
	Where results make sense

Topic: Hard rock mining

Related Topics

Surface mining

Mining

Strip mining

Mining accidents

Coal mining

Hard rock

Mining Act of 1872

Ore grade

Argyle diamond mine

Mine fire

Placer mining

Acid mine drainage

Drift mining

Shaft mining

Placer deposit

In the News (Wed 25 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Hard Rock Mining
		Hard rock mining is a kind of underground mining.
		When the mine owners and the engineers decide that they will stop taking coal from the mine, they do something called "robbing the pillars." This means that as they back out of the tunnels, they take the coal out of the pillars that hold up the roof.
		Hard rock mining is one of the most dangerous kinds of mining.
	library.thinkquest.org /05aug/00461/hard.htm (470 words)

	Hard rock mining process
		Since the costs can be high in the exploration and removal of gold from the hard rock mines, large companies are created in order to raise the money necessary for the development of the mines, rather than the solitary individual or small group associated with placer mining.
		Mining for gold is only worthwhile financially where there is a significant concentration of it found in ore. The fixed price of gold in 1934 increased from $20.67 U.S. to $35 U.S. per troy ounce.
		Before hard rock mining operations have even begun, companies explore areas where gold may be found and scientifically analyse the rock.
	www.energymanagertraining.com /mining/hard_rock_mining_process.htm (811 words)

	Hard rock mining - Wikipedia, the free encyclopedia
		Hard rock mining is used for mining many ore types such as gold, copper, zinc, lead, and diamonds.
		The deepest hard rock mine in North America is Inco Limited's Creighton Mine, which mines nickel ore in the Sudbury Basin, Ontario.
		The deepest hard rock mines in Australia are the copper and zinc lead mines in Mount Isa, Queensland at 1,800 m.
	en.wikipedia.org /wiki/Hard_rock_mining (803 words)

	FRAN CHERRY
		The BLM is aware of the potential for this opinion to place constraints on large mining operations and associated support facilities, such as mills, waste rock disposal, tailings ponds, and transportation facilities.
		Mining is the second largest industry in Nevada, and BLM employees in the state have workloads to prove it.
		Through the 1980s and 1990s, the state saw a boom in gold and silver mining, although there was a slight downturn in the latter part of the 1990s and early 2000.
	www.doi.gov /ocl/2003/hardrockmining.htm (1789 words)

	An Introduction to Geology and Hard Rock Mining
		Rocks are classified not only according to their mineral content, but also in accordance with their mode of formation (igneous, sedimentary, metamorphic), chemical composition, grain-size, and physical appearance.
		Rocks which become deeply buried are subjected to heat and pressure, which with the aid of contained or introduced fluids, and tectonic forces are metamorphosed.
		Land requirements are dependent upon whether mining operations are underground or open-pit, lateral extent of the orebody, and percentage of gangue within the ore that must be discarded as waste, and the topography.
	www.rmmlf.org /SciTech/Lacy/lacy.htm (14588 words)

	Hard Rock Abstracts
		As mining of the primary pillars progressed, large portions of the overburden load was transferred into remaining pillars and later into the backfill adjacent to active mining operations.
		The crown pillar, defined as the rock remaining between the uppermost extent of mining and the base of surficial glacial deposits, is to be left in place to protect the surface and the glacial aquifer system.
		Mine roof falls identified on the mine map were tabulated and categorized according to size and orientation and, where possible, by other distinguishing features such as jointing or water pressure.
	www.agapito.com /hard_rock_abstracts.htm (3958 words)

	Hernando: Mining, rock industries carve sizable roles
		Mining officials interviewed by the St. Petersburg Times all described a healthy local industry that is riding the building boom to steady profit.
		Below the hard rock lies soft-rock limestone, which is used as a base material for roads and to make cement.
		Then an analysis was done of the available reserves, and it was found that enough hard rock remained to allow mining to continue into the middle of the next decade.
	www.sptimes.com /2005/02/13/Hernando/Mining__rock_industri.shtml (681 words)

	Non-Explosive Mining Systems for Hard Rock Mines
		The common mining method in hard rock underground mines is drilling and blasting.
		The in-vein sublevel stoping method originally proposed for Milldam Mine was seen to be unsafe due to the incompetence of the vein and the minor hardness of the fluorspar.
		A non-explosive mining system for underground hard rock mines was developed by researchers of the Imperial College (London), the Institut für Angewandte Geowissenschaften I, Fachgebiet Bergbaukunde (Berlin) and engineers of the diamond tool manufacturer Diamant Boart (Brüssel) and Laporte Minerals Milldam Mine (Sheffield) supported by the European Union.
	www.tu-berlin.de /~bg/projects/rip-e.htm (3122 words)

