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Topic: Placer deposit

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	Placer deposit - Wikipedia, the free encyclopedia
		In geology, a placer deposit is a deposit of earth, sand, or gravel, containing valuable minerals in particles, especially by the side of a river, or in the bed of a mountain stream.
		Placer mining is an important source of gold, and was the main technique used in the early years of the California gold rush.
		Placer deposits form due to the differential settling of the denser, heavier components of moving sand and gravel.
	en.wikipedia.org /wiki/placer_deposit (223 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Deposit is 12 km southeast of Chonan in Sungnam and Sushin-myons, Chonan-gun, Chungchong-namdo.
		The alluvial placer is 3.5 km northwest Kumma-myon, Hongsoung-gun and Sapkyo-myon, Yaesan-gun, and Chunchong-namdo.
		The deposit overlies Precambrian schist that is intruded by coarse-grained Jurassic biotite granite and lamprophyre.
	geopubs.wr.usgs.gov /open-file/of03-220/DATABASE/placer_districts.txt (18252 words)

	Yukon Geological Survey-Surficial Geology & Placer Studies
		Placer gold deposits are widespread throughout the Stewart River and southern part of the Dawson map areas, and placer gold is the only mineral of economic importance to have been found (although there are rumors that platinum and diamonds have been recovered from several placers).
		However, placer reserves are declining, and given the historic and economic importance of the study area, the Yukon Geological Survey prioritized the development of a comprehensive and up-to-date description of the placer deposits.
		Other purposes of the project were to interpret the formation of the placer deposits, to relate the geology of the placer deposits to the regional surficial and bedrock geology, and to determine the potential of undiscovered placer deposits in the area.
	www.geology.gov.yk.ca /projects/surficial.html (2973 words)

	MINERAL DEPOSITS - Online Information article about MINERAL DEPOSITS
		When the copper ores are of low-grade in their original deposition it often happens that processes of secondary enrichment, which are later described, are required to bring them up to a richness which warrants mining.
		Deposits along Anticlinal Summits and in Synclinal Troughs.—When strata experience folding they are violently strained at the bends, and, if stiff or brittle like limestone, often crack in limited fissures, which in anticlines open upward and in synclines downward.
		Deposits in Faults.—This type of ore-body was one of the earliest established, and has always figured very prominently in the minds of students of the subject since the first systematic forrnulations of our knowledge.
	encyclopedia.jrank.org /MIC_MOL/MINERAL_DEPOSITS.html (7254 words)

	GOLD_HOW_RUN_PLACER (Site not responding. Last check: 2007-10-21)
		Streambed placers are the most important kind of deposit for the small-scale operator, but the gravel terraces and benches above the streams and the ancient river channels (often concealed by later deposits) are potential sources of gold.
		Other types of placers include those in outwash areas of streams where they enter other streams or lakes, those at the foot of mountainous areas or in regions where streams enter into broader valleys, or those along the ocean front where beach deposits may form by the sorting action of waves and tidal currents.
		Deposits are also found in the drainages of the Trinity and Klamath Rivers in northern California and at scattered points in the southern part of the State.
	www.iowagold.net /iowagolddotnet/HOWTOPAGES/gold_how_run_placer.htm (17005 words)

	placer. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. (Site not responding. Last check: 2007-10-21)
		A glacial or alluvial deposit of sand or gravel containing eroded particles of valuable minerals.
		A place where a placer deposit is washed to extract its mineral content.
		Spanish, shoal, placer, from Catalan placer, shoal, from plassa, place, from Medieval Latin placea.
	www.bartleby.com /61/33/P0343300.html (106 words)

	creation geology russia review (Site not responding. Last check: 2007-10-21)
		In their model they interpret the Precambrian placer deposits to have formed between the creation of the world 4004 BCE and the Flood (2300 BCE) (known amongst some creationists as the New World Era) and the Cainozoic placer gold deposits to have formed during the waning phase of Noah's Flood.
		By mentioning every significant, thought not necessarily economical, placer deposit in the Precambrian while focussing only on the amount of placer gold extracted from the Palaeozoic and Mesozoic sedimentary rocks, Lalomov and Tabolitch are deceptively stacking the results in their favour.
		In the case of placers this means that the gold is not present as detrital grains, the gold crystallised within the conglomerates from a mineralising fluid.
	home.austarnet.com.au /stear/creation_geology_russia_review.htm (2965 words)

	Gold mining definitions provided by HMMC. (Site not responding. Last check: 2007-10-21)
		A "bleed-off deposit" is the natural erosion of a bench placer, lode, mine dump, or tailing pile, etc., which over time releases gold, which enters into the streambed at some point, where there is a significant amount to allow a deposit to form.
		A braided stream is one flowing in several divided and reuniting channels resembling the strands of a braid; the cause of division being the obstruction of sediment deposited by the stream.
		Where more sediment is deposited into any part of a stream that is removed, the building of bars becomes excessive, and the stream develops an intricate network of interlacing channels; thus said to be braided.
	www.goldminershq.com /FRAME/FORMS/DEF1.HTM (2749 words)

	prospecting_template (Site not responding. Last check: 2007-10-21)
		Placers deposits are deposits of any heavy, resistant metals.
		Placer gold is any gold that has been freed from solid rock by weathering.
		Eluvial placers - The material weathered from the vein has now been carried away from the original site, usually by gravity as material works its way down a hill.
	www.marciesalaskaweb.com /webdesign/placer_definition.htm (181 words)

