Earlier quoted context omitted.
1) Mark the location by GPS coordinates, write it down in a few safe places, get back to civilization and make a plan 2) Hike out the hoard in several batches 3) If you are a particularly paranoid sort of person, unless the coins are worth significantly more by their rarity value, buy a $2000 furnace and crucible and melt them down into bars. Sell the bars at a slight loss below the value of 99.999% purity.
This is not how physical gold works. My understanding is that it's tightly regulated with unique identifiers for all ingots, bars, etc and the ownership of each being recorded so there is an audit trail if a diluted bar or ingot is found later. I assume freshly mined gold has to go through some type of formal lab validation / certification for purity that puts it into this identification scheme. I expect nobody will…
Edit: Google "gold scrap refining", it is not an uncommon thing.