I grew up in Bisbee in the 1960's. I remember when a 5 gallon bucket of "Blue Rocks was worth 5 bucks.

[Bisbeeguy]

What’s old Bisbee like now? I miss it sometimes. The waste dumps.. The water at the bottom of mining holes that turned your pocket knife copper plated.

[Steve]

at todays prices if you have any of those blue rocks left in your basement or garage it could be your hidden 401K asset portfolio

source: https://traderoots.com/Turquoise/Turquoise_Mines/