5300	23.0	2.63	76
SKJ94-12C	Hand specimen	1874	142	5300	182.0	2.75	352
SKJ94-12D	Hand specimen	1183	94	2129	27.0	.77	103
SKJ94-13	Hand specimen	3547	57	16000	15.0	1.62	49

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The fact sheet was created on 29.04.2024

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

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