RE: RE: Webmoor21 Oct 2016 14:25
Webmoor, Diason answered most of the questions so I'll expand on your 1st question;
1; Why not sell diamonds? - During transition to producer it is important to prove/verify the deduced economics of the project. The base case flat real estimate of $164/ct vs estimated production cost intimates a 50% margin but must be weighed against actual cost and actual sales revenue to determine the actual margin. It is considered that small diamond tranches (less than 7K carats) don't attract sufficient buyers to get competitive bidding tension at tenders. Thus best market price need to be achieved to effectively assess projected estimates in order to define if things are healthy or if problems exist.
Each defined block is 20mx20mx20m and diamonds are not distrusted homogenously within blocks & varying facies (K2, K4, K6 & K8). Targeted high grade K4 requires on-going assessment for each block being mined. - i.e. Was the block grade lower?/what % waste ore dilution existed in mined block?/is there a processing plant problem? etc. etc. Accordingly, appropriate action can be taken to rectify where applicable. It's part of an on-going intricate assessment & controllability function!
Every run of mine that is processed requires ore from varying facies to be sequestered/isolated so that each can be verified separately for dilution/grade/quality/Size Frequency Distribution (SFD) and even peculiarities such as dominant colour of stones in a particular block and facie. This can only be done after stones have been cleaned, sorted, graded, weighed, assessed & valued. Similarly, final tailings piles (fines) from each run of mine is tagged separately & checked by the Geo to ensure the process is efficient.
The plant is purged/cleaned before running ore from different facies or even running "old" tailings and nothing is ever mixed to avoid false analytical data. Similarly, final tailings piles (fines) from each run of mine is tagged separately & checked by the Geo to ensure the process is efficient.
Overall, it forms a very comprehensive & methodical process which after completion requires the state diamond 'valuer' to do his evaluation on a batch which should be reasonably close to company valuation. Thereafter the batch must 1st be made available to local buyers for a 4 day period (local beneficiation laws), prior to export to Antwerp. If local buyers prices exceed the company reserve valuation, then that particular batch is sold locally. The entire process can take between 40-50 days from run of mine to cash in hand at tender in Antwerp if exported due to S.A. export & Antwerp import regulations.
Hope it helps answer your question!