Not too worried about met work at this stage (obviously a lot...

Not too worried about met work at this stage (obviously a lot more testing to be carried out) & ore sorting appears promising.

2015 Worley Parsons Met Optimisation

 Optimisation study from WorleyParsons has increased Severn tin recovery by
7.4% to 79.5%

"The current metallurgical testing program has focused on the Severn deposit which forms
approximately 60% of the overall tin resource for the Heemskirk Tin Project. As yet the same rigorous
approach to metallurgical testing and optimisation has not been applied to the Upper Queen Hill,
Lower Queen Hill and Montana deposits due to limited availability of suitable samples. However, it is
expected that many of the learnings and process improvements from the Severn program will be
translatable to these deposits, particularly improvements achieved with respect primary grinding,
sulfide flotation, gravity and dressing circuit configuration, and tin flotation".


Managing Director Peter Blight said: “This is a significant milestone for the Heemskirk
project for two reasons. Firstly, it has demonstrated a step up in recovery for Severn,
the major deposit, and promises improvements for the other deposits which to date
have not been tested to the same degree. Secondly, it has provided robust data for
optimising design criteria and processing conditions ahead of a definitive feasibility
study to commence in 2015. The Severn results have also been measured against the
neighbouring Renison Bell (Metals X) tin processing plant when it was in its prime and
stack-up extremely well, an outcome that reinforces management’s view that there
is much more upside to be harnessed at Heemskirk.”



Steinert & Tomra ore sorter tests carried out in 2017/2018 appear to be very promising & to be added to the process after more testing. Dizier taking out of equation in latest resource estimate due to low recovery rates (60%+ from a discussion with Fietz a year ago?). Could be a possibility into production if economic viability is evident (tin price/recovery).