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Occurence 0 - 000 FEIL
(Object Id: )
(Last updated: 19.12.2022)
Location
County: Municipality: Mangler ()
Map 1:50000: Nannestad (1915-3) Map 1:250000: Hamar
Coordinate system: UTM-Zone 33 - EUREF89/WGS84
East: 603550 m. North: 6672950 m.
Longitude: 10.8666350 Latitude: 60.1788540
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

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


Mineralization
Era: Paleozoic Period: Permian
Genesis: Skarn formation Form: Lens
Main texture: Structureless Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: Skarn formation
Strike/Dip: 305 / 70 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Oslo Region
Geotec.unit: Akershus Graben
Tectonic complex:
Igneous complex: Nordmarka-Hurdal Batholith
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Feldspar Subordinate mineral (1-10%)
Gangue mineral Garnet Subordinate mineral (1-10%)
Ore mineral Sphalerite Major mineral (>10%)
Ore mineral Pyrite Subordinate mineral (1-10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Wall rock Biotite hornfels Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Contact
Wall rock hedenbergite skarn Sedimentary
Original rock :Limestone
Metamorphic facies :Contact

Information(s) in free text format
Free text
Gruva som er beskrevet av Ihlen (1978) ble ikke påvist ved befaringen in 2021, men en rekke mindre gruver og skjerp ble funnet i området. Ifølge Ihlen (1978) er malmen knyttet til 1-2 m mektige skarnsoner i en opprinnelig isoklinal foldet mellom-ordovicisk kalkstein. Skarnsonene er omgitt av biotitthornfels, og langs kanten av disse er hornfels omvandlet til diopsid-alkalifeltspatbergart. Sinkblende opptrer som disseminerte korn, årer, segregasjoner og tynne lag i hedenbergitt og hedenbergitt-granat skarn. Sinkmineraliseringen er meget uregelmessig og over store partier finnes bare magnetkis og svovelkis i skarn (Ihlen 1978). Driften i hovedforekomsten som ble befart i 2021 består av en 14 m lang dagskjæring med retning 215°. Innerst i skjæringen er blottet en 20-30 cm bred sone med tilnærmet massiv, finkornet sinkblende i hedenbergittskarn. Grågrønn, finkornet hornfels dominerer ellers i veggene i dagskjæringen.

Bibliography:
From NGU's Reference Archive:
Ihlen, Peter M. , 1978
Malmgeologisk undersøkelse og kartlegging av Kongen, Sulitjelma, Røros, Øvre og Nedre Grubelien og Dalstjern gruver i Elsjøfeltet.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1575/16B;8 pages
Abstract:
I Elsjøfeltet kan tre typer kontakt-metasomatiske malmer skilles ut: 1) Sinkblende-magnetkis og sinkblende-magnetitt malmer, henholdsvis i hedenbergitt-granat og granat-epidot skarn i omvandlede 1-2 m tykke kalksteinslag 2) Sinkblende-magnetitt-blyglans-Bi-sulfosalter i granat-epidot skarn langs forkastninger i hornfelser. 3) Sinkblende-magnetkis i hedenbergitt-granat-skarn i omvandlede bitumenøse kalklinser. Marmor og skarlinser som opptrer i alunskifer fører assosiert en granat-grafitt skarn med relativt høyt uraninnhold. Til type 1 og 2 hører henholdsvis Dalstjern, Nedre og Øvre Grubelien gruver og Erdmann gruve. Til type 3 hører Kongen, Sulitjelma og Røros gruve. Den sistnevnte type er interessant m.h.p. store tonnasjer av lavprosentlige Zn-U malm. Type 1 og 2 har for små mektigheter og for uregelmessig fordeling av sinkblende til å bli betraktet som interessant.

