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THE ORE DATABASE
Deposit 1841 - 028 Jakobsbakken
(Object Id: 2644)
(Last updated: 15.12.2015)
Belongs to the Province: Sulitjelma provins

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543479 m. North: 7442349 m.
Longitude: 16.0011460 Latitude: 67.0952650
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn Cu Kis Co
Importance
Raw material meaning: Little Importance (reg. 01.06.2015)
Historical: Yes , (Confirmed 15.des.2015 by Agnes Raaness)

Resources and production
Activity: Mining Reserves: 30 thousand tons
Operating method: Underground mining Historical production: 4470 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Cu 1.55 % 10.08.1994
Kis 31.0 % 10.08.1994
Zn 2.42 % 10.08.1994

Operations
From - To Activity Comments
1896 - 1968 Regular production Company/Institution : " "
1900 - 1961 Core drilling Company/Institution : " "
1905 - 1968 Geology Company/Institution :Sulitjelma Gruber A/S
1938 - 1981 Geophysics Company/Institution : " "

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Sedex Form: Layer
Main texture: Breccia cement Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Very unevenly grained Main alteration: Chloritisation
Strike/Dip: 180 / 30 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Køli Nappe Complex
Tectonic complex: Kølidekkekomplekset
Igneous complex:
Group: Sulitjelmgruppen Formation: Otervassformasjonen

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

Lithology:
Relationship Rock Origin
Host rock Amfibolitt Extrusive
Original rock :Tuff
Metamorphic facies :Amphibolite
Wall rock Glimmerskifer Sedimentary
Original rock :Sandstone
Metamorphic facies :Amphibolite

