Mount Multi-partition Disk Images

If you have a disk image file that includes multiple partitions use the kpartx command to be able to mount each partition:
kpartx -v -a diskimage.img
This adds loop devices which you can then access from within directory /dev/mapper. Use the mount command to gain access to each partition:
mount -o loop /dev/mapper/loop_device /path/to/mountpoint
Once finished, unmount each partition mounted and then close/detach the diskimage with the command:
kpartx -v -d diskimage.img