Placer gold is produced at the bottom of the river or in low-lying areas, so stones and sand are mixed together and gold is washed out. The placer gold mine originated from the mine. Because the gold ore is exposed on the ground, after a long period of wind and rain, the rock is weathered by the north wind and cracked, which makes the gold leave the vein with sediments, naturally deposit in the sand and deposit as a gold-bearing layer at the bottom of the river or under the sand, thus forming placer gold mine. The characteristics of placer gold are: the particle size is different, the big one is like broad bean, the small one is like fine sand, and the shape is different. The color varies with the fineness. More than 90% is red and yellow, eight is light yellow and seven is cyan yellow.

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