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Mining Sand and Gravel
Source: Chemical Processing The protection of the Shenandoah River and the reclamation of valuable zinc hydroxide were both achieved by Avtex Fibers, the nation’s largest producer of rayon fibers, through the use of a portable sediment remover. For years, Avtex had pumped zinc hydroxide, a by-product of their manufacturing process, into settling ponds surrounding the plant. The settling ponds located at Avtex’s Front Royal plant in Virginia suddenly started to fill up with sludge and sediment – valuable sediment – since it was determined that if the zinc hydroxide could be reclaimed it could be processed into useful zinc sulfate....
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Owner – Mineracao Taboca, Brazil PRINCIPAL PARTICULARS: PRINCIPAL PARTICULARS: “Stelinha V” “Stelinha VI” “B890E” Hull Size – length in feet 110′ 81′ 56 Maximum Digging Depth 36′ 26′ 21′ Suction Pipe Size – ID 16″ 14″ 10″ Discharge Pipe Size – ID 16″ 14″ 10″ Dredge Pump Horsepower 500 600 350 Excavator Horsepower 250 100 40 Total Installed Horsepower 1000 850 420 PROJECT INFORMATION: By far the largest number of dual-wheel excavators on a single site are working in the western world’s richest tin mine at Pitinga, in Brazil’s Amazon basin. Located over 300 km northeast of the Amazon River...
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Source: World Dredging Mining & Construction Over the years a wide range of physical tests have been developed to allow prospective gold mining organizations to analyze various aspects of intended mine areas. These tests vary depending on the intended method of extraction. In the case of dredges, specifically wheel excavator equipped dredges, the following tests for evaluation are required: A full granularmetric curve which is representative of the entire ore body is required, particularly if the body might contain material which is beyond the capabilities of the dredge to excavate or transport. To generate the information satisfactory to present this...
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Source: World Dredging Mining & Construction In a remote region of northwest China, mining of salts containing Mirabilite began in 1958, supporting a small village. The Xingjiang Salt Lake Chemical Plant, in China’s Xingjiang Province, is located about 70 km east of the city Urumqi. Mining was conducted initially with backhoes and fed a small processing plant. In addition to Mirabilite, other salts are extracted and used in China’s commercial industry. In the 1980s the dredging industry was starting to gain a position in furnishing bucketwheel suction dredges to the mining industry. In the mid 1980’s, with the help of...
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Ellicott® International sold a bucketwheel dredge to a Brazilian company for gold mining in the Amazon. Mineracao Trans Amazonica (MTA) placed the Ellicott® Brand B890 “Wheel-Dragon™” dredge in service near the Paru River west of Jari in the vicinity of Monte Dorado, Brazil.
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Heavy mineral mining is made up of several individual stages or sequences of operation. These stages are described below in order of occurrence. Clearing Initially, all marketable timber is harvested from the immediate mining area. Stumps, undergrowth and remaining brush are then collected and piled by crawler tractors. This material is allowed to dry and later burned. Topsoil is then removed to a depth of 6-8 in and either stockpiled for deposit later or placed directly on an adjacent mining cut. This work is accomplished by a 23-yd3 four-wheel-drive pan scraper. Dredging The ore is mined with a custom-designed Ellicott®...
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Source: World Dredging & Marine Construction Ellicott® brand custom-built hydraulic pipeline cutterhead dredges are being used increasingly in mining and aggregate operations ranging from coal to tin to aggregates. Coal Recovery In the coalfields of eastern Pennsylvania, coal fines once considered impractical to salvage were recovered by an Ellicott® brand suction cutterhead dredge. Because of the operations, up to 30 railroad cars, a day of coal were recovered, enabling a power utility to have a ready supply of low-cost fuel for its steam generators. The dredge worked from a cut more than 185 feet deep where it was estimated that...
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Source: Highway & Heavy Construction Magazine Two large hydraulic dredges, teamed with smaller floating units and shore-based draglines, averaged about 60,000 cu.yd. of dredging per day while quickly clearing four miles of the ash-laden Cowlitz River following the eruption of Mt. St. Helens. But dismantling the big dredges, transporting them and reassembling and launching them took five weeks. Canonie-Bultema Pacific Corp., a subsidiary of The Canonie Companies, Inc., South Haven, Michigan, used a marine-based approach while clearing about 4.4 million cu.yd. of sandy sediment from the Cowlitz River under two back-to-back contracts for the Corps of Engineers. The contracts were...
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Source: Asia Pacific Mining Marcopper’s porphyry copper open pit mine is located near the geographic center of the island province of Marinduque in the Philippine archipelago. The 780 square kilometer island is 170 kilometers south of Manila. (Marcopper was until recently a subsidiary of Placer Dome.) Marcopper Mining Corporation was commissioned with a rated mill capacity of 15000 tonnes per day. Mill tailings were disposed of into the nearby San Antonio valley 4 kilometers from the concentrator. Two dams were built with compacted laterite at both ends of the valley to form an impoundment or basin. The main part of...
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Source: International Dredging & Port Construction Principal particulars of the “COOLJARLOO I” Digging depth max 25 m, min 4.6 m Dredge pump Ellicott® 24 in. Pump horsepower 2,000 HP (1491 KW) Dry weight approx 2,700 tons Shore power supply 22,000V/3-ph/6047 Suction pipe diameter 23.52 in. Discharge pipe diameter 23.62 in. Total installed power 4,100 hp (3057 KW) Ellicott Machine Cooperation of Baltimore, Maryland completed a turnkey project to design and build what is believed to be the world’s largest-ever mineral sand mining dredger. Christened “COOLJARLOO I”, the bucketwheel dredger was built for heavy minerals mining in Western Australia. And with an overall...
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