(Last updated: 27.04.2007)
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Norsk versjon | ||||
| THE INDUSTRIAL MINERAL DATABASE | |||||
| Occurence 4626 - 301 Tælavåg | |||||
| (Object Id: 7934) (Last updated: 27.04.2007) |
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| Location |
| County: | Vestland | Municipality: | Øygarden (4626) |
| Map 1:50000: | Fjell (1115-4) | Map 1:250000: | Bergen |
| Coordinate system: | EU89-UTM Zone 32 | (Coordinates NOT confirmed) |
| East: | 277017 m. | North: | 6686692 m. |
| Longitude: | 4.9694930 | Latitude: | 60.2556080 |
| Show on map |
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| Resource |
| Resource Type: | Feldspar | Resource Subtype: | Pegmatitic feldspar |
| Importance |
| Raw material meaning: | Little Importance (reg. 18.02.2015) |
| Resources and production |
| Activity: | Mining | Reserves: | ||
| Operating method: | Open pit and underground mining | Historical production: |
Mineralization |
| Genesis: | Form: | |||
| Main texture: | Min. distribution: |
| Main grain size: |
| Strike/Dip: | Direction: | |||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Period: |
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| Igneous complex: |
| Group: | Formation: |
Information(s) in free text format |
| Free text |
| Two granitic K-feldspar-dominated pegmatites occur 1.5 km SW of the village Tælavåg at a peninsula belonging to the Sotra island. The larger pegmatite of ca. 100 m length and 8 to 10 m width occurs ca. 200 m W of the Øvretveit camping site. The pegmatite lens dips 5 to 20° northward. K-feldspar was mined partially underground (Tælavåg Stollen) at the eastern part of the pegmatite. The Tælavåg Stollen forms a water-filled stope about 10x10x5 m in size. The megacrystic K-feldspar is crosscut by irregular quartz veins which up to 2 m in thickness and up to 20 m long. The quartz is milky in the vein centre and becomes smoky towards the margin at the contact with K-feldspar. The pegmatite of the Tælavåg Stollen was mined between 1867 and 1930 for K-feldspar and quartz. The raw material was exported to Holland and United Kingdom for china clay production. A similar but smaller pegmatite occurs next to Øvretveit camping site. The E-W striking, 25 m long and 6 m wide quarry within this pegmatite is hosted in metagabbro. The K-feldspar-rich pegmatite contains irregular veins of smoky quartz. The approximately volume ratio of K-feldspar : quartz in the quarry is 1 : 1. The pegmatite is 50 m long and 15 m wide. Megacrystic biotite (2 x 5 x 5 cm) is common at the western end of the pegmatite. The biotite crystals are aligned in E-W direction which corresponds the striking of the pegmatite. The pegmatite body dips 5 to 20° northward. The Tælavåg pegmatite contains K-feldspar with high K2O concentration of 14.2 wt.% which represents good economic quality but the K-feldspar resources of both pegmatites are more or less exploited. The Lokøyna and Tælavåg pegmatites contain quartz of medium to high quality (5-9 ppm Al, 3-7 ppm Ti, 4-10 ppm Li). At least 5000 tons resources of medium to high purity quartz are left at the Tælavåg Stollen pegmatite, which could be of minor economic interest. There is the possibility that similar pegmatite may occur under the surface in this area. |
| Photo(s) from the Deposit area: |
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Fieldsamples |
| Sample No. | Sample type | Miscellanrous | |||||
| 2508503 | Bedrock |
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| 2508503b | Bedrock |
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| 2508503k | Bedrock |
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| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 4626 - 301 Tælavåg |
Element analyses |
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.) |
| Sample No. | Sample Type | Cu* | Zn* | Pb* | Co* | Ni* | As* | Ba* |
| 2508503b | Bedrock | -10 | 524 | 28 | 52 | 32 | -5 | 24 |
| 2508503k | Bedrock | -10 | 8 | 116 | -5 | -5 | -5 | 326 |
| ------------------ |
| Sample No. | Mo* | Sn* | Sb* | Ga* | V* | Cr* | Th* | U* | W* |
| 2508503b | 16.00 | 51 | 17 | 65.00 | 391 | 40 | 13.00 | 22.00 | -10 |
| 2508503k | -5.00 | -10 | -10 | -10.00 | -10 | -10 | 7.00 | -10.00 | -10 |
| ------------------ |
| Sample No. | Rb* | Sr* | Y* | Zr* | Nb* | Ta* | Cs* | La* | Ce* |
| 2508503b | 3836.0 | 6.0 | -5.0 | -5 | 261.00 | 71.00 | 411.00 | -10.00 | -10.00 |
| 2508503k | 1026.0 | 83.0 | -5.0 | 7 | -5.00 | -10.00 | 17.00 | -10.00 | -10.00 |
| ------------------ |
| Sample No. | Pr* | Nd* | Yb* | Sc* | Hf* | ||||
| 2508503b | -10.00 | -10.00 | 35.00 | 63.00 | -10.00 | ||||
| 2508503k | -10.00 | -10.00 | -15.00 | -10.00 | -10.00 |
Mineral analyses |
( All values are in ppm. Negative values means below detection limit value.) |
| Sample No. | Sample Type | Mineral | Li | Be | B |
| 2508503 | Bedrock | Quartz | 4.600 | -.100 | 1.100 |
| 2508503 | Bedrock | Quartz | 4.900 | -.100 | 1.500 |
| ------------------ |
| Sample No. | Na | Al | P | K | Ti | Fe | Ge | ||
| 2508503 | -22.000 | 4.900 | -6.000 | -1.400 | 3.200 | -.300 | 1.600 | ||
| 2508503 | -22.000 | 5.200 | 7.600 | -1.400 | 3.400 | .300 | 1.600 |
Oxide analyses |
( All values are in % ) |
| Sample No. | Sample Type | SiO2 | Al2O3 | TiO2 | Fe2O3 | MnO | MgO | CaO |
| 2508503b | Bedrock | 36.49 | 15.26 | 2.70 | 23.74 | 0.45 | 8.74 | 0.05 |
| 2508503k | Bedrock | 64.75 | 18.48 | 0.02 | 0.08 | -0.01 | 0.03 | 0.07 |
| ------------------ |
| Sample No. | Na2O | K2O | P2O5 | Loss | Sum | ||||
| 2508503b | 0.00 | 8.69 | 0.01 | 1.02 | 97.00 | ||||
| 2508503k | 1.48 | 14.19 | 0.01 | 0.16 | 99.00 |
| The fact sheet was created on 24.04.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |