RE:Purcell on MPVDMountain Province news release 2 April 2014:
"Diamond revenue for the Feasibility Study is derived from the modeled diamond price estimate provided by WWW International Diamond Consultants (February 2014 price book) exclusive of any marketing fees post government valuation. Price forcasting is inclusive of a real 1.5% escalation over LOM. Average modeled diamond price in 2014$ is $118.38."
WWW rough price index February 2014 was 235 (with index for January 2004 at 100). WWW rough price index November 2019 was 174 - 26% drop over Feasibility price assumption of $118 - or $87 per carat. It was certainly not sensible to use a 1.5% price escalation over LOM.