Dredging (Leaving Cert Engineering): Flashcards
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Practise the cards
13 cards from this deck
Dredging definition
Dredging definition
Mining method extracting metal ores from underwater locations
Spuds in dredging
Spuds in dredging
Vertical support posts anchoring the vessel in position
Wash-plants
Wash-plants
Onboard facilities separating valuable ores from waste
Placer deposits
Placer deposits
Valuable minerals concentrated by natural water action
Three phases of dredging
Three phases of dredging
Collection, Processing, Disposal
Materials extracted by dredging
Materials extracted by dredging
Gold, tin, sand/gravel, rare earth minerals
Water quality impact of dredging
Water quality impact of dredging
Creates muddy water, reduces visibility & oxygen levels
Ecosystem disruption from dredging
Ecosystem disruption from dredging
Destroys habitats for fish, plants & aquatic organisms
Siltation effect
Siltation effect
Fine particles settle, blocking sunlight for underwater plants
Visual impact advantage of dredging
Visual impact advantage of dredging
Less visual impact on landscape vs open-pit mining
Major environmental concern in dredging
Major environmental concern in dredging
Significant impact on aquatic ecosystems
Bucket-wheel system function
Bucket-wheel system function
Main extraction mechanism raised/lowered to different depths
Weather dependency in dredging
Weather dependency in dredging
Storms, winds & rough water halt operations