In recent weeks an X-ray sorter machine has been commissioned, which has so far sorted 56 of the drilled out concentrate samples from the six hectare site, representing 925 kg of DMS (dense media separation) concentrate.
An experienced diamond classifier was deployed for five days to sort the first X-ray concentrate samples, Tsodilo said.
One hundred and one (101) diamonds (18.571 carats in total) were recovered from these samples, the largest of which was 1.375 carats, it added.
The pipe is known to contain rare and valuable Type IIa diamonds, and the stones recovered so far are very similar in appearance to those diamonds that have been recovered from previous operations, the group added.
Final diamond counts and initial weights will be compiled once all samples have been processed, sorted, and a thorough tailings re-treatment audit has been carried out.
In the bulk sampling work, all of the 243 drill samples from the project have been processed through the company's 10 tonnes per hour (tph) mobile Dense Medium Separation (DMS) plant located in Letlhakane, Botswana.
The total concentrate weight (wet) from the around 1,441 tonnes of kimberlite delivered to the plant was slightly over 5,300 kg.