Information(s) in free text format
Abstract
This mine was an important mine, but is now (2015) considered empty and hence it has been assessed as a deposit of no or little importance with minor economical importance.
Description
The Sulitjelma Area includes more than 20 deposits with a total tonnage in excess of 35 Mt (Cook et al. 1990). The average grades of the 25 Mt mined from 11 deposits between 1887 and 1991 were 1.84 % Cu and 0.86 % Zn. Contents of precious metals were 10 g/t Ag and 0.25 g/t Au (Cook et al. 1990). The deposits are concentrated in an area of 25 km2, and are located at varying stratigraphic-structural levels in the Otervann Volcanic Formation (Cook et al., 1990), also known as the Sulitjelma amphibolites, in the Upper Allochthon Køli Nappe Complex. The palaeotectonic setting of the volcanic rocks is disputed. According to Boyle (1989), the volcanic rocks form the extrusive part of the Sulitjelma ophiolite complex, underlain by sheeted dikes of the Mietjerpakte Intrusive Complex and below that the Sulitjelma Gabbro Complex. Inclusions of Precambrian gneiss in the Gabbro have been interpreted to show that the ophiolite complex represents a fragment of an ensialic marginal basin (Cook et al. 1990). The gabbro has been dated to 437 ± 2 Ma (Pedersen et al. 1991), and because of the cogenetic relationships between the young gabbro and the volcanic rocks, it has been argued that the term ophiolite complex is inappropriate (Grenne et al. 1999). Structurally below the volcanic rocks, there is a thick sedimentary sequence of schists, the Furulund Group, which contains fossils of Upper Ordovician to Lower Silurian age (Spjeldnæs 1985). The whole rock package has been folded isoclinally, leading to a large-scale repetition of sedimentary and volcanic units. This also means that the ore units are repeated (Cook et al. 1990). The volcanic pile is divided into several units, and the sulphide deposits are found at different levels within these units. The deposits are further divided into a Southern and a Northern Ore Field. The Jakobsbakken, Sagmo and Anna deposits are in the southern part of the ore field. The Jakobsbakken deposit is the most zinc-rich of the deposits, containing 4.5 Mt of ore with 1.55 % Cu and 2.42 % Zn. It also is at a structurally lower position than the other two main deposits in the Southern Ore Field, closer to the underlying Furulund Schist. Most of the deposits are in the Northern Ore Field. The Ny-Sulitjelma and Bursi deposits are the structurally the lowest in this ore field, and are situated between overlying metabasalts of the so-called Giken Amphibolite Unit and the Furulund Schist (Cook et al. 1990). Structurally higher up in the Giken Amphibolite Unit is the Hankabakken–Palmberg ore zone. The largest of the deposits in the Sulitjelma field, Giken, is situated structurally above the Giken Amphibolite Unit and below a schist unit (the Leirelva Schist) equivalent to the Furulund Schist. The Giken deposit contained 10.5 Mt of ore, of which 5.8 Mt was mined, containing 2.25 % Cu and 0.7 % Zn. Further up structurally is the Charlotta deposit, which is located at the contact between the Leirelva Schist and the Lower Amphibolite Unit. It is possible that this is the same level as the Sagmo deposit in the Southern Ore Field. The Mons Petter deposit is the structurally highest ore zone in the Northern Ore Field, and is situated between the Lower and Middle Amphibolite Unit. The westernmost, small Furuhaugen deposit (0.52 Mt) has an uncertain structural position, but is possibly the highest deposit in the stratigraphy. Polyphase deformation with a high degree of folding and amphibolite-grade metamorphism has obliterated most primary textures and mineralogical zonation patterns in the Sulitjelma Ore Field. However, several of the deposits are underlain by alteration zones, and display zonation in base metals in accordance with classical VMS type deposits (Cook et al. 1990). References Boyle, A.P. 1989: The geochemistry of the Sulitjelma ophiolite and associated basic volcanics: Tectonic implications. in Gayer, R.A. (ed.): The Caledonide geology of Scandinavia, London, Graham and Trottman, p. 153–163. Cook, N.J., Halls, C. & Kaspersen, P. 1990: The geology of the Sulitjelma ore field, Northern Norway – some new interpretations. Economic Geology, vol. 85, 1720–1737. Grenne, T., Ihlen, P. M. & Vokes, F. M. 1999: Scandinavian Caledonide metallogeny in a plate tectonic perspective. Mineralium Deposita, v. 34, p. 422–471. Pedersen, R.B., Furnes, H. & Dunning, G. 1991: A U/Pb age for the Sulitjelma Gabbro, north Norway: Further evidence for the development of a Caledonian marginal basin in Ashgill–Llandovery time. Geological Magazine, vol. 128, p. 141–153. Spjeldnæs, N. 1985: Biostratigraphy of the Scandinavian Caledonides. In Gee, D.G. and Sturt, B.A. (eds.): The Caledonide orogen – Scandinavia and related areas. Wiley, Chichester, p.317–329.
Free text
The Jakobsbakken deposit is the most zinc-rich of the deposits, containing 4.5 Mt of ore with 1.55 % Cu and 2.42 % Zn. It also is at a structurally lower position than the other two main deposits (Sagmo and Anna) in the Southern Ore Field, closer to the underlying Furulund Schist. The Anna deposit, c. 1 km to the south of Jakobsbakken produced 0.29 mill. t. of copper-ore (3.86 % Cu) in the period 1908-1923.

Photo(s) from the Deposit area:
Photo no. 1 showing Jakobsbakken med bygninger og gruvetipp."

Bibliography:
From NGU's Reference Archive:
Boyle, A.P.; Hansen, T.S.; Mason, R.; , 1985
A new tectonic perspective of the Sulitjelma Region. I The Caledonide Orogen - Scandinavia and Related Areas, Red: D.G. Gee & B.A. Sturt
;John Wiley & Sons Ltd;ARTIKKEL;531-542 pages

Cook, N. , 1996
Mineralogy of the sulphide deposits at Sulitjelma, northern Norway
;ARTIKKEL;Ore geology reviews; No.11;303-338 pages

Sulitjelma gruber. Oversiktskart over feltet
;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 1205

Singsaas, Per , 1963
Elektromagnetiske borhullsmålinger Jakobsbakken synk/Sulitjelma.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.386 A;4 pages

