This specific 3D model, "Chinese gold ingot 3D model 20", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
The license for this digital asset is "Unknown license".
STL (Stereolithography, filesize: 8.66 MB), OBJ (OBJ, filesize: 2.66 MB), MAX (Autodesk 3ds Max, filesize: 11.8 MB), FBX (Autodesk FBX, filesize: 6.88 MB)