	Hard Rock Mining and Petroleum
		The mining of gold and silver led to the mining of lead, zinc, and copper.
		To be of value, mineral deposits must be mined, milled, smelted, transported, and sold for a profit.
		Therefore, extensive commercial mining in Utah had to wait until the completion of the transcontinental railroad in 1869.
	historyresearch.utah.gov /guides/hardrock.htm (817 words)

	NM Environmental Law Center
		The Law Center has been working hard for years with many of our clients to stop the degradation of New Mexico's environment by hard rock mining, or to win the best possible protection of the environment through suits filed for our clients.
		Because the Act is the strongest such statute in the Western United States, mining activists and mining companies throughout the West are closely watching the cases in which the Network is engaged to see if the state agencies and courts will support environmentally-sound interpretations of the Act's language.
		The bonding story at the Phelps-Dodge mines in the southwest part of the state is yet to be played out, but will surely be influenced by the Molycorp precedence, as well as the ongoing work of the Network.
	www.nmenvirolaw.org /cases/nmminingact.htm (1704 words)

	Hard Rock Mining - Nuggethunting Forums
		It concerned the nite shift at the Gold Crown Mine in the Dale District in Riverside County(see attached picture).
		One nite the old boy with the owl had left the bird down on the 400 foot drift and while these 2 newbbies were swiping the rails the owl came down out of the stope and landed on the hardhat of one of the men.
		Just about the same time that this was going on, his partner jumped backwards and landed on the shovel blade and up comes the shovel handle and nails his friend right in the crotuch.
	www.nuggethunting.com /forums/index.php?showtopic=2137 (454 words)

	Mining: The Hard Rock Mining Process
		Mining for gold is only worthwhile financially where there is a significant concentration of it found in ore.
		The intersection Midlake Tunnel and raise in the Island Mountain Mine
		The rock fragments are sorted according to size in a grizzly, a device consisting of a series of spaced bars, rails, or pipes, above a forward moving conveyer belt to a crusher machine.
	wells.entirety.ca /mining.htm (812 words)

	Rivers Council of Minnesota
		State law makes it clear that hard rock mining is not allowed in the area protected by the state's Wild and Scenic Rivers Act, where the quarry is located, according to Anderson.
		Several counties adjacent to the river claim the exemption to mine sand and gravel should be interpreted to include hard rock, at a time when the state is running low on construction rock.
		But environmental groups say hard rock mining in the area is scarring a beautiful part of the state.
	www.riversmn.org /sentinel_mn.html (4487 words)

	Gold mining - Wikipedia, the free encyclopedia
		Gold mining consists of the processes and techniques employed in the removal of gold from the ground.
		Rock broken by the explosion is then removed from the area, typically with mechanized equipment.
		This was seen in the environmental disaster in Central-Eastern Europe in year 2000, when during the night of 30 January, a dam at a goldmine reprocessing facility in Romania released approximately 100,000m³ of wastewater contaminated with heavy metal sludge and up to 120 tonnes of cyanide into the rivers of Tisza and Danube.
	en.wikipedia.org /wiki/Gold_mining (900 words)

	Mining
		Mining, whether for gold or gravel, usually takes place in or near streams and creeks, and salmon use the same waterways for spawning and rearing.
		Even in the case of underground, or hard rock, mining, water from streams was needed to wash the mined material.
		Today, mining streams for precious metals is pretty much limited to what state officials call recreational and part-time mining, which is done by citizens who prospect for gold in their spare time.
	eesc.orst.edu /salmon/human/mining.html (1206 words)

	Easing of rules a boon for hard-rock mining / Clinton environmental regulations being erased
		The revisions, which apply to hard-rock mining operations on federal lands, could result in a revival of sorts for the mining industry in California, mining advocates and critics agree.
		The nation's principal mining law, which is little changed since it was enacted in 1872, was designed to promote mineral exploration and development on federal lands, granting free access to prospect for minerals and, if someone struck ore, to stake a claim.
		The gold mining operation's proposal for a mine 15 miles northwest of Yuma, Ariz., in Southern California was blocked by the Bureau of Land Management in the final days of the Clinton administration last January.
	www.sfgate.com /cgi-bin/article.cgi?f=/c/a/2001/12/28/MN96134.DTL (865 words)

