Browse TRAIL Inventories

Diamond drilling blast holes, Bell Mine, the Warner Co., Centre County, Pa.

Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.

Diamond-drilling blast holes, Eastern Magnetite Mine C

Blast-hole drilling with diamond drills at the Tennessee Copper Co. mines, Ducktown, Tenn.

Blast-hole diamond drilling in California mines


Published Year

Subject

Author