(Last updated: 19.03.2024)
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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit 1832 - 012 Bleikvassli | |||||
| (Object Id: 2825) (Last updated: 19.03.2024) |
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| Location |
| County: | Nordland | Municipality: | Hemnes (1832) |
| Map 1:50000: | Røssvatnet (1926-1) | Map 1:250000: | Mosjøen |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 448946 m. | North: | 7311810 m. |
| Longitude: | 13.8784700 | Latitude: | 65.9232420 |
| Show on map |
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| Resource |
| Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Zinc | |
| Element(s): | Zn Pb Kis Cu Ag |
| Importance |
| Raw material meaning: | Regional Importance (reg. 28.05.2015) |
| Resources and production |
| Activity: | Mining | Reserves: | 1000 thousand tons | |
| Operating method: | Open pit and underground mining | Historical production: | 4840 thousand tons |
Products |
| Element/product | Crude ore grade or quality | Reg. date | |
| Ag | 25 g/t | 10.12.1999 | |
| Cu | 0.15 % | 10.12.1999 | |
| Pb | 2 % | 10.12.1999 | |
| Zn | 4.0 % | 10.12.1999 |
Operations |
| From - To | Activity | Comments | |
| 1916 - 1916 | Pitting | Company/Institution :Hans Ro | |
| 1941 - 1943 | Test mining | Company/Institution :AS Bleikvassli gruber | |
| 1950 - 1973 | Regular production | Company/Institution :AS Bleikvassli gruber | |
| 1973 - 1993 | Regular production | Company/Institution :AS Sydvaranger | |
| 1993 - 1997 | Regular production | Company/Institution :AS Bleikvassli gruber | |
| 1997 - 1998 | Core drilling | Company/Institution :NGU | |
| 1998 - 1998 | Core drilling | Company/Institution :GeoDrilling |
Mineralization |
| Era: | Proterozoic | Period: | Neoproterozoic | |
| Dating: | 590 (-10\+10) million year | Method: | Rb/Sr | |
| Genesis: | Volcex | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Semi-massive (20-50 % ore minerals) |
| Main grain size: | Medium grained (1-3 mm) | Main alteration: | Sericitisation |
| Strike/Dip: | 210 / 50 | Direction: | 205 | |
| Plunge: | 30 |
| Stratigraphic classification of host rock |
| Era: | Proterozoic | Period: | Neoproterozoic |
| Province: | Caledonides | |
| Geotec.unit: | Rødingsfjell Nappe Complex | |
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Kongsfjell | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Phlogopite | Major mineral (>10%) | |
| Gangue mineral | Muscovite | Major mineral (>10%) | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Feldspar | Subordinate mineral (1-10%) | |
| Gangue mineral | Chlorite | Subordinate mineral (1-10%) | |
| Gangue mineral | Carbonate | Subordinate mineral (1-10%) | |
| Gangue mineral | Epidote | Accessory mineral (<1%) | |
| Gangue mineral | Staurolite | Accessory mineral (<1%) | |
| Gangue mineral | Apatite | Accessory mineral (<1%) | |
| Gangue mineral | Tourmaline | Accessory mineral (<1%) | |
| Ore mineral | Galena | Major mineral (>10%) | |
| Ore mineral | Sphalerite | Major mineral (>10%) | |
| Ore mineral | Pyrrhotite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Major mineral (>10%) | |
| Ore mineral | Chalcopyrite | Subordinate mineral (1-10%) | |
| Ore mineral | Silver | Accessory mineral (<1%) | |
| Ore mineral | Dufrenoysite | Accessory mineral (<1%) | |
| Ore mineral | Hematite | Accessory mineral (<1%) | |
| Ore mineral | Ilmenite | Accessory mineral (<1%) | |
| Ore mineral | Rutile | Accessory mineral (<1%) | |
| Ore mineral | Argentite | Accessory mineral (<1%) | |
| Ore mineral | Valleriite | Accessory mineral (<1%) | |
| Ore mineral | Sternbergite | Accessory mineral (<1%) | |
| Ore mineral | Ottemannite | Accessory mineral (<1%) | |
| Ore mineral | Gahnite | Accessory mineral (<1%) | |
| Ore mineral | Jordanite | Accessory mineral (<1%) | |
| Ore mineral | Freibergite | Accessory mineral (<1%) | |
| Ore mineral | Seligmannite | Accessory mineral (<1%) | |
| Ore mineral | Stromeyerite | Accessory mineral (<1%) | |
| Ore mineral | McKinstryite | Accessory mineral (<1%) | |
| Ore mineral | Gudmundite | Accessory mineral (<1%) | |
