does this minera run on top of a rasp os? slightly confused on that..
it depends. You can have a Raspian image running, then install Minera into it 'manually'
or DL the minera img, and poof, its like magic. running on its own.
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reread the question...
if your asking if that minera img is running on rasbian, that part i dont know. its likely.
How about... whats your need? ie: why do you want to know that part. maybe it'll show how to answer better..
or.. get past the first part , and the next answer will tell you more!

hope some of my random babble helps.
g
ive got my zeus's going on that cgminer scrypt on a laptop that my kids have thrashed.. so i got a raspberry pi coming and although it has cool things i dont mind if it is just a miner..
and if I was able to load an OS and then manually load it and also do some stuff while mining.. that would be cool too...