OK, I thought my post was idiot proof, but I was proved wrong..
You and your prospecting partner are not in love and don't live in the same house, nor do either like those dips listed.
It's always been finders keepers with anyone I've ever been with. I can't imagine wanting half of a nugget that my detecting partner found, or vice-versa.. If he finds a good one just work hard to find the next one... now dredging or sluicing an arrangement would be smart, but for detecting I'd say the digger gets it.
Here's a promise..... Me Hangtown and Aufisher are on the claim........ we dig a pennyweight we will argue over who is taking it home...all trying not to be the guy with the poke at the end of the day... We dig an ounce plus slab.......the hacksaw may come out.