The gold dredger including the digging system,the beneficiation system,the water supply system,waste ore abandoning system,deck machinery system,hull system,upside steel structure system and the electric system.Technically,the gold dredger can be divided into 3 kinds,the fixed chute,the tape chute and the round jigging machine. As to the digging ability,the gold dredger can be divided into these specifications as follows,15L,25L,40L,50L,100L,150L,200L,250L,300L.The following gives the working index.

The bucket volume(L)	The digging depth(M)				Minimum width of working face(M)	The digging volume( M³)	Total weight(t)
	Total thickness	Below Water		Above water
		Max	Min
15	5.5	5.0	1.5	0.5	20	≥15	15
25	6.5	6.0	1.5	0.5	25	≥25	27
40	7.0	6.5	1.5	0.5	28	≥40	37
50	7.5	6.5	2.0	1.0	30	≥45	50
100	11.5	10.0	2.5	1.5	35	≥90	70
150	13.5	12.0	2.8	1.5	45	≥135	95
200	16.0	14.0	3.0	2.0	50	≥180	115
250	18.5	16.0	3.4	2.5	55	≥225	150
300	23.0	20.0	4.0	3.0	60	≥260	190
400	30.0	26.0	5.0	4.0	70	≥340	240