For Stone in Maryland, Delaware, PA See Maryland Materials
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Granite (gneiss) is the principal mineral mined from our operation. The stone mined from our facility comes from one of the hardest deposits of granite on the East Coast. Our ballast, asphalt and concrete stone are all washed to assure quality. Here are some of the more popular sizes with descriptions and uses. 10
Sharp

AASHTO #10 Screenings:For Stone in Maryland, Delaware, PA See Maryland Materials
   
For Stone in Maryland, Delaware, PA See Maryland Materials Crushed stone dust
For Stone in Maryland, Delaware, PA See Maryland Materials Ranges in size from a fine powder to approximately 3/8"
For Stone in Maryland, Delaware, PA See Maryland Materials Slow-draining
For Stone in Maryland, Delaware, PA See Maryland Materials Used mostly for walkways & pipe bedding. It can also be used as a "select" fill material & is one of the raw materials in Hot Mix Asphalt.
For Stone in Maryland, Delaware, PA See Maryland Materials Our #10 Screenings will meet the specifications for the following types of Borrow: State of Delaware - Types A, C, D, F & G; State of Maryland - Select Borrow, Common Borrow
   
 
Crusher Run, CR-6For Stone in Maryland, Delaware, PA See Maryland Materials    
For Stone in Maryland, Delaware, PA See Maryland Materials Measures up to an 1½"
For Stone in Maryland, Delaware, PA See Maryland Materials Mixture of coarse and fine stone is often used for roadways & for filler.
For Stone in Maryland, Delaware, PA See Maryland Materials It does not drain well but is extremely stable.
   
 
CR-1:For Stone in Maryland, Delaware, PA See Maryland Materials    
For Stone in Maryland, Delaware, PA See Maryland Materials Mostly clean material of coarse stone & crushed stone dust.
For Stone in Maryland, Delaware, PA See Maryland Materials Measures up to 2 ½"
For Stone in Maryland, Delaware, PA See Maryland Materials Generally used as a base for road construction where stability is an issue.
   
 
CR-8:
For Stone in Maryland, Delaware, PA See Maryland Materials		    
For Stone in Maryland, Delaware, PA See Maryland Materials Mixture of clean #8 stone & #10 screenings.
For Stone in Maryland, Delaware, PA See Maryland Materials Measures up to ½" top size.
For Stone in Maryland, Delaware, PA See Maryland Materials Primarily used as driveway material in rural areas.
   
 
MD/DE #7:
For Stone in Maryland, Delaware, PA See Maryland Materials		    
For Stone in Maryland, Delaware, PA See Maryland Materials Ranges in size from ¼" to ¾"
For Stone in Maryland, Delaware, PA See Maryland Materials Used in production of ready-mix concrete and asphalt.
For Stone in Maryland, Delaware, PA See Maryland Materials Dust coating on stone is rinsed off.
For Stone in Maryland, Delaware, PA See Maryland Materials Can be used to top-off driveways.
   
 
 
MD/DE #8:
For Stone in Maryland, Delaware, PA See Maryland Materials		    
For Stone in Maryland, Delaware, PA See Maryland Materials Clean material is approximately ½ inch (topsize)
For Stone in Maryland, Delaware, PA See Maryland Materials Generally used for decorative purposes (walkways), for pipe bedding or as one of the raw materials in Hot Mix Asphalt.
   
 
MD/DE #57:For Stone in Maryland, Delaware, PA See Maryland Materials    
For Stone in Maryland, Delaware, PA See Maryland Materials Clean material
For Stone in Maryland, Delaware, PA See Maryland Materials Measures approx 1"-1½"
For Stone in Maryland, Delaware, PA See Maryland Materials Generally used in Hot Mix Asphalt & Concrete or for walkways and driveways.
For Stone in Maryland, Delaware, PA See Maryland Materials It does not compact.
   
4
MD #2 / DE #3:For Stone in Maryland, Delaware, PA See Maryland Materials    
For Stone in Maryland, Delaware, PA See Maryland Materials Clean material measures up to
3" (topsize).
For Stone in Maryland, Delaware, PA See Maryland Materials Normally used in areas that require lining such as ditches or in construction.
For Stone in Maryland, Delaware, PA See Maryland Materials It will not compact.
   
