I don't know of any mines in the Sandias, but in about 1985 I heard a young woman in a restaurant tell a story about a cache located high in the Sandias on the west side above Albuquerque. It was in an empty 10 ft by 10 ft square hole, 10 ft deep, carved in solid rock. There were gold bars stacked on the floor.
The young woman said she was told this story by her grandfather when she was a little girl. Grandpa got the information from a man in a UFO that landed in a wooded area with big trees nearby who said the owners of the gold would return for it later and use it for the benefit of Native Americans.
Ordinarily I would pay little attention to a story like this. However, the young women showed me an old dog-eared Polaroid print she had in her purse. She said it was taken by Grandpa and given to her. Later I found out Grandpa was a well known UFO contactee named Paul Villa. I found a UFO photo online years later that was attributed to Paul Villa. It was the same UFO on the Polaroid the young woman showed me.
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