The Vermont Danby quarry is the largest underground marble quarry in the world. The quarry is entered through the same opening that has been in use for over 100 years. From the outside of Dorset Mountain the quarry looks the same as it did a century ago. From there the quarry twists and turns 1 miles deep where Danby Marble is quarried. Largest Rock Quarry In The World - dewiltenburght.nl. Largest Rock Quarry Producer In The World. Henry Warner first opened the Brownhelm quarry, later owned by the Worthingtons, points, until they became the largest producers of sandstone in the world The Buckeye Quarry is said to be one of the largest in the world, stone has been.