Just saw an excerpt from the new Daniel Day Lewis movie causing all the awards buzz, There Will Be Blood. He’s a prospector (oil, I believe) and one sees him taking a rock sample to the assay office. Here we get a close-up of a Scorification Certificate. Dismissing the wayward thought that this was Pentagonese out of place and time and signified score or scoring, I turned to OED.
The process of reducing to scoria; formation of scoria or slag; spec. as a method of refining or assay.
Moving on to scoria I find:
Scoria (prefaced with the symbol for ‘not naturalized, alien (not used in New Edition entries)’)
1. The slag or dross remaining after the smelting out of a metal from its ore. Also transf.
Interestingly it comes from the Greek word for dung, skor. It’s very true (adopting unconvincing Yorkshire accent). ‘Where there’s muck there’s brass!’