News: SFR Sandfire Resources NL Posts QTRLY Gold Production 11,141 Oz, page-21

Wasnt being optimistic on that one... In fact I believe it is less than 3.45 years (if no more ore is found)...

What the market is worried about more than mine life above is:
1. That our earnings estimate is materially flat in 2019 due to Capex spend in exploration etc (see the terrible earnings chart below) but rest assured DeGrussa/Doolgunna is a 400 square kilometre tenement in the Bryah Basin mineral province of all places so we should be able to find some more... hopefully. When it comes to mining the old adage goes... "Where do you find a new mine? - right next to the old one..."

2. World growth prospect due to Trump's trade war. Dr Copper after all looks to be right most of the time. So far the doc says it's a slowdown in the medium term. The broader macro trend tells us there is a supply side issue with copper. Less than 30 days reserve last time I checked so when demand finally comes in, we are looking at a shot up in Copper price and that is good for SFR earnings (if analysis is right).