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Gold Dredge, Klondike River, Canada, 1915 The Yankee Fork dredge near Bonanza City, Idaho, which operated into the 1950s. A gold dredge is a placer mining machine that extracts gold from sand, gravel, and dirt using water and mechanical methods. The original gold dredges were large, multi-story machines built in the first half of the 1900s.
A hand tool is any tool that is powered by hand rather than a motor. [1] Categories of hand tools include wrenches, pliers, cutters, files, striking tools, struck or hammered tools, screwdrivers, vises, clamps, snips, hacksaws, drills, and knives. Outdoor tools such as garden forks, pruning shears, and rakes are
The principle of using a helping hand requires the fixation of a work piece, so that the user can use his body or extremities with total freedom of movement. A similar example is a vise . There are various types of hand tools and similar instruments for assistance or temporary support for work, crafts and even for other tools, such as:
Hand steel is mining with the use of a chisel-like tool. The chisel is struck violently with a striking tool, usually with a sledgehammer. It is one of the several mining techniques used in traditional mining and one of the several with the use of basic hand tools. Hand steel was used in the 19th and 20th centuries for surface and underground ...
A grab dredge. Dredging is the excavation of material from a water environment. Possible reasons for dredging include improving existing water features; reshaping land and water features to alter drainage, navigability, and commercial use; constructing dams, dikes, and other controls for streams and shorelines; and recovering valuable mineral deposits or marine life having commercial value.
[19] [20] [21] The Hartley and Reilly Dredge had mixed success; it was mining Hartley's Beach when a drunken dredge-hand let the ladder down out of control crashing through a hard pan into an underlying layer richer in gold than Hartley and Reilly's original discovery. In a single week the dredge recovered £5000 worth of gold. [22]
Dredging - There are types of dredges used for collecting scallops, oysters or sea cucumbers from the seabed. They have the form of a scoop made of chain mesh and they are towed by a fishing boat. Dredging can be destructive to the seabed, because the marine life is unable to survive the weight of the dredge.
Airlift dredging. An airlift is device based on a pipe, used in nautical archaeology to suck small objects, sand and mud from the sea bed and to transport the resulting debris upwards and away from its source. It is a type of suction dredge. A water dredge or water eductor may be used for the same purpose. [1]
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