Transportation alone is well over U.S. 17 dollars per MT......
..........from DR to FL in 20,000MT + ships. 99% of all ships will NOT carry anything coming off a beach (salt contamination that rusts out holds)...which leaves you with mfg. the sand in crushers (no good for beach) or coming out of the rivers and screened with significant equipment and investment. Not just to screen the sand, but logistically to move the sand to port, load the ships, pay the duties, taxes, and port fees and then pay the transport fees and insurance. So if it going to happen, it will be done on a "large scale" with REAL PLAYERS (including permission within the Gov't.) not some "mom and pop" or "hatians with shovels" scenario.
"Everyone" is looking for large quantities of sand and gravel for projects in foreign countries....very, very few will actually "pay the price" to actually make it happen.