Credit: NormanEinstein / Wikimedia Commons The most common mining method used was drift mining, meaning that access to the deposits was through tunnels dug from the surface above sea level, following ...

Underground, at a depth of 1,000 ft (305m), is Birkshead drift mine where a lengthy system of conveyor belts snakes its way from where the stone is mined to where it is treated. "You've got to ...

“The connection drift development and test mining efforts have been very successful to date, which is a testament to our mine crews’ ability to operate safely and efficiently.