Black Hawk Rock and Boulders Central California quarry produces a wide range of shale rock materials from D. G. fines to large boulders. Materials are shipped bulked throughout Central and Northern California and on pallets anywhere requested. Black Hawk Rock and Boulders are shale material that is a black to black grey colored rock covered in full or in patches with a richly colored mineral patina that varies from reddish tone to burnt orange and rust color tones.
