What's the difference between dredging and placer?

Dredging


Definition:

  • (p. pr. & vb. n.) of Dredge

Example Sentences:

  • (1) If Queensland goes ahead and develops and dredges Abbot Point, it may all be for nothing.
  • (2) The previous government advanced five major dredge projects involving dumping in the marine park,” he said.
  • (3) Documents obtained under freedom of information reveal huge uncertainty over the investment needed to maintain water quality following dredging to expand the Abbot Point port, north of Bowen in Queensland.
  • (4) A recent study suggests that coral disease is doubled when dredging occurs near reefs, although supporters of the dredging have repeatedly insisted it can be done safely and that the Abbot Point sediment will be dumped around 40km from the nearest reef.
  • (5) They want to send a very clear message to China that they are serious about this.” Facebook Twitter Pinterest This image from the US navy purportedly shows Chinese dredging vessels in the waters around Mischief reef in the disputed Spratly archipelago in May 2015.
  • (6) In ongoing lawsuits objecting to the island reclamation scheme , the Jakarta Legal Aid association has argued these new islands are occupying traditional fishing grounds, while the sediment and dredging work have driven away fish from the remaining waters.
  • (7) Dredging creates turbidity in the water that reduces the amount of light reaching the coral, affecting photosynthesis, while silt that settles on the coral interferes with its ability to feed itself.
  • (8) | Howard W French Read more In the South China Sea, China has, by massive dredging operations, turned submerged reefs with names out of the novels of Joseph Conrad – Mischief Reef, Fiery Cross Reef – into artificial islands, and is completing a 3,000m runway on Fiery Cross.
  • (9) Dover Harbour Board has applied for a licence to dredge Goodwin Sands, which had been proposed as a marine conservation zone, for aggregate to be used in the expansion and development of Dover port.
  • (10) We would like to see the dredging – if it does take place – it doesn’t take place in important times in seal biology.
  • (11) However, a local campaign called Save Our Sands has been established in an attempt to stop the dredging from happening, and has gathered more than 5,500 signatures on an online petition to prevent it.
  • (12) Barton rubs Old Firm up the wrong way Joey Barton apologises ‘unreservedly’ after being sent home by Rangers Read more The phrase “Joey Barton Twitter storm” is pretty much a tautology, so it was no surprise that his decision to sign for Rangers in May had social media in a kerfuffle when his 2012 tweet – “I am a Celtic fan” – was dredged up so that it might be subject to calm and sober scrutiny from all concerned.
  • (13) So let's end the simplistic nonsense that leads us to focus only on concrete defences and destructive dredging, and instead take what is ultimately a more rational and integrated approach.
  • (14) It exacerbates an environment of disaffection and disempowerment and does nothing but isolate the very community that best understands these challenges.” Race relations have reached a low ebb following the release of the government’s anti-terrorism laws, which many Muslims say have dredged up Islamophobia in the community by equating terrorism with Islam.
  • (15) Rooke said dredging was part of the solution, "but not the whole solution".
  • (16) Using satellite imagery, researchers could map the areas of coral covered by plumes of sediment released by the dredging process.
  • (17) In between taking up the rice harvest and dredging his irrigation canals, however, he must contemplate a new threat to his family and livelihood, one that may well prove more deadly than any of Egypt's previous invaders.
  • (18) The site, called Reef Facts , addresses the contentious decision to allow the dredging and dumping of 5m tonnes of seabed sediment within the Great Barrier Reef marine park in order to expand the Abbot Point port.
  • (19) However, the Whale and Dolphin Conservation Society said electronic pingers could already be used under current EU nature laws, which also protect porpoises from trawling, dredging, pile driving and noise from military sonars.
  • (20) The case has dredged up painful memories for other victims of child abuse, who are now also coming forward in their hundreds to seek counselling.

Placer


Definition:

  • (n.) One who places or sets.
  • (n.) A deposit of earth, sand, or gravel, containing valuable mineral in particles, especially by the side of a river, or in the bed of a mountain torrent.

