Ann: Resources and Reserves Increase, page-25

Results from process testwork in February 2018 have confirmed that the Duncan mineralisation can be processed in a very similar manner to the CLD mineralisation with comparable recoveries and performance.

THIS is the only relevant information that changes a lot, because since the scoping study it was written in stone, that ...

"Capital cost estimate for the proposed Duncan processing plant: approximately $600 million.
Cash cost of production: approximately $40 per kilogram of REO. (This cost is significantly higher
than the equivalent cost for the CLD because the proposed Duncan process involves direct
chemical beneficiation.)
Production: approximately 13,000 tonnes per annum of REO, excluding cerium.
Modelled throughput: approximately 500,000 tonnes per annum."

https://www.lynascorp.com/Shared Documents/Investors and media/Announcements and media/2012/Duncan_Update_Clean_FINAL_140612_1119182.pdf

As far as i followed the story, there has never been a tangible update or any progress been reported about Duncan since 2012 (otherwise please feel free to show the numbers and a reliable source). Anyway, there has to be made another expansion of the LAMP (why not, if Malaysian government can be "sustainably" convinced?) or a second separation plant ... because 60% more lifetime might be nice, but being the only non-Chinese supplier should motivate to get a bigger bucket, before it starts to rain lobsters for a short period and other ones also try to profit from this period.