Onyx Crushing AZ LLC is a husband-and-wife Arizona crushing company. Founded by Kevin G. Schoonover and Terry L. Clark in late 2023 — built on Kevin's forty-plus years of crushing experience across the western United States.
Started in 1976 in the family business. Onyx Crushing AZ LLC opened in late 2023.
Kevin Schoonover started crushing rock in his father's business in 1976. Forty years and several careers later — at Kiewit, Granite Construction, FNF, Asphalt Paving & Supply, Fisher Industries, and CEMEX — he and his wife Terry Clark launched Onyx Crushing AZ in late 2023 to do the work on their own terms.
Kevin's crushed material for the Folsom Dam in California. He's run roll, cone, and jaw plants — including jaw crushers that swallow 5'×8' boulders. He's produced the rock for copper and gold leach pads in the southwest. Crushing technology has changed; the fundamentals have not.
The Onyx model is simple. We don't run a yard. We don't keep stockpiles. We don't sell aggregate. We bring our mobile crushing plants to your site — your pit, your rubble pile, your overburden — and we process it to the spec your project calls for.
In two and a half years we've processed over 2.5 million tons of material across six Arizona counties for clients including Haydon, Okland, Asphalt Paving & Supply, Lincoln Constructors, Vulcan, Rock Pros, Arcosa, and others. Production runs 350 to 500 TPH. Daily capacity tops out at 5,000 tons.
We're husband-and-wife operated. Kevin handles bids, scheduling, and field execution. Terry handles the books and cost management. Between us, we answer the phone every time it rings.
Kevin Schoonover starts in his father's crushing business. Over the next four decades he runs plants for Kiewit, Granite, FNF, AP&S, Fisher Industries, and CEMEX — including jaw plants that swallow 5'×8' boulders.
Kevin and Terry launch Onyx Crushing AZ LLC in Scottsdale. Mobile-only model from day one. Kevin takes the first dispatch call.
Started the MagABC road-base job in Yavapai County — 400,000 tons of material to be crushed over the contract life.
Prequalified to subcontract on ADOT projects. Four MSHA Mine IDs registered for the mobile crushing plants.
200K tons of AB and riprap for a La Paz County solar farm. 100K tons of riprap in Yuma County. 100K tons of decorative rock in Mohave County.
Building backfill and site utility backfill for Amkor Advanced Manufacturing in Maricopa County. MagABC still running into a second contract year.
23 projects, 6 counties, statewide service. Same phone number. Booking new work now.
When you call, you'll talk to one of these people — or someone who can hand the call to one of them. That's not a marketing line, that's how the company is run.
Started crushing in 1976. Over 40 years in the industry, including roles with Kiewit, Granite, FNF, Asphalt Paving & Supply, Fisher Industries, and CEMEX. Crushed for the Folsom Dam and produced material for copper and gold leach pads.
Manages bidding, negotiations, planning, execution. Handles logistics for scheduling, equipment delivery, and on-site set-up. Picks up the dispatch line himself — (480) 205-3126.
Bachelor of Science in Business Management. Manages company finances and plays an integral part in cost management — every job runs against a model that covers down time, maintenance, and overhead before it gets a number on it.
Husband-and-wife company. Two owners, two phones, one accountability chain.
We don't subcontract our operators. The people on the plant are Onyx crew, MSHA-certified, and trained on the equipment we send to your site. 4 MSHA Mine IDs registered for our mobile crushing plants.
I began my career in the crushing and aggregate industry alongside my father in 1976, gaining hands-on experience in an operation where quality, production, and reliability were essential from the start.
Over the decades, I have worked on crushing operations throughout California, North Dakota, South Dakota, Wyoming, New Mexico, Texas, and Nebraska, supporting a wide range of transportation, commercial, mining, military, and infrastructure projects.
One of the highlights of my career was helping produce the first Superpave aggregate material for the North Dakota Department of Transportation — an experience that reinforced the importance of meeting demanding material specifications and maintaining consistent production standards.
My equipment experience includes roll plants, jaw crushers, gyratory crushers, cone crushers, impact crushers, and vertical shaft impact crushers, along with extensive experience operating and managing wash plants and aggregate processing systems.
Throughout my career, I have produced materials for hot-mix asphalt, aggregate base, concrete aggregates, and mining leach pads, adapting plant configurations and production methods to meet project-specific requirements and specifications. My experience has also included unique and demanding project environments, including crushing operations conducted directly at Camp Pendleton in California.
After nearly five decades in the industry, my approach remains centered on the fundamentals that have always mattered in aggregate production: safety, quality, efficiency, equipment knowledge, and delivering material that meets the project requirements.
Owner-operated since day one. When you call, you get a decision-maker — not a call center.
We quote schedules and we hit them. Plants set up in 24 hours, daily production reports.
MSHA Part 46 trained crews. 4 registered Mine IDs. Site-specific safety procedures every job.
In-house gradation testing, dust-control compliance, scale-certified tickets — proof, not promises.
Every Onyx Crushing operator is MSHA Part 46 trained and verified. Every plant runs a daily walk-around inspection. Every site gets a written Job Hazard Analysis specific to that location before we start producing.
Dust suppression water trucks travel with every portable setup. Where we work inside Maricopa County non-attainment areas, our crews carry the dust-control permits and stay on top of compliance reporting — which keeps our partners out of trouble too.