Harleysville Materials

Quarry and Asphalt Plant

In the heart of Montgomery County is one of the oldest Argillite Quarries in the area. This ancient quarry was formerly known as the S Stone Quarry in Lower Salford Twp., and was taken over by Elwood A. Groff (circa 1924). It is known as the oldest quarry in the region by tools that were unearthed and dated back at least 150 years in the early 1920’s.

Today we continued the rich tradition of mining here in Montgomery County and expanded our operations to include a Hot-Mix Asphalt Plant. We are easy to get to and able to service the Delaware Valley and all points in New Jersey.

Operating Hours

  • 5:30am - 4:00pm Monday through Friday
  • 7:00am - 12:00pm Saturday (In Peak Season)
  • Other hours available upon request (CALL)
  • Scale House: 215-256-8813 Fax: 267-933-6700

High Quality Argillite stone – PA and NJ Approved

  • Construction Aggregates of all sizes, custom blends on request
  • AASHTO #10 Screenings
  • DEP Sand Mound Sand
  • AASHTO #8 Stone
  • AASHTO #57 Stone
  • AASHTO #3 Stone
  • AASHTO #1 Ballast
  • AASHTO 2A Mod.
  • Rock Lining stone R-4 to R-8 in Size
  • Decorative Red Stone - All Sizes
  • 1B Red (Nominal size ½ inch)
  • 2B Red (Nominal size ¾” inch)
  • #10 Red Screenings
  • #3 Red Stone
  • 2A Mod Red
  • Shot Rock Red

The quarry’s red stone and aggregates are the highest-quality available and ready for immediate production and pick up or delivery.

The Mount Group is extremely excited about the addition of Harleysville Materials to our group of companies as it integrates perfectly with our existing capabilities and allows us to leverage our current trucking and distribution infrastructure to provide another high-quality service to the Tri-State area”, said Dave Smith, Founder and CEO of the Mount Group.



Asphalt Plant at Harleysville


Quarry (1) Harleysville


Quarry (2) Harleysville

Hot-mix Asphalt Plant

The asphalt plant located onsite is open and operated by ICM. Please contact Mike Sau at 610-960-3152 or email at michael.sau@icmatls.com for more information.

A digital electronic scale house is on site with a second scale already in the pipeline to propagate quick efficient service for our customers. Harleysville Materials has an on-site testing facility to ensure consistency and quality control of all our products.

We look forward to hearing from you in the near future and giving you a tour of the facility. For more information call the Scale House direct at (215) 256-8813 or via email contact Craig Cinalli ccinalli@harleysvillematerials.com or Darrren Hummel dhummel@harleysvillematerials.com

Map of our Location


The Mount Group also owns and operates an Alternative Materials and Recycling facility in Fairless Hills, PA at the Keystone Industrial Port Complex. Please visit our Mount Materials page for more information about our services.

Physical Location

  • Harleysville Materials, LLC
    460 Indian Creek Rd

    Harleysville, PA 19438
  • Scale House 215-256-8813
  • Fax: 267-933-6700
  • Coporate Office 856-768-8493
  • Fax: 856-753-1453

Mailing Address:

  • Harleysville Materials
    PO Box 587

    Berlin, NJ 08009