Eldorado was not where it was supposed to be, they were...

Eldorado was not where it was supposed to be, they were searching in the wrong area in northern brasil and trying to find a city of gold next to an inland lake with many eyewitness accounts.

Sir Walter Raleigh lost his head, his best friend and his son to the search but he established the Guyana colony and the Guyana shield gold line was discovered

https://en.wikipedia.org/wiki/El_Dorado#Walter_Raleigh

This may well be the real eldorado, called Tallman open pit,
Wherever Eldorado is, it would have to be a high grade open shallow deposit on the shield line, much like Tallman is.
With the highest grade of gold in the region, deep in the rainforest 10km north of TRYs Karouni mill now wholly owned by TRY

Its drill and dozer ready looks like.

https://*********.com.au/wp-content/uploads/2018/11/Troy-Resources-ASX-TRY-Ohio-Creek-gold-assays-640x400.jpg