 
 
R3, Large Ballast:For Stone in Maryland, Delaware, PA See Maryland Materials    
For Stone in Maryland, Delaware, PA See Maryland Materials Ranges from 2-6".
For Stone in Maryland, Delaware, PA See Maryland Materials Can be used to prevent soil erosion in light flow areas.
For Stone in Maryland, Delaware, PA See Maryland Materials Clean material.
   
   
RR
R4, Minus-12:
For Stone in Maryland, Delaware, PA See Maryland Materials		    
For Stone in Maryland, Delaware, PA See Maryland Materials Ranges from 6"-12"
For Stone in Maryland, Delaware, PA See Maryland Materials Can be used to prevent soil erosion in moderate flow areas.
For Stone in Maryland, Delaware, PA See Maryland Materials Works well for ditch lining.
   
   
 
Rip Rap:For Stone in Maryland, Delaware, PA See Maryland Materials    
For Stone in Maryland, Delaware, PA See Maryland Materials Large rock, generally used for lining larger ditches, easements or along rivers with a stronger flow of water. Sizes vary to accommodate differences in wave action.
For Stone in Maryland, Delaware, PA See Maryland Materials Classified in five sizes:
For Stone in Maryland, Delaware, PA See Maryland Materials 50-150, 200-400, 400-800,
800-1200, 1200-2500 lbs.
   
 
Miscellaneous:
For Stone in Maryland, Delaware, PA See Maryland Materials		    
For Stone in Maryland, Delaware, PA See Maryland Materials Yard cleanup material.
For Stone in Maryland, Delaware, PA See Maryland Materials Primarily used as a fill material.
For Stone in Maryland, Delaware, PA See Maryland Materials No standard gradation or specification.
For Stone in Maryland, Delaware, PA See Maryland Materials Subject to availability.
   
   
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
 
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
 
For Stone in Maryland, Delaware, PA See Maryland Materials
 
ABOUT OUR PRODUCTS
 
Maryland Materials' products are approved for use in Maryland, Delaware, Pennsylvania and New Jersey. The Company uses a state-of-the-art testing system to ensure our products are of the highest quality.

All of our aggregates meet AASHTO specifications and our subbase and rip rap products conform to state agency Subbase specifications and Rip Rap specifications.

Our deposit is a very hard, blue-gray granite and has advantageous chemical properties. The subbase products have excellent compaction properties. The coarse aggregates have specific properties advantageous to high strength concrete and Superpave chemical properties and Hot Mix Asphalt. Our railroad ballast properties make our ballast the choice of many local railroad companies.
 
GLOSSARY
 

Aggregate: The collective term for the mineral materials such as sand, gravel and crushed stone that are used with a binder to form compound materials. By volume, aggregate generally accounts for 92 to 96 percent of HMA and about 70 to 80 percent of cement concrete. Aggregate is also used for base and subbase courses for both flexible and rigid pavements. Aggregates can either be natural or manufactured. Natural aggregates are generally extracted from larger rock formations through an open excavation (quarry). Extracted rock is typically reduced to usable sizes by mechanical crushing.

AASHTO: American Assn of State Highways & Transportation Officials.

Gneiss: A coarse-grained metamorphic rock consisting of light-colored layers alternating with dark-colored layers of other minerals. Individual grains are often visible between layers.

Hot Mix Asphalt: This is the final product produced at an HMA facility which is a mixture of asphalt cement and aggregates.

Rip-Rap: A loose assemblage of large stones erected in water or on soft ground as a foundation.

Subbase: Often the main load-bearing layer of the pavement. Its role is to spread the load evenly over the subgrade. The quality of subbase is very important for the useful life of a road.
 
 

It is estimated that over 31,500,000 metric tons of crushed stone was sold in the state of Maryland in 2007. Those numbers are down in 2008, but will increase significantly as the economy begins to improve.

Source: Minerals.USGS.gov

Hints:
To convert cubic yards to tons, simply multiply the cubic yards by 1.5.

To convert metric tons to tons, multiply the metric tons by 1.1023.
 
 
 
 
 
           
   
     
     
     
  For Stone in Maryland, Delaware, PA See Maryland Materials

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For Stone in Maryland, Delaware, PA See Maryland Materials

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For Stone in Maryland, Delaware, PA See Maryland Materials