Elmina Castle is fortified trading post built by the Portugese in the late 15th century along the Gold Coast of Africa. What was exported from its docks?

Slaves from the various villages and towns far away.

Explanation:

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The Portuguese built the Elmina Castle in 1482, which is now at the present day western coast of Ghana. it was adjudged as the first slave-trading post in all of sub-saharan Africa in thousands of enslaved people are placed in dark dungeons before they were being transported to the Americas.

It was recorded that, by the 18th century, about 30,000 slaves on their way to North and South America passed through Elmina's Door of No Return each year.