My question, is there no regulation on quarries?
Pyrite testing should be done at the source, quarries.
Surly test intermittently would be better than NO testing at all.
How can builders test on site, before they use filling blockwork?
I have put together a few usefullinks on Pyrite:
NSAI publish two new Standards on Pyrite I.S. 398-1:2013 Reactive pyrite in sub-floor hardcore material