The parcels consisted of 101 stones for 18.571 carats and 130 stones for 17.791 carats - all recovered from the site as of May 4.
A coherent chain of custody was established from the BK16 kimberlite: To the dense media separation (DMS) treatment plant; to the company's diamond recovery facility; to Lucara's cleaning facility; and then to I Hennig's secured storage facility, where they will be kept after the cleaning has taken place.
Following the acid cleaning, a size frequency distribution (SFD) study as well as a diamond reconstruction and breakage study (DRB) will be undertaken.
This is to predict the diamond size frequency in a deposit and contributes significantly toward the estimation of expected revenue.
Diamond breakage could skew the SFD toward the finer sizes as larger diamonds are potentially broken into many smaller pieces.
This breakage study will also compare the parcel of historic diamonds that were recovered between 1999 and 2000 from previous operations.
The BK16 kimberlite pipe is around six hectares at surface and is known to contain rare and valuable Type IIa diamonds.
All 243 LDD (large diameter drilling) samples and all historical tailings have now been processed through the company's DMS (dense media separation) plant in Letlhakane, Botswana.
The DMS plant is currently processing tailings retreatment samples for audit purposes and this should be completed within the next two weeks.