Request #176

 I’m looking for a young adult fiction book that was owned by my father (born in the mid-1950s), and read by me decades later about a boy and girl visiting or exploring somewhere in the Southwest United States.
They find something secret out in the hills (a mine, a cave, or some other secret) and try to learn more about the man trying to keep it secret. He is the antagonist and an adult whose love of canned Del Monte peaches is mentioned on more than one occasion along with describing a heap of empty peach can in the corner of the cave.
Another odd recollection is that the antagonist (the man) had a big Winchester rifle in one of the old (now obsolete) Winchester buffalo hunting calibers like 45-90, 50-90 or 50-110.

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