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Sahavaara
Metallurgical Testwork
In early 2007, Northland collected a 2,000 tonne underground bulk sample, a portion of which was analyzed by SGS metallurgical laboratory in Canada. Late in 2007, Corus Group R&D (Netherlands) completed a successful pelletizing test on 2.5 tonnes of iron ore concentrate generated by the bulk sample program. The results demonstrate that the pellets made from the Sahavaara concentrate can fulfill or exceed all of the necessary chemical and physical characteristics of commercial-grade iron ore pellets.
The pellets returned the following chemical analysis:
The pellets were found to be of excellent quality, with high Fe, low SiO2 and Al2O3. In addition, the sulphur analysis was found to be low at 0.008%.
During the 1st quarter 2009 additional metallurgical testing and process development was undertaken at GTK in Finland on drill core samples combined to represent the ore types to be expected across Sahavaara. The testing aimed to see if the levels of Fe could be elevated and the levels of MgO could be reduced, and to provide as improvements to the process conditions by reducing reagent consumption and the time for flotation.
The successful testing produced concentrates with typical assays shown below:-
Additional testwork is contemplated using the improved concentrate quality with higher iron content and lower MgO content, probably blended with similar concentrates from the other NRI projects.
In early 2007, Northland collected a 2,000 tonne underground bulk sample, a portion of which was analyzed by SGS metallurgical laboratory in Canada. Late in 2007, Corus Group R&D (Netherlands) completed a successful pelletizing test on 2.5 tonnes of iron ore concentrate generated by the bulk sample program. The results demonstrate that the pellets made from the Sahavaara concentrate can fulfill or exceed all of the necessary chemical and physical characteristics of commercial-grade iron ore pellets.
The pellets returned the following chemical analysis:
| Element | Fe | Al2O3 | SiO2 | MgO | TiO2 | CaO | MnO |
|---|---|---|---|---|---|---|---|
| Sample 1 | 65.6% | 0.38% | 1.19% | 4.23% | 0.09% | 0.07% | 0.17% |
| Sample 2 | 65.6% | 0.39% | 1.19% | 4.27% | 0.09% | 0.07% | 0.18% |
The pellets were found to be of excellent quality, with high Fe, low SiO2 and Al2O3. In addition, the sulphur analysis was found to be low at 0.008%.
During the 1st quarter 2009 additional metallurgical testing and process development was undertaken at GTK in Finland on drill core samples combined to represent the ore types to be expected across Sahavaara. The testing aimed to see if the levels of Fe could be elevated and the levels of MgO could be reduced, and to provide as improvements to the process conditions by reducing reagent consumption and the time for flotation.
The successful testing produced concentrates with typical assays shown below:-
Element |
Iron Fe |
Alumina Al2O3 |
Silica SiO2 |
Magnesia MgO |
Titanium TiO2 |
Lime CaO |
Manganese MnO |
|---|---|---|---|---|---|---|---|
Concentrate |
69.1% | 0.28% | 0.95% | 2.6% | 0.09% | 0.04% | 0.13% |
Additional testwork is contemplated using the improved concentrate quality with higher iron content and lower MgO content, probably blended with similar concentrates from the other NRI projects.
