1959 to 1962
The iron mineralisation is associated with in a zone of calc-silicates and this zone was mapped over a 5km strike length that is 200-300m wide in the north where it dips steeply and up to 1km wide in the south where it dips shallowly.
The primary iron mineralisation occurs as magnetite concentrations. Trench and pit sampling demonstrated that the high grade mineralisation (>50% Fe) occurs in the surficial materials and in the enriched primary zones.
Geological mapping, geophysical surveying, trenching (4000m), pitting (564 pits for 1,862m), drilling (22 holes aggregating 572m), petrology and geochemical analysis (2,581 samples).
1976 to 1978
Defined a series of elongate primary mineralised bands (>20% Fe) within the calc-silicate zone. Re-calculated the mineralisation inventory over the 5km strike length and stated a potential resource estimated at +150Mt.
Defined a magnetic/radiometric anomaly coincident with the 5km strike length of iron mineralisation.
2004 - 2006
Infilled BRGM pitting so that the 5km strike length was sampled with ~100m spaced lines, additional geological mapping and sampling, re-evaluated the BRGM studies and calculated a revised mineralisation inventory.
Demonstrated a gravity anomaly associated with the iron mineralisation.
2005 to 2010
Demonstrated that the 5km calc-silicate zone coincides with a prominent geophysical anomaly comprising coincident magnetic and gravity highs.
Confirmed the presence of high grade Fe mineralisation over the 5km zone by assaying 118 rock samples that averaged 66.7% Fe, 1.5% SiO2, 1.0% Al2O3 and 0.075% P.
World Bank funded airborne magnetic and radiometric survey with 500m line spacing.
Indian Pacific Resources
BRGM and UNDP evaluation of the surficial deposits was extensive and meticulous and, if the data were “modern”, would be sufficient to define at least an Inferred Mineral Resource and WAI suggests that it may be conservative.
Should the potentially economic BIF be shown to extend to a depth of 100m, the primary mineralisation could contain >100Mt magnetite BIF.
Undertook ground magnetic, gravity and ground penetrating radar surveys.
Wardell Armstrong International
Reprocessed the geophysical data and historic geological maps sampling data into digital formats.
Collected 118 rock chip verification samples over the 5km iron mineralisation strike length.
Reviewed the previous work, undertook a site visit and compiled the May 2017 Competent Person Report.