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THE ORE DATABASE
Deposit Area 1739 - 051
(Last updated 22.des.1998)

Name of Deposit Area : Orklumpen
(Object Id : 1739,051,00,00)
Drill Cores from the Deposit Area: See Borehole Area Orklumpen

Location
County : Nord-Trøndelag (17) Municipality : Røyrvik (1739)
Map 1:50000: Jomafjellet (1924-1) Map 1:250000: Grong
Marking point: Longitude: 13.9293820 Latitude: 64.8763110
EU89-UTM Zone 33 (Coordinates NOT confirmed)
X-coord: 449281 m. Y-coord: 7195098 m.

Commodity
Main Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Sub Type: Copper
Element(s): Kis Cu
Production
Activity: Exploration Reserves:
Prod. method: Production:
Prod. status: Volume of dump:

Importance
Public: Not Assessed (reg. 18.02.2015)
Economical: Not classified/evaluated

Mineralization
Era: Period:
Dating: Method:
Genesis: Form:
Main texture: Min. distribution:
Main grain size: Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Information(s) in free text format
Free text
Forekomsten er beskrevet av Oftedahl (1958, skjerp nr. 5), men er senere ikke påvist. Geologiske, geokjemiske og geofysiske undersøkelser ble gjort av NGU i 1971 uten at mineraliseringer av betyding ble påvist. Berggrunnen består hovedsakelig av fyllitt som tilhører Røyrvikgruppen. Denne er lokalt noe rusten på grunn av svak sulfiddisseminasjon.

Bibliography:
From NGU's Reference Archive:
Oftedahl, Christoffer , 1958
Oversikt over Grongfeltets skjerp og malmforekomster.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.202;1-75 + fo pages
Abstract:
Ore occurences of the Grong area: In the period 1910-1918 a great number of ore occurences were discovered in the Grong area. The late state geologist Steinar Foslie mapped the area in the years 1922-1931. Foslie also mapped all claims and occurences and made special field investigations in a few cases. This book presents a survey of all occurences chiefly based on the field observations of Foslie. In addition the present author has done some field work in connection with the three large deposits, Joma, Skorovass, and Gjersvik. The map, Plate 1, shows the areal geology and the location of the occurrences, numbered from 1 to 131. the ore of the occurrences is chiefly pyrite. The larger occurrences also contain some chalcopyrite and sphalerite etc. and the smaller occurrences contain ither pure pyrite with some magnetite. The Joma deposit (No. 1), contains about 15.5 mill. tons of ore. The ore zone forms an arc and is situated within a thick series of greenstones (Fig. 1). The Skorovass mine (No. 2), contains about 7,5 mill. tons of ore. The deposit is situated in a greenstone complex (Fig. 7), and is immediately surrounded by asid tuffs of quartz keratophyric composition (Table 1).

Logn, Ø. , 1973
Geologiske, geofysiske og geokjemiske undersøkelser Grongfeltet/Grongprosjektet.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1065
Abstract:
Under oppdragsnummer 1065 ble det utført undersøkelser på en rekke objekter. Det vises til NGU Rapport nr. 84.091: Statusrapport for geofysikk utført i Nord-Trøndelag fylke (1984).


The fact sheet was created on 19.05.2024

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