Hi Akro, the Cacuilo River on our lease is slow moving and meandering. Therefore, it often does not have enough power to pick up the big and heavy "special" diamonds and carry them a great distance. So the "specials" tend to stay close to the source and keep their rough edges as you mentioned. Our lease sits on the Lucapa Graben craton boundary resulting in a high proportion of Type IIa diamonds.
The Warwick Grigor Site Visit field report covers these points well, link below.
http://www.goldinvest.de/wp-content/uploads/FarEastCapital_LucapaDiamond_SiteVisit_July2015.pdf
Ann: Lab Results Confirm Kimberlite Target Areas, page-179
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