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English version | ||||
| INDUSTRIMINERALDATABASEN | |||||
| Forekomstområde 1833 - 325 | |||||
| (Sist oppdatert 07.des.2015) | |||||
Navn på deposit area : Altermark |
| (Objekt Id : 1833,325,00,00) |
| Lokalisering |
| Fylke : | Nordland (18) | Kommune : | Rana (1833) |
| Kart 1:50000: | Mo i Rana (1927-1) | Kart 1:250000: | Mo i Rana |
| Markeringspunkt: | Lengdegrad: | 13.9890480 | Breddegrad: | 66.3411030 |
| EU89-UTM Zone 33 | (Coordinates IS confirmed) |
| X-koord: | 454731 m. | Y-koord: | 7358297 m. |
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| Materialtype |
| Hovedtype: | Talk | Subtype: | Talk |
| Production |
| Activity: | Gruvedrift | Reserves: | 916 thousand tons | |
| Prod. method: | Dag- og underjordsdrift | Production: | 1000 thousand tons | |
| Prod. status: | Nedlagt | Volume of dump: | ||
| Resource estimat. standard: | Ikke standardisert |
| Betydning |
| Offentlig: | Regional Importance (reg. 04.09.2015) |
| Economical: | Viktig , (Confirmed 04.sep.2015 by Havard Gautneb) |
| Historical: | Yes , (Confirmed 20.feb.2015 by Havard Gautneb) |
Products |
| Element/product | Crude ore grade or quality | |
| SOA/TA | % |
Ownership |
| Type of ownership | Owner | Land- and title number | |
| Concessionary (Mining rights) | Norwegian Talc Altermark AS |
Operations |
| From - To | Activity | Comments | |
| 1932 | Regular production | Company/Institution :Norwegian Talc Altermark AS | |
| 1991 - 1991 | Geophysics | Company/Institution :NGU | |
| 1991 - 1995 | Detail mapping | Company/Institution :Tor Arne Karlsen | |
| 1994 - 1995 | Geochemistry | Company/Institution :Tor Arne Karlsen |
Mineralization |
| Era: | Paleozoic | Period: | Silurian | |
| Dating: | Method: | |||
| Genesis: | Metasomatisk | Form: | Linse | |
| Main texture: | Strukturløs | Min. distribution: | Massiv |
| Main grain size: | Grovkornet (>3 mm) |
| Strike/Dip: | 45 / 45 | Direction: | 45 | |
| Plunge: | 45 |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Silurian |
| Province: | ||
| Geotec.unit: | ||
| Tectonic complex: | Rødingsfjelldekkekom | |
| Igneous complex: |
| Group: | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Not defined | Talc | Major mineral (>10%) | |
| Not defined | Magnesite | Major mineral (>10%) | |
| Not defined | Chlorite | Subordinate mineral (1-10%) | |
| Not defined | Magnetite | Subordinate mineral (1-10%) |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Host rock | Shear plane | Strike/Dip :45 / 45 | Syn-mineralisation ;...Effect :Modifies | |
| Wall rock | Foliation | Strike/Dip :45 / 45 | Syn-mineralisation ;...Effect :Modifies | |
| Wall rock | Fold axis | Strike/Dip :300 / 10 | Syn-mineralisation ;...Effect :Modifies |
Opplysning(er) i fritekstformat |
| Fri tekst |
| Det drives underjord på en sonert talkrik ultramafitt med serpentinittkjerne. Forekomsten har vært i drift i mange år og driften i dagens gruveområde går mot slutten. Hvithet på gjennomsnittsprøver fra produksjonen er ca 80 %. Magnetitt er da fjernet og malmen er nedmalt. |
Bibliography: |
| From NGU's Reference Archive: |
| Karlsen, Tor Arne , 1995 |
| Geological and geophysical studies of ultramafite associated talc deposits, Altermark, Northern Norway. |
| ;NTH Bergavd.;AVHANDLING |
| Karlsen, Tor Arne ; Rian, Edvin ; Olesen, Odleiv , 2000 |
| Overwiew of talc resources in the Altermark talc province, northern Norway, and possible uses of the talc ore |
| ;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.436;93-102 pages |
| Abstract: | |
| Active prospecting during the past 10 years has proved that the Altermark area contains much more talc than previously recognised in the Nakkan-Esjeklumpen area, 10 M tonnes or more of talc-carbonate ore are probably present, distributed in ultramafic bodies. The ore, which occurs as one of several layers within compositionally zoned ultramafic lenses dominated by antigorite serpentinites, has the following general mineralogy; talc (45-65%), carbonate (30-50%), chlorite (0-4%) and magnetite (0-3%). Relative to other known similar deposits, the ore is rather coarse-grained, and the minerals tend to be idio- blastic. Several products can be made from the talc-carbonate ore. By applying flotation or other kinds of mineral separation techniques, it is likely that high-quality talc-concentrate could be made in addition to calc-carbonate mixtures. a concentrate of by-product breunnerite would possibly be of ecomonic value. |
| Faktaarket ble generert 13.06.2026 |
| Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no |
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