Hi Алексей Игнатьев,
Ticket: https://support.ageoflords.com/support/tickets/40288
Thank you for reaching out!
To answer your question, once a Gold Mine has been emptied out, another one will immediately re-spawn in a random location on the map.
Besides the answer to your question, I will leave below more information about how Gold Mines work, just in case we can fill any more blanks regarding this feature:
Gold Mines will appear after a FvF Event in the winning Front/Kingdom. They appear for 24 hours after the event has finished. Gold is collected much slower than other resources. One Gold occupies 1000 unit load. Boosts and skills do not increase Gold gathering speed. Gold Mines store less resources than other Resource tiles. You can get attacked on both level 5 and 6 Gold Mines.
If there is anything else we can assist you with, please do not hesitate to contact us! As always, we are just a message away!
I wish you the best in your future endeavors and a great day ahead!
Kindest regards,
Alexandra S - the eRepublik Labs Support Team
Алексей Игнатьев