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Genesis chapter 10:29-30 says Ophir was a son Joktan and settled between Mesha and Sephar to the east. This was considered to be in southern Arabia which is the world's largest peninsula made up mostly of Saudi Arabia and a few countries below it which is mostly desert. The mines would probably be in that general area. If I remember correctly, Edgar Rice Burroughs, who wrote the Tarzan novels, used the city named Ophir fictionally several times in those books placing it somewhere in Africa which is probably why the movies about Solomon's mines take place there.

King Solomon's Mines are the product of the imagination of Sir H. Rider Haggard. A number of sites have been identified as the location of the mines of Solomon, including the workings at the Timna valley near Eilat, and many "fictional" locations.

Good Question!

But what you should ask is: What is the proof that King Solomon ever existed?

i don't be attentive to approximately distant places videos yet Romancing the Stone and Jewel of the Nile have been very Indiana Jones-like with Michael Douglas and Kathleen Turner completed interior the early 80's.