“an image of gold.” The statue would not have had to have been pure gold to be considered “an image of gold.” It was almost certainly overlaid with gold.
“whose height was sixty cubits, and its breadth six cubits.” Given the standard 18 inch cubit, the statue was about 90 feet (27.5 meters) high and 9 feet (2.7 meters) wide. These are not normal human proportions, so it is likely that the statue measurement included some kind of base for the human-like statue.
“in the plain of Dura.” This location has never been specifically identified, and there were several different places that had that name. It makes sense, however, that this “plain of Dura” was located close to Babylon. Also, a statue of this size would be very possible. There were other tall statues in the ancient world. For example, one of the seven wonders of the ancient world was the Colossus of Rhodes, which was a huge statue of the god Helios that stood at the entrance to the harbor at Rhodes, and it was said to be seventy cubits tall (105 ft or 32 m), and so it would have been even taller than Nebuchadnezzar’s statue.