Sandfire Limited (ASX:SFR) – a popular pick among some investment bank analysts for the long-term copper thematic – has posted evidence of extended mineralisation at its Portugese Sesmarias Prospect. Forming part of the Alvalade JV along TSX-listed Avrupa Minerals, the latest drill headline drill hit comes in at 41.2m intersection at 1.6% copper, 3.4% zinc and trace amounts of silver from 377m depth. Drill hits of that depth would be enough to tank a junior – but Sandfire, to remind or introduce the uninitiated, is a $4.1B market cap company. Geotechs interpret the target area of interest to b…