The 1st one I found on a new seed had 16 cores and just over 400 gold in coins and valuables. It was crazy though because I only had on leather armor and skeletons were pouring in from all 3 initials entryways, which had no doors. The whole room was full within a minutes of skeletons and there was at least a dozen of them and one ghost. I had to cheese them out standing where the melee skeletons couldn't get to and dip outside when the archer skeletons were wearing down my health. There was also 5 evil bone piles to deal with.

The 1st seed I went to only had 2 tombs with 2 cores each on the starting island, so I couldn't even make a smelter. The current seed I'm on has over 40 tombs and a trader. What do you even use coins for once you buy everything from the trader?