skip to main content | skip to footer
N.C. Department of Environment and Natural Resources

NC Department of Environment and Natural Resources
Energy Mineral and Land Resources - Primary Crushing

Energy Mineral and Land Resources

Web Content Display Web Content Display
 Crushed stone (aggregates) 
 Primary crushing 

Primary crusher -- rocks up to 5 feet by 4 feet by 4 feet are crushed to 8 inches in diameter or less. Water spray reduces dust. This crusher is located inside the pit to reduce noise. For scale, note man visible in control room window.
Trucks with a capacity of up to 50 tons haul rock from where it is blasted and loaded by hydraulic shovels to the primary crusher. For scale note man in the window of the control room (left). 

Rocks up to 5 feet by 4 feet by 4 feet in size enter the primary crusher which reduces the size to 12 inches or smaller. Water is sprayed to reduce dust. Water is conserved and recycled in the mining and washing operations.

The primary crusher in this quarry was initially located on the surface. As the quarry was deepened, the primary crusher was relocated to the bottom of the quarry to minimize noise. 

The yellow device (left and below) is used to reduce the size of oversize rock so that it will enter the primary crusher. The yellow devise is also used to open 'rock jams' in the bin above the narrow opening to the primary crusher. A detail view of rock entering the primary crusher is shown below.

The primary crusher crushes more than 1.5 million tons of  stone per year. This is enough crushed stone to make 60 miles of road or 5,000 homes.  The primary crusher and related equipment cost several million dollars.

Process water from washing the rock here and the sizing plant, and from rainfall is gathered at the lowest point (sump) in the mine. Clickhere to learn more about the sump.

This view into the feed opening of the 48 inch by 60 inch jaw crusher. Rock enters the crusher from the rock box and grizzly feeder on the left. Yellow hydraulic jam-breaker is visible over feed opening.

 
38334 FEEDBACK

Your input is valuable to us. Please send us your feedback.

What type of feedback would you like to send?*

Ask a Question Report a Problem Have a Concern Make a Comment

(If you would like us to respond please include your phone or e-mail.)

Your Question has been sent. Thank you!

An internal server error prevented Your Question from being sent.
Please try again later, or call Toll-Free (877) 623-6748 for immediate assistance.

Please complete all highlighted items

Your Problem has been sent. Thank you!

An internal server error prevented Your Question from being sent.
Please try again later, or call Toll-Free (877) 623-6748 for immediate assistance.

Please complete all highlighted items

Your Concern has been sent. Thank you!

An internal server error prevented Your Question from being sent.
Please try again later, or call Toll-Free (877) 623-6748 for immediate assistance.

Please complete all highlighted items

Your Comment has been sent. Thank you!

An internal server error prevented Your Question from being sent.
Please try again later, or call Toll-Free (877) 623-6748 for immediate assistance.

Please complete all highlighted items

*If you are a DENR employee with an I.T. issue, please submit a DOTS ticket.