Considering the following prices Sorby Hills (KBL 75%) has something to offer
Lead is approx 3,000 per Tonne AUD
Silver approx 24 per oz AUD
Quoted from the following article
"The modest capital expenditure venture was originally planned to produce up to 80,000 tonnes of lead and 2.8 million ounces of silver a year from the shallow ore body, with an estimated annual value of more than $200 million"