Example Sentences:

  • (1) Placers were both the most advantaged socioeconomically and held the most positive attitudes toward adoption, while young women who never considered adoption were the least advantaged and held the least favorable attitudes.
  • (2) They were reached as placers of sadomasochistic contact advertisements or as members of sadomasochistic clubs.
  • (3) Total and total recoverable copper concentrations reported in five Alaskan streams with active placer mines were higher than the acutely toxic concentrations, either individually or in mixtures, that the authors found to be acutely toxic to Arctic grayling and coho salmon from Alaska.
  • (4) Using FACES II as the measure of family cohesion and adaptability, it was hypothesized that: (1) adolescent parents or placers would describe their families as being less functional than adolescent norms, (2) adolescents who placed their children for adoption would describe their families as being more functional than adolescents who parented their children, and (3) adolescents from the more functional families would report greater satisfaction with the placement decision than those from less functional families.
  • (5) Using FACES II as the measure of family cohesion and adaptability, it was hypothesized the: 1) adolescent parents or placers would describe their families as being less functional than adolescent norms; 2) adolescents who placed their children for adoption would describe their families as being more functional than adolescents who parented their children; and 3) adolescents from the more functional families would report greater satisfaction with the placement decision than those from less functional families.
  • (6) However, caution should be used when comparing our results obtained in "clear" water to field situations, because speciation and toxicity of these inorganics may be altered in the presence of sediments suspended by placer mining activities.
  • (7) Results indicate that Hypothesis 1 was supported, but contrary to Hypothesis 2, there were no significant differences in family functioning between placers and parents.
  • (8) Based on the results of the present study, estimated no-effect concentrations of arsenic and mercury, but not cadmium, chromium, gold, nickel, selenium, or silver, are close to their concentrations reported in streams with active placer mines in Alaska.
  • (9) Adolescents who placed their babies had significantly lower scores on the role-reversal measure, but the differences between keepers and placers on the expectations, empathy, and corporal punishment dimensions were not significant.
  • (10) The acute toxicity of nine inorganics associated with placer mining sediments to early life stages of Arctic grayling (Thymallus arcticus), coho salmon (Oncorhynchus kisutch), and rainbow trout (O. mykiss) was determined in soft water (hardness, 41 mg liter-1 CaCO3) at 12 degrees C. The relative toxicities of the inorganics varied by four orders of magnitude; from most toxic to least toxic, the rank order was cadmium, silver, mercury, nickel, gold, arsenite, selenite, selenate, and hexavalent chromium.
  • (11) Placers consistently reported that their choice to place their babies rather than parent would increase the likelihood of outcomes such as continuing with school, having enough money to live comfortably and benefiting the baby's emotional development, while those young women who did not consider adoption tended to feel that these outcomes would be more likely if they parented, or that the likelihood of the outcomes would not be affected by their choice.
  • (12) The level of family or origin functioning of adolescent parents and placers is even less frequently studied.
  • (13) The level of family of origin functioning of adolescent parents and placers is even less frequently studied.
  • (14) Thus, arsenic (as arsenite(III)) and mercury may pose a hazard to Arctic grayling and coho salmon in Alaskan streams with active placer mines.
  • (15) In tests with environmentally relevant mixtures (based on ratios of concentrations measured in streams with placer mining) of these four inorganics, copper was identified as the major toxic component because it accounted for greater than or equal to 97% of the summed toxic units of the mixture, and an equitoxic mixture of these inorganics showed less-than-additive toxicity.
  • (16) For the most captivating of second-placers the challenge now is simply to make their excellence count in more tangible ways.
  • (17) The acute toxicities of four trace inorganics associated with placer mining were determined, individually and in environmentally relevant mixtures, to early life stages of Arctic grayling (Thymallus arcticus) from Alaska and Montana, coho salmon (Oncorhynchus kisutch) from Alaska and Washington, and rainbow trout (Oncorhynchus mykiss) from Montana.