Parts from VULCAN mining software

[vulcan2]

I am working with Vulcan (high end mining software) and want to export the orebodies and geometries that I have as solids into Abaqus.
I can export the solids as DXF files and open them in Autocad, but from there I can not export the file to a SAT format...???
Same thing for a topography surface that I exported from Vulcan to Autocad (dxf),

When I try to export in Autocad and select the surface with triangles it says.. no solids, Regions or ACIS bodies selected...
so it does not export anything...

Thanks..any help will be great...