Ann: Scheme Book and Independent Experts Report, page-22

One way of looking at the surge in price is...

BDR suiter GPL shares went up another 6% to 71 US cents on the 31st Dec.   

Thisvalues BDR shares per the scheme at 6.3 cents. 

A technicaltrend up is in place for silver.   Likely to test $16 in near term, which is goodnews for GPL and therefore BDR shareholders. 

GPL has 3 brokers in America with strong buy recommendations.   Not surprising as they get BDR for bugger all.  

This article explains the silver movement very nicely and prospects for 2019.

https://www.*****.com/commentaries/2018-12-31/Silver-Starts-A-Breakout-Move-Higher.html