A gold mine. Eagle's Nest was a discovery pit at the top and some adits lower down in a five level deposit of crystallized gold.
The De Maria Mine is also on this deposit. The Mystery Wind Mine does not exist (Dona Leich, pers. comm.) and is a made-up name from highgraders. Mystery Wind specimens should be labelled Eagle's Nest.
Ref.: (in part):
- Min.Rec.:20(5):387.
- Leicht, W. and Cook, R. (2004). "The Eagle's Nest mine, Placer Co., California." The Mineralogical Record, 35(1),pp:65-72.