South Africa – These results received by Botswana Diamonds were modelled to an estimated grade range of 20 to 270 cpht at a bottom cut-off grade of 0.6 mm, with the largest stone being a white transparent crystal diamond falling in the -1.18+0.85 mm sieve.
The modelling took cognisance of the results from the earlier bulk processing of surface and near surface material. The wide range in the estimated grade reflects the small sample size.
The kimberlite concentrate was recovered from the nine core holes drilled on Frischgewaagt where both magmatic kimberlite (associated with dykes) and volcanoclastic (associated with pipes) were recently discovered.
Johannesburg-based mining consultancy The MSA Group undertook the microdiamonds analyses and the modelling was undertaken by Dr JJ Ferreira, a world renowned expert in micro diamond assessment.
40 km of detailed ground based geophysics is nearing completion on both Frischgewaagt and the adjoining properties with a second drill programme planned to commence in July.
Frischgewaagt is on a 6 km kimberlite dyke/pipe complex averaging 1.34 m in width. The project is also 2 km along strike from the nearby Marsfontein mine which was 0.4 ha in size producing at an average grade of 172 cpht at a bottom cut off of 1.2mm. Marsfontein achieved a payback of capital in under four days.
“This is an excellent result and shows the potential of Frischgewaagt,” says Botswana Diamonds chirman John Teeling.
“We need more drill samples to refine the grade estimate. This will be done in the coming months. Earlier work indicated diamond values of over US$200/ct. The geophysics work which is almost complete and the drilling to follow is targeted to produce an Inferred Resource by the end of the year.”