Given 70% of Sorby's value comes from Lead (Silver (20%), Zinc...

Given 70% of Sorby's value comes from Lead (Silver (20%), Zinc (10%)) you can't call it a silver project nor should it be closely correlated to precious metal.

As it is about 7.5%Pb eq it is hardly high grade; however at 16M tonnes it is long life and as it is shallow it will be cheap to mine.

Whilst I can appreciate why people are on the silver bandwagon lately, base metals, especially Zinc and to a lesser extent Lead, should perform much stronger anyway. 30-50% gains over the next few years, on top of their recent strong performance is very realistic.