Tags: silica-rich rocks
J is for Jack The early days of drilling created a test of strength and endurance for miners. By Bill Langer Jack (n.) — used as a form of address for an unknown person — ‘It is common among schoolboys … to address ...
SUBSCRIBE & FOLLOW
- MSHA rolls out new Part 50 training program605 Views
- Mummified human remains found at the site of a planned quarry in Indiana421 Views
- Caterpillar splits with Navistar, will design and build its own vocational trucks in Texas397 Views
- MSHA highlights second quarter metal/non-metal accidents293 Views
- Lafarge NA sells $450 million in assets to Summit Materials232 Views