| Ore mineral | Kesterite | Accessory mineral (<1%) | |
| Ore mineral | Electrum | Accessory mineral (<1%) | |
| Ore mineral | Antimony | Accessory mineral (<1%) | |
| Ore mineral | Allargentum | Accessory mineral (<1%) | |
| Ore mineral | Arsenic | Accessory mineral (<1%) | |
| Ore mineral | Breithauptite | Accessory mineral (<1%) | |
| Ore mineral | Cernyite | Accessory mineral (<1%) | |
| Ore mineral | Dyscrasite | Accessory mineral (<1%) | |
| Ore mineral | Herzenbergite | Accessory mineral (<1%) | |
| Ore mineral | Jalpaite | Accessory mineral (<1%) | |
| Ore mineral | Meneghinite | Accessory mineral (<1%) | |
| Ore mineral | Gold | Accessory mineral (<1%) | |
| Ore mineral | Bismuth | Accessory mineral (<1%) | |
| Ore mineral | Stannite | Accessory mineral (<1%) | |
| Ore mineral | Pyrargyrite | Accessory mineral (<1%) | |
| Ore mineral | Jamesonite | Accessory mineral (<1%) | |
| Ore mineral | Boulangerite | Accessory mineral (<1%) | |
| Ore mineral | Bournonite | Accessory mineral (<1%) | |
| Ore mineral | Tennantite | Accessory mineral (<1%) | |
| Ore mineral | Chalcocite | Accessory mineral (<1%) | |
| Ore mineral | Bornite | Accessory mineral (<1%) | |
| Ore mineral | Marcasite | Accessory mineral (<1%) | |
| Ore mineral | Tetrahedrite | Accessory mineral (<1%) | |
| Ore mineral | Cassiterite | Accessory mineral (<1%) | |
| Ore mineral | Molybdenite | Accessory mineral (<1%) | |
| Ore mineral | Arsenopyrite | Accessory mineral (<1%) | |
| Ore mineral | Magnetite | Accessory mineral (<1%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Garnet-mica schist | Sedimentary Original rock :Greywacke |
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| Metamorphic facies :Amphibolite | |||
| Host rock | Microcline gneiss | Intrusive Original rock :Alkali syenite |
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| 481 (-2\+2) mill. years;..Method:U/Pb | |||
| Metamorphic facies :Amphibolite | |||
| Host rock | Kyanite schist | ||
| Metamorphic facies :Amphibolite | |||
| Host rock | Quartz-feldspar schist | Extrusive Original rock :Dacite |
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| Metamorphic facies :Amphibolite | |||
| Host rock | Graphite schist | Sedimentary | |
| Metamorphic facies :Amphibolite | |||
| Wall rock | Quartzite | ||
| Metamorphic facies :Amphibolite | |||
| Wall rock | Muscovite schist | ||
| Metamorphic facies :Amphibolite |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Foliation | Strike/Dip :230 / 40 | Post-mineralisation ;...Effect :Controls | |
| Host rock | Fold axis | Dir./Plunge :205 / 25 | Post-mineralisation ;...Effect :Controls |
Information(s) in free text format |
| Free text |
| The sediment-hosted Bleikvassli deposit produced c. 5.0 Mt of ore grading about 0.15 % Cu, 4.0 % Zn, 2 % Pb, and 25 g/t Ag in the period 1957-1997. Structurally below the deposit is a thick and laterally persistent unit of amphibolite, a large gabbroic sill or a massive volcanic flow. Some of the quartz-feldspar gneisses represent felsic volcanics, including the units associated with the deposit. The ore body consists of a discontinuous layer of massive, semi-massive and disseminated sulphides, is more than 1500 m long, up to 300 m wide and up to 20 m thick in fold hinges. In-situ values based on more than 1400 drill-hole analyses are 0.27 % Cu, 5.17 % Zn, 2.72 % Pb, 45 g/t Ag and 0.21 g/t Au. The average iron content is 16.9 %, showing that it is a semi-massive ore body. Three types of sulphide ore are recognized in the Bleikvassli deposit: 1) massive pyrite ore, 2) massive pyrrhotite ore and 3) mobilisate-type veins and veinlets, mainly in the wallrocks. The mobilisates are enriched in galena, chalcopyrite, sulphosalts, silver and gold. It has been suggested that the observed unconformity between the Kongsfjell and Anders Larsa Groups represented a pathway for both the volcanics and the hydrothermal solutions forming the Bleikvassli deposit. |
Bibliography: |
| From NGU's Reference Archive: |
| Kruse, Aart , 1977 |
| Diamantborhullene 1-4/75 på anomali 1, A/S Bleikvassli Gruber. |
| ;Norges geologiske undersøkelse;TEKNISK RAPPORT;Bergarkivet; No.BA 6575;1+bilag pages |
| Abstract: | |
