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| Buildex, Inc. producer of haydite expanded shale lightweight aggregate, used in the production of lightweight concrete masonry, structural concrete and fill aggregate. http://www.buildex.com |
| Central Pre-Mix Development Corporation Holding company whose subsidiary operating companies supply concrete and asphalt to the Northwest. http://www.centralpremix.com |
| Derbyshire Aggregates Ltd. Supplies aggregates and industrial minerals for landscaping, decorative surface dressing, pebble dashing, and flooring. http://www.derbyshireaggregates.com/ |
| Granite Construction, Inc. Diversified heavy civil and highway contractor and construction materials producer. http://www.graniteconstruction.com/ |
| Hydraulic Press Brick Company Manufacturers of Haydite expanded shale, lightweight aggregates for structural concrete and masonry applications, horticultural and bonsai soil amendments, and landscaping ground covers. http://www.hpbhaydite.com |
| New Ulm Quartzite Quarries Producer of crushed aggregates for concrete, bituminous, road base, railroad ballast, and industrial grits. http://www.nuqq.com/ |
| Upper Canada Stone Supplier of specialty aggregates, sands, and mineral fillers to architectural and industrial customers. http://www.uppercanadastone.com/ |