Bjerkreim- Sokndal
Ilmenite-apatite-magnetite deposits
Rogaland
CountyThe deposits of apatite + ilmenite + magnetite constitute a 273 million tons probable resource (calculation based on density 3 g/cm2 and to a depth of 100 m) and cover an area 91 million m2. In comparison, the ilmenite mine at Tellnes further south in the province has a reserve of 400 million tons of ore. The average amounts of the three minerals in the Bjerkreim-lobe deposits are: apatite 8.5%, ilmenite 13 % and magnetite 8%, giving a total of almost 30%. At Tellnes the average amount of ilmenite totals 30% in the ore with an additional few % of magnetite and sulphides. We refer to the table below for more details on the individual zones in the Bjerkreim-lobe.
| Average amounts and mineral compositions i %: | ||||
| Zone A | Zone B | Zone C | ||
| Ilmenite | TiO2 whole rock | 7,3 | 6,1 | 5,9 |
| Amounts* | 14,6 | 12,1 | 11,9 | |
| MgO-content in ilmenite | 1,7 | 1,8 | 1,1 | |
| Apatite | P2O5 whole rock | 3,3 | 3,2 | 4,0 |
| Amounts* | 8,3 | 8,0 | 9,8 | |
| Magnetite | Amounts* | 10,2 | 7,4 | 7,1 |
| V2O3-content in magnetite | 0,92 | 0,96 | 0,90 | |
| Total amount | Apatite + ilmenite + magnetite | 33,0 | 27,4 | 28,8 |
| Size of zones | m3 (millions) | 16 | 33 | 42 |
| Tons (millions) Based on 3.0 g/cm3, calculated |
48 | 99 | 126 | |
| * The amount of each mineral is estimated from normative calculations based on whole rock XRF analyses. | ||||
Logistics
There are three discharge harbours in the province to serve the comprehensive mining activity at Tellnes and the aggregate production at Hellvik and Rekefjord,. The distance from the Hellvik discharge harbour for white anorthosite to the nearest deposits in the Bjerkreim-Sokndal intrusion is no more than 20 km by road. The most remote location is 30 km (in a straight line) from the mine at Tellnes. From Tellnes refined ore is transported to the shipping harbour at Jøssingfjord. The railroad connecting Stavanger with Oslo virtually runs within and parallel to the Zone C deposit and crosses the Zone B deposit at Helleland. The discharge harbour at Hellvik is situated less than 1 km from this railroad. All parts of the deposits are easy accessible by roads or tracks and most sequences are relatively well exposed with only minor cover and vegetation. Most low-lying areas are snow-free during winters.
Analysis and calculations
In this part of the presentation you can study the compiled profiles either for the entire zones (mineral for mineral) or combined plots of whole rock normative amounts and mineral compositions for each locality. The average normative amounts are calculated for each profile and/or zone. Data for the mineral concentrates can also be found here.
| Zones of interest | Localities | Mineral concentrates |
|---|---|---|
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Ilmenite-apatite-magnetite deposits