| Anomali 1, som ligger N-for hovedforekomsten ble funnet i 1973. Diamantboring i 1974 påviste malm med drivverdige mektigheter og gehalter. Dermed startet en systematisk oppboring av denne malmen. Diamantboringene fortsatte i 1975 og 1976 og skal også videreføres i 1977. I 1975 ble det boret 3 hull mot de dypere deler av anomali 1 med skjæringer med (den antatte) malmsonen på ca. nivå 180 m.o.h., og 1 hull fra land ytterst i nord med malmskjæring på ca. nivå 300 m.o.h. Unntatt hull 2/75 ble det påtruffet malmmineralisering, men bare i hull 4/75 ytterst i nord drivverdige gehalter og mektighet, (kfr.pro- filene). KONKLUSJON. Anomali 1 - malmens nordgrense er ennå ikke fastlagt. Malmen fortsetter nord for profil oB i Kjøkkenbukta. -Anomali 1 malmen er ikke påvist som drivverdig malm under nivå 280 m.o.h. Selv om det er boret for lite til å kunne fastlegge den drivverdige malmens nedre grense, må den i profil 4 og 6 ligge mellom 200 og 290 m.o.h. Borhull 1/75 i profil 6 med en malm- skering på 0,65 m med 3,5 % Zn på nivå 170 er ikke i strid med en slik mulighet. |
| Bjerkgård, Terje , 1998 |
| Metal and mineral distribution in the Bleikvassli Zn-Pb deposit, Nordland, Norway |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.98.064;52 pages |
| Abstract: | |
| Studies of metal zonations in the Bleikvassli deposit are important, both for detailed planning of a drilling program and for subsequent interpretations of the results. For this investigation, drillhole data were selected from profiles throughout the deposits at intervals of about 100 meters, except for the old, southern part of the deposit, where all profiles where used because of scarcity of data. The total number of drillcore intersections analysed is 461 and is composed of 1437 individual analyses, representing 1953 meters of drillcore. The data has been weighted according to the lengths of the analyzed intervals and average of each ore intersection have been calculated. This study show the presence of a pronounced metal zonation in the deposit, with enrichment of copper in the deeper, central part of the deposit, whereas zinc and lead are relatively enriched towards the upper and more northern part of the deposit. This zonation accords with a mineralogical zonation: pyrrhotite ore contains chlorite and/or biotite is relatively enriched in copper; pyrite ore contains muscovite and/or biotite, and is relatively enriched in zinc and lead. A strong correlation between zinc and lead shows that no major redistribution and separation of these metals took place during the tectonic events affecting the deposit, and that the large-scale zonation observed are likely to be of primary origin. Silver and lead are highly correlated, support- ing the view of galena as the main silver carrier in the deposit. Manganese, and to some extent barium, are associated with the copperrich part of the deposit. This could be a coincidence, due to a primary enrichment in the sediments. Referring to idealized models for SEDEX type deposits, the pyrrhotite-ore enriched in copper could represent the proximal part of the deposit and the pyrite-ore enriched in zinc would be the more distal part. A |
| Bjerkgård, Terje; Larsen, Rune B.; Marker, Mogens , 1997 |
| Regional setting of the Bleikvassli Zn-Pb deposit in Nordland,Norway |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.433;34-35 pages |
| Cook, Nigel , 1993 |
| Conditions of metamorphism estimated from alteration lithologies and ore at the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway. |
| ;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.73 (4);226-233 pages |
| Abstract: | |
| Electron probe microanalysis of silicate and sulphide phases within ores, of microcline gneiss, garnet-biotite schist and other characteristic alteration assemblages associated with the Belikvassli Zn-Pb-(Cu) massive sulphide orebody were carried out. Using established geothermobarometric methods, peak metamorphic conditions for the portion of the Rødingsfjell Nappe Complex hosting the orebody are estimated. Most methods employed indicate peak conditions in the range 540-570°C and 7.5-8.5 kbar. Only a single metamorphic episode is recorded in the rocks studied here. Geothermometric calibrations based on compositions of garnet-chlorite pairs give temperature conditions of approx. 510-520°C, suggesting temperatures on the retrograde cooling path. Estimates of peak and retrograde metamorphism are consistent with observed mineralogical and textural evidence recorded in the rocks. |
