Answer:
The person who discovered the lost mine was Padre Phillipe La Rue and the mine was abandoned because Franciscans sent a search party to find Padre Phillipe La Rue because he wasn't reporting back to Franciscans. When Padre Phillipe La Rue saw the search party looking for him he abandoned the mine because he thought the search party was going to take over his mine and take the gold from it.
Step-by-step explanation: