Someone put up a couple of pages out of the DRC mining code a few days ago, I can't remember who, but waivering was basically stripping of all rights, Partial waiver was pulling back of in our case the decree / Mining license but retention of exploration rights.
maybe this was the angle DG Cami took, I.e. ye big fella , partial waiver means a part of the tenement gets renounced ; where as Nigel and co may have being thinking ( you'd of hoped they'd checked ) partial just means as per the code that the ML rights come off , but Exploration rights are retained i.e as explained within the announcement when the decree popped out.
You would think that there would be another term sheet for actually fully renouncing as section of a tenement, as opposed to just calling it partial renounce and avoiding such confusion.