I guess I wasn't clear, but by bonus site I meant "ritual/forge discount" site. Obviously just considering opportunity costs it most likely wouldn't be any other kind of site.
Most earth sites look like a different icon... slightly brighter and mistakable to look like a brown harp (for me, I blame my poor vision :P), whileas this one looks like... uhm, something else, so I assumed it was a more unique site. I'm not writing off the Death site either, but if it is a death bonus site I sure as hell won't be able to tell since that icon looks like the generic death magic site.
I'm assuming the sites are somewhat special since I know several nations in the game have pelted the province with a variety of things and the pretender who can stealth is instead sitting there not moving. We're on turn 57 (or 58?) on an easy-research game with most artifacts forged so I'm putting more money that it's a ritual discount site than anything else. Yarg I'm confusssssseeed.
PANGAEA STOP READING MY NOOB QUESTIONS ABOUT WHAT YOU'RE DOING!!!! (Ahem, j/k

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PS - Oh, I vaguely remember a bug in earlier versions of Dom3 where if you overcast your discounted global, the bonus gems didn't apply until you exceeded the original cast cost. (Example - I cast GoH at a 20% discount site for 40N instead of 50N, but if I put 50N gems in it total I do not get the +10DRN bonus.) Is that still true or did they fix it?