Olerud, Svein , 1984
Metallogeny of the Elsjø area, northern Oslo Region, Norway.
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.64 (4);325-334 pages
Abstract:
The Elsjø area is situated in the northern part of the Oslo Region and consists of a 2 km² inlier of Palaeozoic metasediments. Cambro-Ordovician shales and limestones are enclosed in Permian intrusives and are contact metamorphosed and altered by metasomatic processes. The present investigation has defined three mineralisation types of interest: The heavy-metal content of the Alum shale, sphalerite-bearing skarn lenses within the Alum shale and molybdenite mineralisation in the underlying Permian granites. The Alum shale of the Elsjø area has a maximum thickness of more than 150 metres as a result of overthrusting and folding during the Caledonian orogeny. The highest heavy-metal content is in Upper Cambrian strata. The greatest average content is in 10.6 m thick layer with 160 ppm U, 200 ppm Mo, 930 ppm V, 11.6 % C and 2.8 % S. The Alum shale also contains lenses of hedenbergite-garnet skarn lenses with sphalerite mineralisation; these are alteration products of marble lenses in the shale. Similar sphalerite-bearing skarn mineralisation is also found in other stratigraphic levels on shear zones. The Palaeozoic sedimentary rocks are underlain by three types of Permian granites. Molybdenite occurs as scattered disseminations in the phyllic alteration zones of the granite. Propylitic alteration is common in both the underlying intrusives and in the Palaeozoic sediments. The molybdenite mineralisation has similarities with porphyry molybdenum type occurrences, but can also be interpreted as a roof zone mineralisation in the granites.

Fieldsamples
Sample No. Sample type Miscellanrous
JS-OS2141 Bedrock
Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2
Comment: Semi-massive shalerite-pyrrhotite in hedenbergite skarn
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Nedre Gruvelia 2
(Object Id: 38202 15,01,00)
Location
County: Municipality: Mangler ()
Map 1:50000: Nannestad (1915-3) Map 1:250000: Hamar
County: UTM-Zone 33 - EUREF89/WGS84
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn
Resources and production
Activity: Test mining Reserves:
Operating method: Open pit and underground mining Historical production:


Mineralogy
Relationship Mineral Amount
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Feldspar Subordinate mineral (1-10%)
Gangue mineral Garnet Subordinate mineral (1-10%)
Ore mineral Sphalerite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Host rock Hedenbergite skarn Sedimentary
Original rock :Limestone
Metamorphic facies :Contact
Wall rock Biotite hornfels Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Contact

Information(s) in free text format
Free text
Forekomsten ligger rett ovenfor (NV) for den gamle gruveveien og består av en 5 m lang dagåpning som fører inn til en vannfylt stoll med retning 230°. I dagåpningen dominerer biotitthornfels og ved stollinngangen finnes skarnomvandlet hornfels med magnetkis på stikk. På tippen nedenfor veien finnes blokker med massiv til semimassiv sinkblende og mindre mengder magnetkis og kobberkis i hedenbergittskarn.

Fieldsamples
Sample No. Sample type Miscellanrous
JS-OS2139 Dump
Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2
Comment: Massive/semi-massive sphalerite in hedenbergite skarn
No. of registrated element analyses = 1
JS-OS2140 Dump
Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2
Comment: Massive/semi-massive sphalerite and pyrrhotite+chalcopyrite veinlets in hedenbergite skarn
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Nedre Gruvelia 3
(Object Id: 38203 15,02,00)
Location
County: Municipality: Mangler ()
Map 1:50000: Nannestad (1915-3) Map 1:250000: Hamar
County: UTM-Zone 33 - EUREF89/WGS84
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Mineralogy
Relationship Mineral Amount
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Garnet Subordinate mineral (1-10%)
Gangue mineral Feldspar Subordinate mineral (1-10%)
Ore mineral Sphalerite Major mineral (>10%)
Ore mineral Pyrite Subordinate mineral (1-10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Host rock Hedenbergite skarn Sedimentary
Original rock :Limestone
Metamorphic facies :Contact
Wall rock Biotite hornfels Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Contact

Information(s) in free text format
Free text
Dette er en vannfylt synk med sidevegger 6 x 2 m, og kan representere en del av Nedre Gruvelia gruve som er beskrevet av Ihlen (1978). I veggene dominerer skarnomvandlet biotitthornfels. Sinkblende i granat-hedenbergittskarn finnes i blokker i den relativt store, men svært overgrodde tippen.

Fieldsamples
Sample No. Sample type Miscellanrous
JS-OS2142 Dump
Sampler: Sandstad/Mansur/...Stored: Løkken/...Size(kg): 2
Comment: Semi-massiv sphalerite i garnet-hedenbergite skarn
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

The fact sheet was created on 26.04.2024
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