90% recovery will be an awesome achievement !
Well worth the delays attributed to refinement of process control parameters.
Previous tests at CSIRO indicated over 70% tin recovery was achievable and the DFS was initially targeting an 80% tin recovery. Recent results at the Mt Garnet lab are consistently exceeding 80% tin recovery with suggestions that 90% can be achieved. This requires fine tuning of the tin fuming environment within the kiln to match the ore feed which must be trialled one batch at a time.