[Wuli]

You ar probably right. The portland cement part of cement would likely have to have some portion of its ingrediaents imported, but then local sources might be available for the sand and gravel needed to be bound by the portland cement (cement is often a mix of portland cement, sand and gravel).

“By mass, lime and silica make up approximately 85% of portland cement. The materials that are commonly used are limestone, shells, chalk, shale, clay, slate, silica sand, and iron ore. Since limestone is the main component, often cement plants are located near limestone quarries.”

that from a wiki entry

[palmer]

The Bahamas has some limestone. They will need to import the natural gas to calcinate the limestone.

And diesel for the excavation and crushers, etc.