There are 2 problems as i see it for a mining event:
1. Amps and skills. You should make an event independent of size of claims and skills. Amps is of course normal because i can't compete for ex in a sistem like most loot or bigger claims with one that put on some 107 and up because my wallet ofc; then u can make an event like hit something unusual (rare ) and then will be complains about the skills like i can use an z20 and strakkan an vrx3000, so who is more likely gonna find that II claim of ruga

. And even if u specify that everyone should use the same finder is gonna be cheating involved as i can always use one deep finder, hit the claim and then exchange finders and take picture. So the only way i can think of a feasible event is that should be on different categories in skills like Mayheim and for each one the winner should be made by number of hits of something unusual or such and each miner should post at he beginning of the contest a picture with standing profession.
2. Location: it isn't really feasible to make the event on a single LA because there are many miners who won't participate knowing that the same piece of land is hit over and over so it has to be all over the map or such
I only said those things just to point the fact that in mining, oppose to hunting is way more difficult to put up with a decent events, because of the one mentioned above
However it wouldnt hurt to have more interesting claims from the ground

Just my 2 pecs