| Dalsegg, Einar , 1999 |
| CP-borhullsmålinger ved Bleikvassli Gruber i 1998, Hemnes, Nordland. |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.004;21 pages |
| Abstract: | |
| For vurdering av mulig gjenåpning av gruva ble det sommeren 1998 utført et omfattende borprogram i Bleikvassli for påvisning av eventuell ny malm langs hovedmalmens vestflanke. NGU fikk i oppgave å teste om en ved bruk av CP-målinger kunne følge mineraliserte nivåer og strukturer fra borhull til borhull, og dermed ha en bedre styring på boringene. I motsetning til tidligere CP-målinger i gruveområdet har årets målinger vist at bruk av CP-målinger gir nyttig tilleggsinformasjon. Selv om boringene ikke påviste nye malmfunn, gav CP-målingene informasjon om utbredelsen av malm- og grafittnivåene i denne delen av gruveområdet. Dette hadde stor betydning, spesielt i forbindelse med hvor langt de negative hullene skulle bores. |
| Dalsegg, Einar , 1999 |
| TFEM-målinger Buktliklubben, Bleikvassli, Hemnes, Nordland |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.003;42 pages |
| Abstract: | |
| Som en del av Norlandsprogrammet undersøkelser tilknyttet gjenåpning av Bleikvassliforekomsten, ble det i 1998 utført TFEM-målinger i et område ved Buktliklubben øst for Bleikvassli Gruber. Hensikten vår å se om geofysiske bakkemålinger kunne føre til påvisning av økonomiske interessante mineraliseringer i dette området som ikke var undersøkt med denne type målinger tidligere. Målingene har innenfor det undersøkte området påvist flere anomalier hvor de aller fleste ser ut til å skyldes grunne ledere. Måledata indikerer at anomaliårsken til de mest markerte sonene skyldes grafitt, og undersøkelsen har ikke ført til indikasjoner som umiddelbart synes å skyldes massive sulfidmineraliseringer av betydning. |
| Elvebakk, Harald; Dalsegg, Einar , 1996 |
| Geofysiske målinger på Kjøkkenbukta, Bleikvassli Gruber, Hemnes, Nordland |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.96.076;64 pages |
| Abstract: | |
| Det er gjort TFEM-målinger på Kjøkkenbukta like nord for Bleikvassli Gruber. Hensikten var å kartlegge en eventuell fortsettelse av Kjøkkenbuktmalmene (linse A og B) østover og utover bukta. Det ble benyttet et måleopplegg hvor energiseringskabelen var fjernet fra måleområdet for om mulig å redusere effekten av kjente, grunne grafittsoner. Resultatene viste at måleopplegget fungerte godt, og grunne, kjente grafitt- soner påvirket ikke målingene. Målingene indikerte en dyp leder med en utstrekning på minst 600 m med et tolket dyp på 100 - 150 m. Lederen har varierende ledningsevne, og bare en del av sonen har ledningsevne tilsvarende malmsonene det ble jordet i. Dette kan tyde på at malmsonen (linse A og B) ikke går vesentlig lenger østover, noe oppfølgende boringer har bekreftet. Målingene indikerte også forbindelsen vestover til Nordmalmen og en mulig fortsettelse av linse A vestover. Det anbefales boring på disse sonene og på dyplederen ute på Kjøkkenbukta. |
| Elvebakk, Harald; Rønning Jan S. , 1998 |
| Sprekkekartlegging med georadar ved Bleikvassli Gruber |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.98.038;12 pages |
| Abstract: | |
| I forbindelse med store setninger i fjellet ved gruveåpningen ved Bleikvassli Gruber er det gjort georadarmålinger for å kartlegge sprekker og sprekkesoner som kan tenkes å ha betydning for arbeidet med å tette fjellet og dermed hindre vanninntrengning i gruva. |
| Grønlie, Gisle , 1975 |
| Gravimetriske målinger ved Bleikvassli Gruver, 30/6-2/7 1975. |
| ;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 6577;3 pages |
| Abstract: | |
