producer of haydite expanded shale lightweight aggregate, used in the production of lightweight concrete masonry, structural concrete and fill aggregate.

Holding company whose subsidiary operating companies supply concrete and asphalt to the Northwest.

Supplies aggregates and industrial minerals for landscaping, decorative surface dressing, pebble dashing, and flooring.

Diversified heavy civil and highway contractor and construction materials producer.

Manufacturers of Haydite expanded shale, lightweight aggregates for structural concrete and masonry applications, horticultural and bonsai soil amendments, and landscaping ground covers.

Producer of crushed aggregates for concrete, bituminous, road base, railroad ballast, and industrial grits.

Supplier of specialty aggregates, sands, and mineral fillers to architectural and industrial customers.