These dredges may also be employed very effectively to work in conjunction with excavator-fed floating trammel plants. Suction dredges are preferable for both sampling and for mining selectively on a small-scale. For larger operations, bulk mining in the lower reaches of rivers utilizes bucket dredges and suction-cutter dredges. And in recent years it has been proven that with the application of modern mining concepts, techniques and technology, rivers remain a valuable source of minerals! Modern methods of extracting minerals from rivers use diver-controlled suction dredges and excavator-fed floating trammel plants for mining in smaller-scale situations, along with shaking tables for further refinement and extraction.
Historically, rivers have yielded great quantities of gold, along with lesser amounts of tin and gemstones.
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