AFRICA - Kromdraai Fluorspar Mine
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Kromdraai Fluorspar Mine
Site name Kromdraai Fluorspar Mine
Major commodities Fluorine-Fluorite
Trace commodities Iron, Manganese
Ore minerals/materials Fluorite
Other
minerals/materials Hematite
Country South Africa
Latitude -25.25
Longitude
28.3
THE KROMDRAAI – NAAUWPOORT FLUORSPAR PROJECT LOCATION AND HISTORY
The Kromdraai 209 JR and Naauwpoort 208 JR properties are situated some 80 kilometers north of Pretoria and 3 kilometers directly south of the Vergenoeg Fluorspar Mine. The Vergenoeg Mine has been worked for many years by the Bayer Chemical Group and latterly by the mid-tier South African mining company, Metorex. The Mine comprises a deep open pit into a highly ferruginous breccia pipe containing fluorspar grades of between 20 and 40% CaF2. The fluorspar mineralization on the Sephaku properties has been known previously and explored by Gold Fields of South Africa in 1969-1971 and more recently by BHP Billiton and Sephaku. The Naauwpoort property is the subject of an agreement with BHP, the current prospecting right holder, while the Kromdraai prospecting right is held 100% by Sephaku. Historical drilling and the latest Sephaku boreholes together comprise a data set of 173 boreholes. A recent Mineral Resource Estimate by SRK Consulting has stated an Indicated Fluorspar Resource to the open-pittable portion of the outwash fan deposit on the southern portion of Kromdraai and the northern portion of Naauwpoort.
THE GEOLOGY AND MINERALISATION: * The Outwash Fan Deposit: The fluorspar mineralization occurs as a layer within the ferruginous conglomerates and breccias delineated by drilling. The thickness of the fluorspar layer varies between 1 and 9.5 meters and averages 4 meters. The layer dips to the east at between 7 and 15 degrees. A total of 159 boreholes have been drilled into this fan. * The Channel Lag Deposit: A horizontal fluorspar bearing ferruginous breccia has been mapped and drilled by Sephaku at the northern portion of Kromdraai towards the Vergenoeg Mine.This deposit occurs across an elevated hill formed as a large erosional remnant. This mineralization is of very high grade and is some 400 meters by 200 meters in extent and averages 17 meters thick. Sephaku have drilled 14 boreholes into this deposit.
THE RESOURCE In both the areas the ore will be won cheaply as they both are parallel to the dip slope of the topography at surface. SRK Consultants have completed a Mineral Resource statement on the Outwash Fan deposit and conclude that the drilling, sampling and logging procedure practiced by Sephaku to be of industry standard and the twinning of Gold Fields boreholes by BHP allows the inclusion of the Gold Fields drilling to the Mineral Resource Estimate. SRK further concludes that the geological model proposed for the Outwash Fan is credible. SRK consider a classification of the Resource here as “Indicated”. The Indicated Resource for the Outwash fan at a cut off grade of 15% fluorspar as of June 2008 and at a Density of 3.83 t/m3 is stated by SRK at 8.128 million tons at an average grade of 24.6% CaF2 with a contained CaF2 amount of 2.01milion tons. SRK comment that, with further control of the assay laboratory results as they relate to the analysis of the standard test samples, the classification of the Resources into the measured category would be possible. The Channel Lag deposit in the north of Kromdraai computes to a Geological Resource Estimate of approximately 5 million tons at an approximate average grade of 40% CaF2. This much higher grade will make the probability of blending the Project planned plant feedstock at high grade.
METALLURGY: Gold Fields undertook a considerable amount of metallurgical test work on the Naauwpoort mineralization in 1969 and achieved a +96% CaF2 product and concluded that with further testing that the achievement of a 97% Acid Grade product was possible. Sephaku are planning an meaningful amount of test work from present bulk sampling.
INFRASTRUCTURE: The project area lies on good black top roads just off the M1 North highway some 80 kilometers north of Pretoria and is close to a rail siding at Pienaars river and to water from the Rust der Winter dam Electrical reticulation is available close to the Vergenoeg Mine.
références : http://www.sephakuholdings.co.za/projfluorspar.html
