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Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 1640 - 032 | |||||
| (Last updated 12.jun.2015) | |||||
Name of Deposit Area : Skardgruva |
| (Object Id : 1640,032,00,00) |
| The deposit area belongs to the Province : Feragen kromfelt |
| Location |
| County : | Sør-Trøndelag (16) | Municipality : | Røros (1640) |
| Map 1:50000: | Brekken (1720-2) | Map 1:250000: | Røros |
| Marking point: | Longitude: | 11.8081660 | Latitude: | 62.5652520 |
| EU89-UTM Zone 32 |
| X-coord: | 644318 m. | Y-coord: | 6940292 m. |
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| Commodity |
| Main Type: | Ferroalloys (Cr,Ni,Co,V,Mo,W) | Sub Type: | Chromium | |
| Element(s): | Cr |
| Production |
| Activity: | Mining | Reserves: | ||
| Prod. method: | Underground mining | Production: | 32,55 thousand tons | |
| Prod. status: | Disused, closed | Volume of dump: |
| Importance |
| Public: | Little Importance (reg. 18.02.2015) |
| Economical: | Minor interest |
Products |
| Element/product | Crude ore grade or quality | |
| CR | 27 % |
Mineralization |
| Era: | Paleozoic | Period: | ||
| Dating: | Method: | |||
| Genesis: | Orthomagmatic formation | Form: | ||
| Main texture: | Min. distribution: |
| Main grain size: | Main alteration: |
| Strike/Dip: | Direction: | |||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: |
| Province: | ||
| Geotec.unit: | ||
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Ore mineral | Chromite | Major mineral (>10%) |
Information(s) in free text format |
| Free text |
| The Feragen chromium ore field is associated with the large bodies of ultramafic rocks, mainly altered to serpentinites, located to the SE of Røros. The main rock types are variably serpentinized dunite and peridotite (cpx-bearing harzburgite to cpx-poor lherzolite). Cr-ores int the form of chromite are exclusively hosted in the dunite. Typical podiform ores predominate, though semi-stratiform ore bodies are also present. Ore-types include fine-grained impregnations, banded and semimassive/massive (> 55% Cr-oxide) types. Generally the chromite-ores have low PGE values (0.1-0.2 ppm), except the Osthammeren deposit, which has an average grade of 1.5 ppm total PGE. Between 1820 and 1940 27 500 – 32 500 t of chromium ore was produced from mainly three mines (Leigh, Ler and Skal mines). |
| The fact sheet was created on 01.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |