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Welcome Concrete Dispatch: 302-656-9999 Aggregate Dispatch: 302-698-5510 With offices in Wilmington and Dover, Delaware, Pioneer Materials is the region’s leading construction materials supplier and has been serving the Delmarva Peninsula and surrounding area for over a half a century. Pioneer Materials has five ready mix concrete plants strategically located in Wilmington DE, Frankford DE, Cheswold, DE, Delmar, MD, as well as in Avondale, PA. The company also operates two sand and gravel plants in Dover and Little Creek, DE. Additionally, Pioneer Materials has stone yards in Dover, Felton, Dagsboro, DE, and Delmar, MD. 
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