Norsk versjon
	THE ORE DATABASE
	Occurence 1806 - 041 Gautelis
	(Object Id: 2379) (Last updated: 19.06.2020)

Mineralization

	Era:	Paleozoic	Period:	Devonian
	Genesis:	Shear zone formation	Form:	Plate
	Main texture:	Fracture filling	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

	Province:	Caledonian Basement Province
	Geotec.unit:	Rombak Complex
	Tectonic complex:
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Calcite	Major mineral (>10%)
	Gangue mineral	Dolomite	Major mineral (>10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Gangue mineral	Barite	Accessory mineral (<1%)
	Ore mineral	Arsenopyrite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)
	Ore mineral	Hessite	Accessory mineral (<1%)
	Ore mineral	Argentite	Accessory mineral (<1%)
	Ore mineral	Bismuth	Accessory mineral (<1%)
	Ore mineral	Galena	Accessory mineral (<1%)
	Ore mineral	Uraninite	Accessory mineral (<1%)
	Ore mineral	Gold	Accessory mineral (<1%)
	Ore mineral	Scheelite	Accessory mineral (<1%)
	Ore mineral	Molybdenite	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Thorite	Accessory mineral (<1%)

Information(s) in free text format

Abstract

The deposit is situated in the Rombak Tectonic Window (RTW, also called the Rombak Basement Window) near the Swedish border SSE of Narvik. The RTW is characterised by (1) Paleoproterozoic supracrustal rocks including ultramafic lavas, Mg-rich basalts, andesites and rhyolites as well as pelites and greywackes. These rocks are believed to have been deposited in an active continental margin setting. (2) The supracrustals are intruded by large volumes of granites and a variety of mafic intrusions. For more detailed information see Korneliussen & Sawyer (1989), Sawyer & Korneliussen (1989) and Angvik & Korneliussen (2013). (3) A complex multistage crustal-scale ductile shear zone array is intersecting the RTW (Angvik et al. 2014). As summarised by Angvik & Sandstad (2014) the following main types of sulphide mineralization have been identified within the RTW; from with the oldest these are: (1) Syn-sedimentary Pb-Zn and Fe-sulphide SEDEX deposits. (2) Syn-orogenic metasomatic As-Au-Cu deposits. The Gautelisfjell deposits (see below) belong to this category. (3) Orogenic gold deposits with Au-As enrichments along shear-zones. (4) Late orogenic Cu-Au quartz veins. The Gautelisfjell area is characterised by an older complex of tonalitic rocks (1940 Ma, Romer 1992) that have been eroded and is overlain by a conglomerate, and after that by pelite-greywacke rocks. The whole sequence is intruded by granites (1770 Ma, Romer 1992) and a variety of mafic intrusions. The Gautelisfjell As-Au deposit occurs close to the contact between the marble and the greywackes, spatially associated with a dolerite dyke. Disseminated and semi-massive gold-bearing arsenopyrite is found in the marble and the neighbouring metagreywackes and hornblende schist (that is interpreted to be a sheared metadolerite dyke, see below). The deposit was subject to test-mining in 1916-1920 (Bugge and Foslie, 1922). Fairly detailed investigations were carried out in 1983-86 by Folldal Verk A/S, as summarised by Korneliussen et al. (1986). Folldal Verk drill-core data shows gold grades up to 6-7 ppm in 3 m sections. No reliable tonnage data is available. The identified gold mineralisations in the area are scattered and all-in-all of low-grade. Ore-genetic relationships were studied by Skyseth and Reitan (1995) who concluded that the ore deposition is related to Caledonian greenshist facies retrogression with the mineralisations derived from high saline fluids. However, the area was some years later investigated by Angvik and Sandstad (2014) who concluded that the ore mineralisations are related to Paleoproterozoic structures, with a close relationship to a sub-vertical metadolerite that crosscuts the marble and the overlying greywacke. Although the geological relationships are complex, a favoured interpretation is that there is a structural control of the intrusion of dolerite and that the same structures have been channels for As-Au bearing fluids. If so, such dolorites may be a guide to ore.

Photo(s) from the Deposit area:

Photo no. 1 showing Utsikt fra tippen mot Kjørrisvatna" Photo no. 2 showing Skjerp"

Bibliography:

From NGU's Reference Archive:

Bugge, Carl; Foslie, Steinar , 1922

	Norsk arsenmalm og arsenikfremstilling

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.106;33 pages

Abstract:

The present paper is published by NGU as a report from "Statens Raastofkomite" on the emergency production of arsenic during the war when the supplies, ordinarily imported, were cut off. The paper also contains a synopsis of the geology of the arsenic deposits of Norway. Pages 4-7 contain a description of the old smalt works of Modum in Southern Norway, where, many years ago, cobalt ore was mined for smalt, arsenic being obtained as a bi.product. The ore forms "fahlbands" and is too poor to be mined with profit at present. On pages 7-10 the Listøli arsenic mine in Telemark in Southern Norway is described. The ore occurs in a dike which is from 0,15 to 1 m wide. Besides arsenopyrite some tetrahedrite and molybdenite also occur. The total production from this mine amounts to about 400 tons of arsenic ore with an average content of 25-30 pct. As. On pages 10-20 the arsenic ores of Northern Norway are described. Arseno- pyrite is the only arsenic ore known from this part of the country.