Kollung, Sigbjørn , 1989
Sulitjelmafeltet. Berggrunnsgeologisk kart - M 1 : 100 000. Beskrivelse.
;Norges geologiske undersøkelse;BOK; KARTBESKRIVELSE;Skrifter; No.93;1 - 47 pages
Abstract:
The eugeoclinal rocks of the Sulitjelma region occup a large depression in the Norwegian Caldonodrd betwwen the Nasafjell tectonic window of Precambrian rocks in the south and the Tysfjord window in the north. The age of the rocks is thought to be Cambro-Silurian. The regionl metamophism is mainly in greenschist facies in the lower units, amphibolite facies in the Gasak Nappe and greenschist to amphibolite facies in the Fauske Nappe. Some of the largest sulphide deposits in Norway are located near Sulitjelma. The different types of mineralizations occurring in the region are briefly described.

Kollung, S. , 1986
Sulitjelma. Berggrunnskart; Sulitjelma; 21292; 1:50 000; trykt i farger;
;Norges geologiske undersøkelse;KART

Krog, Jan Reidar; Næss, Gunnar , 1987
Geokjemiske undersøkelser av bekkesedimenter i Sulitjelma-området.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.86.047;59 pages
Abstract:
Bekkesedimenter fra 334 prøvelokaliteter i Sulitjelma-området ble innsamlet med en prøvetetthet på 1 prøve pr. 10 km2. Rapporten inneholder tabeller og resultkart over 28 elementer oppsluttet med HNO3 og bestemt med ICAP.

Singsaas, Per , 1963
Geofysisk undersøkelse Jakobsbakken/Sulitjelma.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.386;9 pages

Fieldsamples
Sample No. Sample type Miscellanrous
NO0517.03 Dump
Sampler: Furuhaug, L./...Stored: Løkken
Comment: Grovk. py-sl i q-ser.sk.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Skjerp 1
(Object Id: 3227 28,01,00)

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543680 m. North: 7443500 m.
Longitude: 16.0061790 Latitude: 67.1055510
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn Cu Kis
Resources and production
Activity: Test mining Reserves:
Operating method: Underground mining Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
NO0517.01 Dump
Sampler: Furuhaug, L./...Stored: Løkken
Comment: Massiv po-cpy-malm fra skeidehaug.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Baches stoll
(Object Id: 3228 28,02,00)

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543480 m. North: 7443050 m.
Longitude: 16.0014060 Latitude: 67.1015440
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Zn Cu Kis
Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
NO0517.02 Dump
Sampler: Furuhaug, L./...Stored: Løkken
Comment: ~ Massiv py-cpy-malm.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 1841 - 028 Jakobsbakken

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)
Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Ag* Au#
NO0517.01 Dump 13610 585 12 613 112 5.9 34.0
NO0517.02 Dump 75233 2648 24 144 39 16.7 12.0
NO0517.03 Dump 25465 8328 331 345 25 20.1 1469.0
------------------
Sample No. Pt# Pd# Rh# As* Cd* Ba* Mo* Sb* Bi*
NO0517.01 -3.0 4.0 -5.0 33 -.2 68 16.00 -2 29
NO0517.02 -3.0 -3.0 -5.0 10 10.0 69 26.00 -2 22
NO0517.03 -3.0 -3.0 -5.0 827 24.0 13 5.00 20 8
------------------
Sample No. S% V* Cr* Mn* Fe% Th* U* W* Sr*
NO0517.01 28.64 1 3 -2 37.78 3.00 -5.00 -2 2.0
NO0517.02 18.98 59 39 231 23.11 3.00 9.00 -2 2.0
NO0517.03 40.14 3 16 33 23.04 -2.00 -5.00 -2 1.0
------------------
Sample No. La* B*
NO0517.01 9.00 10
NO0517.02 10.00 -3
NO0517.03 1.00 3


The fact sheet was created on 24.10.2021

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