	Prospecting for Gold in the United States (Site not responding. Last check: 2007-10-21)
		However, most placer deposits have been thoroughly reworked at least twice--first by Chinese laborers, who arrived soon after the initial boom periods and recovered gold from the lower grade deposits and tailings left by the first miners, and later by itinerant miners during the 1930's.
		In addition, placers associated with gravels that are stream remnants from an older erosion cycle occur in the same general area.
		Placers in Colorado have been mined in the Fairplay district in Park County, and in the Breckenridge district in Summit County.
	pubs.usgs.gov /gip/prospect2/prospectgip.html (2849 words)

	placer deposit -- Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		Placer mining takes advantage of gold's high density, which causes it to sink more rapidly from moving water than the lighter siliceous materials with which it is found.
		Deposits of calcareous shells are dredged off the coast of Iceland and on the Great Bahama Bank in the Bahamas, and the shells...
		Where gold occurs in higher concentrations, the deposits are of two basic types—veins, or lodes, of gold-bearing ore, and placer deposits.
	www.britannica.com /ebc/article-9375371?tocId=9375371 (834 words)

	Encyclopedia: Placer deposit (Site not responding. Last check: 2007-10-21)
		A sluice box used in placer mining Placer mining (pronounced plass-er) is a open-pit or open-cast form of mining by which certain valuable minerals are extracted from the earth without tunneling.
		Black sand is a heavy, weakly magnetic, glossy, semi-metallic mixture of usually fine sands, found as part of a placer deposit.
		Magnetite is a ferromagnetic mineral form of iron(II,III) oxide, with chemical formula, one of several iron oxides and a member of the spinel group.
	www.nationmaster.com /encyclopedia/Placer-deposit (621 words)

	DMR - Mineral Resources - Gold
		A mineral deposit consisting of a zone of veins, veinlets, or disseminations; also, a mineral deposit in solid rock as opposed to a placer deposit
		The reflection of light from the surface of a mineral, described by its quality and intensity; the appearance of a mineral in reflected light.
		A superficial mineral deposit formed by mechanical concentration of mineral particles from weathered debris.
	www.mme.state.va.us /dmr/DOCS/MinRes/GOLD/glos.html (518 words)

	Placer deposit -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		Placer deposit -- Facts, Info, and Encyclopedia article
		The name is from the (The Romance language spoken in most of Spain and the countries colonized by Spain) Spanish word placer, meaning "pleasure", because placer mining is much easier than pick-and-shovel mining.
		There are heavy (A salt or ester derived from silicic acid) silicates, such (A mineral or mineral variety belonging to the amphibole group) amphibole and (Any of a group of crystalline silicate mineral common in igneous and metamorphic rocks) pyroxene that will collect in extensive placers where they comprise the country rock.
	www.absoluteastronomy.com /encyclopedia/p/pl/placer_deposit.htm (148 words)

	Read about Placer deposit at WorldVillage Encyclopedia. Research Placer deposit and learn about Placer deposit here! (Site not responding. Last check: 2007-10-21)
		Research Placer deposit and learn about Placer deposit here!
		Notably, placer environments typically contain fl sand, a conspicuous shiny fl mixture of iron oxides, mostly magnetite with variable
		amphibole and pyroxene that will collect in extensive placers where they comprise the country rock.
	encyclopedia.worldvillage.com /s/b/Placer_deposit (225 words)

	Gold Prospecting Streams
		Today's prospector must determine where prospecting is permitted and be aware of the regulations under which he is allowed to search for gold and other metals.
		For a specific tract of land, it is advisable to check the official land records at the proper BLM State Office.
		A placer deposit is a concentration of a natural material that has accumulated in unconsolidated sediments of a stream bed, beach, or residual deposit.
	store.goldfeverprospecting.com /goprst1.html (1273 words)

	EXPLO-MINE Ltd. - Services for small mining
		Our specialists elaborated and carried out high-volume regional projects on the prospecting and exploration of placer and primary deposits of gold (Burkina Faso, Ghana, Sudan, Congo-Brazzaville, Guinea).
		They also successfully realized detailed exploration of several placer deposits of staurolite, garnet and precious garnet (Czech Republic, Mongolia).
		Due to long-term experience in exploration and exploitation (treatment) of placers and primary gold ore we are ready to provide:
	www.explomine.com /index.php?lang=en&page=6 (317 words)

Placer deposit (Site not responding. Last check: 2007-10-21)

Placer deposit

Placer deposit
article at Free Euro Online Encyclopedia

It uses material from the wikipedia article Placer deposit.

www.eurofreehost.com /pl/Placer_deposit.html (163 words)

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In the News (Mon 7 Dec 09)