Ruins - Resort or Mining?

This is located in an isolated portion of southwestern South Mountain Park, approximately where 21st Avenue and Ray Road would meet if it wasn't in the middle of the desert.

I have heard two different explanations for what these ruins are the remains of, a mining camp and a resort.

I would love to know for sure, if anyone has any more information (hard evidence, an article or other paperwork) that would be great, but at this point I'd love to hear any word of mouth explanations.

Picnic in 1930's or 1940's