Many Christians refuse to even consider the Book of Mormon because of what they consider, a lack of archeological evidence to support it's setting and events. This is also what is know as a presumed problem of "historicity." The Book of Mormon's mention of steel, for instance, is considered an example of one of its major flaws. However, I think this minor bit of trivia will prove to be one of the Book of Mormons more fascinating evidences.
Finally, when he was commanded to build the ship to cross the ocean he immediately asks "where do I find the ore." It seems Nephi was well aware of what to do with the ore and how to make metal tools. I would also point out that Nephi says he obtained metal ore "out of a rock". This is again, perfect science. Iron in particular was obtained by heating/smelting ore (hematite or magnetite) containing rocks. Only very rarely was iron obtained from nickle-iron metorites:
1 Ne. 17: 9-10, 16 9 And I said: Lord, whither shall I go that I may find ore to molten, that I may make tools to construct the ship after the manner which thou hast shown unto me? 10 And it came to pass that the Lord told me whither I should go to find ore, that I might make tools. . . .16 And it came to pass that I did make tools of the ore which I did molten out of the rock.