I have never heard of Mansa Musa. Quick check shows he died 585 years before the end of the Ottoman empire and went to mecca, not anatolia.

Back to south America, we have already covered the fact that there was abundance of silver rather than a scarcity, which was the case everywhere else. Scarcity is one of the intrinsic features of precious metals, hence the term precious, hence their value.

To say silver has no intrinsic value would be saying nothing has intrinsic value. The main veins have been exploited, tons of earth have to be moved per ounce. Were there isolated times in history in isolated places where veins were bursting on surface? Yes, those are exceptions.

It has industrial uses as well. There is a reason the US constitution defines the dollar in terms of silver, that is because it has intrinsic value.