| Gravimetriske målinger er utført over 6 VLF-anomalier, hvorav 3 er i relativt nærhet av gruva og 3 er på nordsiden av Kjøkkenbukta. Hensikten med målingene var å prøve å skille ut grafitt-fylitt skifersoner som gir kraftige elektriske og elektromagnetiske anomalier fra andre ledende soner. Forsøk i Bleikvassli i fjor med gravimetriske målinger over den nye malmen og grafittskifre viste at over malmen er det en positiv tyngdeanomali mens grafittskiferen ikke gir noen anomali. Profilene er fra 120 til 240 m lange. Måleavstand er 20 m i utkanten av og 10 m over selve anomalien. Samtidig med de gravimetriske målingene foretok gruvemåler Henriksen høydebestemmelse av målepunktene. Ut fra de gravimetriske målingene peker 4 områder seg ut som interessante. |
| Horvath |
| Bleikvassli Grube Malmkart. Dagåpninger og diamantboringer 1 : 200? |
| ;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 9 |
| Juve, Gunnar , 1961 |
| Bleikvassli grube. Profilskisse av dagbrudd |
| ;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 1790 |
| Moralev, Gleb V.; Bjerkgård, Terje; Larsen, Rune B. , 1997 |
| Geology of the Kjøkkenbukta orebody, Bleikvassli Gruber, Nordland, Norway |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.96.155;33 pages |
| Abstract: | |
| The aim of the present study was to obtain more data regarding geological relations between the massive sulfide ore and wall rock, especially the microcline gneiss, the genesis of which is a subject of discussion. Another objective was to get more data about the distribution of gold in the ore and wall rocks. The choice of mapping target was influenced both by geological relationships and interests of the mining company. Mapping of the mining level 290 meters above sea level (m.a.s.l.) was completed during two weeks in April and May, 1996. Both walls and roof along 190 m of the underground workings were mapped in the scale 1:100. The working face of the drifts and some interesting localities on the walls were mapped in approximately the scale 1:50. The contact between the NNW part of the ore zone in the Kjøkkenbukta ore- body and the microcline gneiss body is discordant and the microcline gneiss is wrapped around the ore zone. The relationship between the microcline gneiss and the surrounding mica schist is complicated by superimposed tectonic events. A single observation of an angular unconformity between the schist and micro- cline gneiss can be interpreted in two ways; either as a primary intrusive, or a tectonic contact. Massive ore and wall rocks in the NNW ore zone have discor- dant relationships to each other, and the ore cuts through schistosity and the hinge zones of small F, folds. This is probably a result of tectonic emplacement of the ore along a shear zone. Microscopic recognizable native gold or electrum have not been found in the massive ore of the Kjøkkenbukta orebody. This is an agreement with previously obtained data for the Bleikvassli deposit in general (Moralev et al., 1995) Native gold and electrum have been found in veinlets of remobilized ore and deposition of gold and electrum can be correla- ted temporally with carbonate-chlorite veinlets. |
| Moralev, Gleb V.; Larsen, Rune B.; Bjerkgård, Terje , 1995 |
| Distribution of precious metals in the Bleikvassli Zn-Pb Sedex type deposit, Nordland, Norway |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.95.154;120 pages |
| Abstract: | |
| In contrast to the volcanic hosted massive sulfide deposits, the presence of recoverable gold is not a common feature of sedex type Pb-Zn deposits. However, the available data suggest that the gold content in the Bleikvassli deposit could be higher than previously assumed. This report comprise the results of field work on the Bleikvassli Pb-Zn deposit, Nordland, Norway. The main goals have been to study the distribution of precious metals in the massive ore in the wall rocks and furthermore to evaluate the mode of occurrence of precious metals. During the field season in 1995, 11 drillholes from profiles 360N, 520N and 700-740N were relogged and sampled in continuous intervals across the ore zone. Five short profiles were also sampled across the massive sulfide body in underground workings. Drill hole intersections, which showed gold and/or silver enrichment during routine analysis by the mining company, were sampled for microscopic and microprobe studies. During the study of gold and silver rich intervals from the drill holes, it was clear that mobilizate type veinlets and disseminated sulfide mineralizations hosted by quartz +- feldpar veins, "quartzite-like" rocks and muscovite schist dominate in the precious metal rich intervals. Until now, 434 samples have been analyzed. |
