Hydraulic Mining Shovel (Polygon mesh 3D model) is available on CGTrader for $169. Original author: 3D-Horse. Specs: 2100697 polys, 2136870 verts.
OBJ (OBJ, filesize: 69.6 MB), 3DS (3D Studio, filesize: 34.4 MB), C4D (Cinema 4D, filesize: 41.3 MB), LWO (Lightwave, filesize: 40.9 MB), MAX (Autodesk 3ds Max, filesize: 146 MB), HRC (Autodesk Softimage, filesize: 88.7 MB), MA (Autodesk Maya, filesize: 133 MB)