Arizona Onyx Company, a division of Stoneworld Company, is the worlds only supplier of Grand Canyon and Black Canyon Onyx. In 2003, Arizona Onyx Co. was formed after extensive testing suggested that the deposits were in excellent condition for quarrying. The quarries are located just off of highway 69 in Mayer, Arizona allowing for easy access for trucks. Testing has proven that the quarry contains more than 100,000 tons of onyx, but yields only 10,000 tons of premium blocks. Large premium blocks for slabs are available as well as mid-size and small block for tile.