Norsk versjon
THE ORE DATABASE
Occurence 1841 - 017 Bursi
(Object Id: 2633)
(Last updated: 01.06.2015)
Belongs to the Province: Sulitjelma provins
Drill Cores: Bursi

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543533 m. North: 7448446 m.
Longitude: 16.0046460 Latitude: 67.1499390
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis Co
Importance
Raw material meaning: Little Importance (reg. 01.06.2015)

Resources and production
Activity: Mining Reserves: 15 thousand tons
Operating method: Underground mining Historical production: 1830 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Cu 1.50 % 15.05.1993
Kis 12.1 % 15.05.1993
Zn 0.31 % 15.05.1993

Operations
From - To Activity Comments
1902 - 1975 Regular production Company/Institution :Sulitjelma Gruber
1902 - 1985 Geology Company/Institution : " "
1969 - 1975 Core drilling Company/Institution : " "

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form: Layer
Main texture: Breccia cement Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration: Chloritisation
Strike/Dip: 305 / 10 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Seve-Køli Nappe Complex
Tectonic complex: Kølidekkekomplekset
Igneous complex:
Group: Sulitjelmagruppen Formation: Otervassformasjonen

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

Lithology:
Relationship Rock Origin
Host rock Chlorite schist Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite
Wall rock Amphibolite Extrusive
Original rock :Tuff
Metamorphic facies :Amphibolite
Wall rock Garnet mica schist Sedimentary
Original rock :Sandstone
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Fold axis Strike/Dip :100 / 10 Post-mineralisation ;...Effect :Controls

Information(s) in free text format
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 Bursi deposit represent the lowest level of mineralization in the Sulitjelma ore district. The mineralization is a stratabound impregnation in brecciated chlorite schist. Folding in two phases resulted in formation of a dome structure in the otherwise flat-lying deposit. The deposit was mined from 1902 to 1975 and 1.83 mill. t of ore was produced with 1.5 % Cu and 0.31 % Zn. Reserves are estimated to 0.015 mill. t.

Bibliography:
From NGU's Reference Archive:
Singsaas, Per; Brækken, H. , 1942
Elektromagnetiske undersøkelser Furuhaugen Grube - Gjertrudfjell, Bursi Grube - Furulund, Furulundskjerp - Lapphelleren, Fjell grube, Hankabakken grube, Storhaugen skjerp
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.26;23 pages

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

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.

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.

Hansen, Tor Søyland , 1982
En geologisk undersøkelse av Nordgruvefeltet i Sulitjelma
;NTH Bergavd.;AVHANDLING;354 bl. pages
Abstract:
Dr.ing. avh. ved Norges tekniske høgskole, Trondheim, mars 1982

Christoffersen, T.M. , 1960
Malmgeologisk beskrivelse av området Bursi-Charlotta, Sulitjelma.
;NTH Bergavd.;AVHANDLING

Eidsvig, Per , 1973
Måling av oppladet potensial ved Mons Petter og Bursi.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1123;10 pages

Singsaas, Per , 1960
Geofysisk undersøkelse Øst for Bursi Grube/Sulitjelma.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.277;8 pages

References not to be found in NGU's Reference Archive.:
Andersen, M.C. 1985: Revurdering av Bursi-forekomsten. Intern rapp. Sulitjelma Bergverk, 6 sider.

Name of Sample point: Prøvepunkt 1
(Object Id: 4064 17,00,01)

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543383 m. North: 7448396 m.
Longitude: 16.0011660 Latitude: 67.1495120
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis


Fieldsamples
Sample No. Sample type Miscellanrous
NO0504.01 Dump
Sampler: Furuhaug, L./...Stored: Løkken
Comment: Grovk., diss. py-cpy-malm.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt 2
(Object Id: 4065 17,00,02)

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543433 m. North: 7448446 m.
Longitude: 16.0023380 Latitude: 67.1499530
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis


Fieldsamples
Sample No. Sample type Miscellanrous
NO0504.03 Dump
Sampler: Furuhaug, L./...Stored: Løkken
Comment: Grovk., ~ massiv py-cpy-malm.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt 3
(Object Id: 4066 17,00,03)

Location
County: Nordland Municipality: Fauske (1841)
Map 1:50000: Sulitjelma (2129-2) Map 1:250000: Sulitjelma
Coordinate system: EU89-UTM Zone 33
East: 543383 m. North: 7448496 m.
Longitude: 16.0012040 Latitude: 67.1504090
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn Kis


Fieldsamples
Sample No. Sample type Miscellanrous
NO0504.02 Dump
Sampler: Furuhaug, L./...Stored: Løkken
Comment: Grovk., ~ massiv py-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 - 017 Bursi

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#
NO0504.01 Dump 23063 1490 21 295 60 4.2 50.0
NO0504.02 Dump 28812 8059 76 484 98 13.3 612.0
NO0504.03 Dump 95591 13788 348 1007 54 48.7 382.0
------------------
Sample No. Pt# Pd# Rh# As* Cd* Ba* Mo* Sb* Bi*
NO0504.01 -3.0 -3.0 -5.0 27 7.4 16 85.00 -2 -2
NO0504.02 -3.0 -3.0 -5.0 83 24.2 9 32.00 4 -2
NO0504.03 -3.0 -3.0 -5.0 144 40.6 5 7.00 -2 2
------------------
Sample No. S% V* Cr* Mn* Fe% Th* U* W* Sr*
NO0504.01 8.50 114 101 322 17.54 -2.00 -5.00 -2 3.0
NO0504.02 27.51 25 53 203 28.80 -2.00 -5.00 -2 4.0
NO0504.03 42.10 12 13 137 31.10 -2.00 -5.00 3 4.0
------------------
Sample No. La* B*
NO0504.01 6.00 -3
NO0504.02 2.00 -3
NO0504.03 1.00 -3


The fact sheet was created on 18.10.2021

Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2021 Geological Survey of Norway