| Olesen, Odleiv; Rueslåtten, Håkon , 1997 |
| Vurdering av årsak til setninger i Bleikvassli Gruber - delrappport om tilslamming av Kotabekken |
| ;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.97.191;36 pages |
| Abstract: | |
| Bleikvassli Gruber ble den 25.september 1997 utsatt for setninger og vanninn- trenging. Dette resulterte i at gruva ble fylt med vann i løpet av en uke og at en 10 meter høy vannkraftsdam tilhørende Statkraft ble ødelagt. NTNU, NORSAR og NGU har fått i oppgave av Gjensidige Forsikring å vurdere årsakene til setningen i gruva, og spesielt muligheten for at et jordskjelv som er registrert i området kan ha utløst setningen. Denne rapporten utgjør NGU's bidrag til vurderingene. Det vil bli utarbeidet en felles konklusjon fra de tre institusjonene. |
| Ramberg, H. , 1942 |
| Rapport fra Bleikvassli Zn - Pb forekomst. |
| ;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1017;1 pages |
| Abstract: | |
| Kort beskrivelse av Bleikvassli-malmens utgående og omgivende bergarter. Øverst til venste står navn og adresse til Hans Ramberg. Hvorvidt han er forfatter eller mottager av rapporten vites ikke. |
| Stuedahl, H. , 1942 |
| Bleikvassli gruber. Malmkart 1:500 |
| ;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 17 |
| Stuedahl, H. , 1942 |
| Bleikvassli gruber. Topografisk kart 1:2 000. Plankart med stoller og diamantboring |
| ;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 19 |
| Vokes, F.M. , 1962 |
| Contributions to the mineralogy of Norway. No. 15. Gahnite in the Bleikvassli ore. |
| ;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.42 (4);317-329 pages |
| Abstract: | |
| Frie emneord: Gahnitt |
| Vokes, Frank M. , 1960 |
| Contributions to the mineralogy of Norway. No. 7. Cassierite in the Bleikvassli ore. |
| ;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.40 (3-4);193-201 pages |
| Abstract: | |
| Bleikvassli Gruber A/S in Nordland fylke, some 50 kilometres south of Mo i Rana, (Fig.1) is at the present mining about 100,000 tons per year of pyritic lead-zinc ore. Economic products are lead, zinc and pyrite concentrates. During the course of a systematic mineralogical examination of samples of the ore, the writer detected the presence of small, rounded to euhedral grains of a brown mineral in the heaviest, non-magnetic frcations. Optical and x-ray powder determinations proved this mineral to be cassiterite (SnO2)1. Following this, cassiterite was observed and studied in thin sections of the Bleikvassli ore. Colorimetric determinations of the SnO2 content of the ore were also made on more than 30 samples. At the same time, a large sample of the mine tailings was examined mineralogically and chemically. Cassiterite, being non-flotable or nearly so, would not be recovered in any of the concentrates being produced at the mine and would therefore report in the tailings. These are at the present time being allowed to fill up a small lake and thus would be available for re-treatment if the amount of tin in them should prove to be economically recoverable. Frie emneord: Kassiteritt |
| Ramberg, Ivar B. , 1967 |
| Kongsfjell-områdets geologi, en petrografisk og strukturell undersøkelse i Helgeland, Nord-Norge. |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.240;1-152 + k pages |
| Abstract: | |
