Early stage copper projects have grades one-third below operating mines
The next generation of copper mines will not only have less copper but sharply declining grades, according to a study by Mining Intelligence.
Operating mines currently have an average grade of 0.53% while copper projects under development have an average grade of 0.39%.
mining.com
...should help to provoke those "kicking tires" around Hay Mountain, with it's potential for Bisbee-like grades, IMO.
VP