hard-rock mine

hard-rock mine

[′härd ¦räk ′mīn]
(mining engineering)
A mine located in hard rock, especially a mine difficult to drill, blast, and square up.
References in periodicals archive ?
Government Accountability Office said 161,000 abandoned hard-rock mine sites dot 12 Western states and Alaska.
That permitting effort at Red Dog has continued in earnest this year, even through market prices for the base metals produced at the remote hard-rock mine have remained lower than past years.
Farther north, at the Empire Mine state park in Grass Valley, visitors can descend a few steps into the mouth of a hard-rock mine - and gaze into a hole that ultimately extends more than two miles down and is interlaced with 367 miles of tunnels.
In a reconstruction of a hard-rock mine, they fire up noisy hammer drills to punch holes in granite boulders (the noise is deafening).
After 15 years of exploration at the remote Donlin Creek gold project in southwest Alaska, property owners have put together an open-pit, hard-rock mine proposal backed by a feasibility study indicating low cash costs to produce more than a million ounces of gold annually, while providing up to 800 year-round jobs.
which had acquired Nixon Fork the previous year from Nevada Consolidated, a company that first opened the hard-rock mine in 1995.
Rocklogic claims to be the only automated system applied to hydraulic boom and hammer assemblies used to reduce the size of material in crushing operations at hard-rock mine sites.
And now, after spending about $50 million in the last three years on the exploration property, Pogo's operators have taken the leap-submitting to state and federal agencies a plan to build and operate a hard-rock mine at the deposit, located 38 miles northeast of Delta Junction.
Hard-rock mine employment also increased during the year due to increased production at Red Dog and Greens Greek mines and the commissioning of the Fort Knox and Illinois Creek mines.
which owns the huge Fort Knox hard-rock mine near Fairbanks, have deeper pockets and more flexibility to deal with reduced prices.
Results have included Congressional action, but not success, on mining law revision and the need for a hard-rock mine royalty to provide funds for the cleanup of abandoned mines.
Hard-rock mine employment also increased during the year due to increased production at Red Dog and Greens Creek mines, and the commissioning of the Fort Knox and Illinois Creek mines.