| The area investigated is situated in the Rødingsfjell nappe of the Norwegian Caledonides in Helgeland, North Norway. The study is divided into two main parts; the first structural and the second petrographic. The first section contains a description of different structural elements and the various mesoscopical and macroscopical structures encountered in each of the structural subareas. It is concluded that at least some parts of the area investigated have suffered three phases of folding. The first (F1) phase produced large-scale and small-scale similar-type folds following both WNW and SSW trending axes. Contemporaneously the western part of the area, the marble-rich Anders Larsa Group was thrust at a low angle to the east over the Kongsfjell Group constituting the complex, transversal Jørentind Synform. During the second phase of folding (F2) the Kongsfjell Group was "wrapped" around the Anders Larsa Group, the latter forming the core of a regional and almost isoclinal fold plunging to the SSW. The effects of the second phase are less evident towards the east. The small-scale second phase folds are more open, assymetric, flexural-slip folds. Both the Anders Larsa and the Kongsfjell Group are overthrust by a nappe in SSW (Tustervann region). During the third deformation the F1 and F2 structures were deformed in the western part of the area. |
| References not to be found in NGU's Reference Archive.: |
| Bjerkgård, T. 1999: Metal distribution and formation of the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway. in Stanley ,C. et. al. Mineral Deposits: processes to processing. Conference Proceedings SGA-IAGOD, London 1999, p.931-934. |
| Cook, N.J., Spry, P.G. & Vokes, F.M. 1999: Mineralogy and textural relationships among sulphosalts and related minerals in the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway. Mineralium Deposita, v.34, p.35-56. |
| Rosenberg, J.L., Spry, P.G., Jacobson, C.E., Cook, N.J. & Vokes, F.M. 1999: Thermobarometry of the Bleikvassli Zn-Pb-(Cu) deposit, Nordland, Norway. Mineralium Deposita, v.34, p.35-56. |
| Skauli, H., 1992: On the formation of Zn-Pb deposits; a case study of the Bleikvassli deposit, Northern Norway. Doctoral thesis, Univ. Oslo, 1992 |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| DH10-96 | Core |
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| DH24-91 | Core |
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| DH24-96 | Core |
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| DH2-90A | Core |
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| DH2-90B | Core |
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| DH2-90C | Core |
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| DH29-96 | Core |
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| DH3-93 | Core |
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| DH5-90 | Core |
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| DH6-94 | Core |
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| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 1832 - 012 Bleikvassli |
Element analyses |
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.) |
| Sample No. | Sample Type | Cu* | Zn* | Pb* | Co* | Ag* | Au# | As* |
| DH10-96 | Core | 3114 | 56525 | 33260 | 26 | 14.6 | 100.0 | 311 |
| DH24-91 | Core | 1318 | 88814 | 34108 | 39 | 77.7 | 134.0 | 50 |
| DH24-96 | Core | 5510 | 49686 | 25930 | 96 | 33.1 | 110.0 | 740 |
| DH2-90A | Core | 3183 | 33501 | 4644 | 1 | 7.7 | 50.0 | 3 |
| DH2-90B | Core | 6392 | 15301 | 7561 | 1 | 11.8 | 144.0 | 7 |
| DH2-90C | Core | 1865 | 58930 | 28954 | 33 | 31.0 | 59.0 | 26 |
| DH29-96 | Core | 5065 | 25617 | 23336 | 112 | 90.0 | 425.0 | 185 |
| DH3-93 | Core | 603 | 19215 | 41354 | 3 | 304.7 | 178.0 | 298 |
| DH5-90 | Core | 904 | 52100 | 10214 | 25 | 7.2 | 41.0 | 37 |
| DH6-94 | Core | 2334 | 18117 | 18471 | 3 | 60.3 | 178.0 | 45 |
| ------------------ |
| Sample No. | Cd* | Ba* | Sb* | Bi* | Mn* | Fe% | |||
| DH10-96 | 181.1 | 17 | 82 | 21 | 704 | 18.53 | |||
| DH24-91 | 284.0 | 11 | 101 | 101 | 200 | 32.16 | |||
| DH24-96 | 206.8 | 38 | 77 | 50 | 669 | 22.03 | |||
| DH2-90A | 136.4 | 79 | 47 | 9 | 676 | 12.37 | |||
| DH2-90B | 49.1 | 181 | 144 | 25 | 437 | 10.65 | |||
| DH2-90C | 199.7 | 104 | 186 | 27 | 620 | 16.76 | |||
| DH29-96 | 138.4 | 27 | 81 | 157 | 734 | 27.90 | |||
| DH3-93 | 81.2 | 5 | 740 | 119 | 403 | 3.12 | |||
| DH5-90 | 157.4 | 95 | 51 | 11 | 532 | 17.42 | |||
| DH6-94 | 48.9 | 19 | 186 | 39 | 356 | 6.92 |
| The fact sheet was created on 26.04.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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