PURPOSE: A placer gold mining machine for a barge is provided to dig out alluvial gold layers including alluvial gold existing on the sea by using the barge, and to transfer the dug alluvial gold sorts, then to separate the alluvial gold by using a separator, thereby easily performing an alluvial mining process. CONSTITUTION: A barge is installed. A frame(600) is disposed on the barge. A placer mining selector(500) is installed on the frame(600). A gravel selector(400) is disposed on the placer mining selector(500), and separates alluvial gold from alluvial gold layers by transferring the alluvial gold layers. A storage(300) is disposed on a side of the gravel selector(400), and stores the alluvial gold layers dug out from the bottom of the sea. The placer mining selector(500) comprises as follows. A mat(510) has predetermined width and length. A chain is installed in length direction on a side of the mat(510). A gear is hooked over the chain. Rotative rollers(560) rotate the gear. An angle fixes the mat(510). Nozzles(540) spray water.
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