Korneliussen, Are; Tollefsrud, Jan Inge; Flood, Boye; Sawyer, Edward , 1986

	Precambrian volcano-sedimentary sequences and related ore deposits, with special reference to the Gautelisfjell carbonate-hosted gold deposit, Rombaken basement window, Northern Norway

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.86.193

Abstract:

Frie emneord: zink. Sammendrag på norsk: Suprakrustalene i Rombakvinduet består av en kompleks serie med vulkanske bergarter, pelittiske sedimenter, gråvakker, med mindre innslag av karbonater og kvartsitter. De intruderes av mafiske ganger, mafiske-intermediære plutoner og granitoide batolitter (1700-1800 mill. år). Området har gjennomgått nedre amfibolittfacies metamorfose etterfulgt av retrogradering til grønnskiferfacies langs et N-S-gående lineament. Skjær- soner langs dette lineamentet har virket som kanaler for H2O-CO2 førende løsninger. Forskjellige typer av malmforekomster opptrer i karakteristiske geologiske miljøer: (1) disseminert gull i karbonater innenfor en vulkanitt-sediment serie (Gautelisfjell forekomst), (2) disseminerte til massive Zn-Pb minerali- seringer innenfor kalk-silikat horisonter i tuffitt/gråvakke-sekvenser og assosiert med skjærsoner, og (3) disseminerte til massive Cu-Fe minerali- seringer assosiert med mafiske vulkanitter. Interessante måleområder for gull er: (1) karbonat +/- sulfid-anrikede horisonter av mulig exhalative-hydrotermal opprinnelse i sure vulkanitter og (2) skjærsoner som har virket som kanaler for hydrotermale løsninger.

Skyseth, T.; Reitan, P. , 1995

	Geology and genesis of Gautelisfjell gold deposit, Rombak window, northern Norway: a link between retrograde caledonian metamorphism and saline fluids.

;Grønlands geologiske undersøgelse;ARTIKKEL;Open file series; Gold mineralization in the Nordic countries and Greenland. Extended; abstracts; No.95/10;94-98 pages

Romer, R.L.; Kjøsnes, B.; Korneliussen, A.; Lindahl, I.; Skyseth, T.; Stendalo, M.; Sundvoll, B. , 1992

	The Archaean-Proterozoic boundary beneath the Caledonides of northern Norway and Sweden: U-Pb, Rb-Sr, and isotope data from the Rombak-Tysfjord

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.91.225;67 pages

Abstract:

The Baltic Shield includes an Archaean craton in northeastern Finland. Early Proterozoic accretions to this Archaean craton comprise of (1) the Svecofen- nian domain, which consists of island arc volcanic and sedimentary rocks that formed at 1.94 - 1.85 Ga and that between 1.83 and 1.78 Ga became inten- sely intruded by post-orogenic granites and (2) the Transscandinavian Granite Porphyry Belt (TGPB), which represents a 1.80 - 1.70 Ga magmatic arc at the western and southwestern margin of the Svecofennian domain. The TGPB granites extend across the boundary between the Archaean and Svecofennian crustal blocks. This boundary is in Finland a dextral strike-slip fault zone (Raahe- Ladoga zone) that to the west (Sweden and Norway) widens to a ca. 250 km wide heterogeneous zone.

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

Angvik, T.L., Bagas, L. & Korneliussen, A. 2014: Geochemical evidence for arc-related setting of Paleoproterozoic (1790 Ma) volcano-sedimentary and plutonic rocks of the Rombak Tectonic Window. In Angvik, T.L. Ph.D. thesis, University of Tromsø.

Angvik, T.L., Henderson, I. & Bergh, S. 2014: Swecofennian shear zone network of the Rombak Tectonic Window, North Norway: Structural architecture and egional correlation with the Fennoscandian shield. In Angvik, T.L. Ph.D. thesis, University of Tromsø.

Angvik, T.L. & Sandstad, J.S. 2014: The timing of sulfide mineralisation in the Rombak Tectonic Window and their spatial relation to the Rombak-Skjomen Shear Zone, northern Norway, In Angvik, T.L. Ph.D. thesis, University of Tromsø.

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The fact sheet was created on 04.05.2024

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