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OK I'm posting this one in hopes that someone can fill in the blanks. I've seen it mentioned in almost every list of Lost Treasure but have yet to get any details.

In 1541 Coronado made his infamous journey through what now is Kansas in search of the fabled golden cities of Quivira. The story is short and sweet that on crossing the Arkansas River, led by the Indian guide Turk, they buried from 3-5 million in gold.

Thats the short and sweet of what I've been able to find. Several problems here including the area Coronado was thought to have crossed.

The oldest crossing of the Arkansas was where 2nd street crosses the Arkansas. The earliest accounts of travelers of the Santa Fe Trail talk about crossing the Arkansas at the Lone Sentinel. The Indians said this crossing has been in use for as long as they have memories. Chances are the hill that Coronado held the first Christian mass on was our now infamous Boot Hill.