Looking at the numbers5 Sep 2018 21:07
I have taken the following paragraph from a 2010 rns regarding Storuman
The 2010 Scoping Study delivered a base-case project NPV of US$33 million, and an Internal Rate of Return (IRR) of 24% at a US$303/tonne mine gate fluorspar selling price and a capital pay-back of less than 3 years. The Company notes that at the current fluorspar price of US$460/tonne CIF Rotterdam the Company's Scoping Study base-case financial model generates a NPV of US$123 million (at a comparable discount rate of 8%), an IRR of 50% and a 1.7 year payback. Although the grade-tonnage data on which this financial model is based is no longer current it serves to illustrate the positive effects of the rising fluorspar price.
So since that scoping study was done the price of fluorspar is now over $500 even at the time the study was done the price was around the $450 mark but the company insisted a conservative figure of $303 was used
JORC confirms 27.8m tonnes or ore with 10.2% ore so 2.8m tonnes of fluorspar concentrate opposed to the 2.2m used for the scoping study
Based on all the above the nvp for Storuman should be well in excess of $150m
So my $20m figure is looking very conservative