$49 Gold Ore Gravity Concentrator Industrial Mining Machine Low-poly 3D model by AurumModeling. Available on CGTrader with 24500 polys and 17800 vertices. Check it out on CGHub.
STL (Stereolithography, filesize: 76 MB), OBJ (OBJ, filesize: 207 MB), FBX (Autodesk FBX, filesize: 352 MB)