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I would just like to point out that you don't actually need Cartography or Remove Trap. This is a technicality, but it is worth keeping in mind.(This is all as of the last TC release, I have not checked any of this on Live yet. If someone else wants to confirm/deny, please do so.)You can dig up all maps including Trove with 0 Cartography skill. Cartography affects the chances to get a Gold chest, but not your chances to successfully dig up the chest.
You can also remove the trap on all chests, including Trove, with 0 Remove Trap skill. Remove Trap skill allows you to remove the trap with fewer attempts (and fewer Ancient Guardians), but 0 RT skill does not prevent you from successfully (eventually) removing the trap.
I'm not saying you should run a t-hunter with 0 Cartog and 0 RT, I would not, but that low skill is technically an option.