	Hard-Rock Mining Contamination
		Mine dumps, tailing piles, and unmined mineral deposits can contaminate the surrounding watershed when weathering of exposed minerals causes acid drainage and metals-enriched waters.
		The Fifth International Conference on Acid Mine Drainage, Denver, Colorado, May 21-24, 2000 was co-sponsored by the Toxics Program.
		Hard Rock Mining Contamination in Arid Southwest Alluvial Basins -- Pinal Creek, Arizona
	toxics.usgs.gov /topics/minelands.html (432 words)

	Otago Gold: Hard-rock mining, Geology Department, University of Otago, New Zealand
		Historically, hard-rock mining was a minor part of the gold mining industry in Otago because it is a very capital-intensive process.
		The problem of high technology and poor recovery in hard rock mining persists to the present.
		The Macraes mine near Dunedin is a technically advanced and highly capitalised operation which uses cyanide to extract gold.
	www.otago.ac.nz /Geology/features/gold/hard-rock.htm (743 words)

	USATODAY.com - New mining rules reverse provisions (Site not responding. Last check: 2007-10-13)
		The Bush administration unveiled new regulations Thursday governing mining on federal lands, stripping regulators of the authority to veto mines they fear would cause "substantial irreparable harm" to the environment.
		In announcing the new rules, which cover "hard rock" minerals such as gold and silver, Bureau of Land Management (BLM) spokesman Larry Finfer described them as making "surgical changes" in the regulations issued by the Clinton administration.
		In conjunction with the new rules, the Interior Department is moving to reverse a decision by former Interior secretary Bruce Babbitt denying a permit for a gold mine in southeastern California.
	www.usatoday.com /news/nation/2001/10/25/mining.htm (417 words)

	Mining Technology - Brooks Range Exploration II - Hard-rock and Placer Mining Site
		Gold was first mined in the central part of the district in 1904, following discovers near Wild Lake and on Crevice Creek in the John River drainage.
		In one mining season, 15 assays arrived with the samples, one tag for each, with a value of 0.5oz of gold per ton to 44oz of gold per ton.
		Access to the 9,500acre mine is available by utilizing a winter trail, gravel runway or the use of a seaplane.
	www.mining-technology.com /contractors/project/brooks (638 words)

	Hard Rock Mining
		The decision, which was approved by Interior Secretary Gale Norton, attempts to nullify a limit on mine dumps set in federal mining law.
		The hard rock mining, coal mining and oil and gas industries claim that they are unable to get surety bonds, and that federal rules need to be weakened in response to this "crisis."
		Hard rock mining firms are among the international corporations pushing for free trade agreements that undercut the ability of local, state and national governments to protect the interests of their citizens.
	www.worc.org /issues/mining.html (520 words)

	New roadheader concept for hard rock mining
		A high technology hard rock cutting machine developed by a consortium of European organisations is finding a ready application in the European mining industry.
		The aim was to realise the advantages of mechanical cutting with roadheaders in rock materials up to 200MPa compressive strength by developing new tools and new cutting technology.
		Grades of tool are available for hard and abrasive rocks, ordinary tunnelling and coal, and hard but less abrasive conditions.
	www.ferret.com.au /articles/5a/0c00e15a.asp (248 words)

	Trollope Mining Services \| Johannesburg \| Gauteng \| South Africa - hard rock mining, hard rock mining south africa
		South Africa - hard rock mining, hard rock mining south africa
		The Modderfontein and Grootvlei opencast mining projects, situated in the Benoni and Springs areas, was concluded from 1999 - 2005.
		hard rock mining, hard rock mining south africa
	www.tmsgroup.co.za /modderfontein-coal-mining.html (122 words)

	Amazon.com: Mining the Hard Rock: Books: John Marshall (Site not responding. Last check: 2007-10-13)
		Buy Hard Rock Tickets Online — TicketsGuaranteed.com has tickets for the Hard Rock Hotel in Las Vegas, along with a huge selection of other events throughout the country.
		The book is full of photographs and interviews that paint a real picture of what life was like for the men who worked the mines, and the mothers, wives, and daughters who lived with them in these isolated and rugged communities.
		This book is a must-read for anyone interested in the history of the Southwest, or the history of hard rock mining.
	www.amazon.com /Mining-Hard-Rock-John-Marshall/dp/0963202820 (666 words)

	NMBGMR FAQ: Mining
		Rock containing minerals in sufficient concentration, quantity, and value to be mined at a profit.
		Most rocks contain trace amounts of uranium (bulk concentrations on the order of 2 to 4 parts per million), however, uranium is not distributed uniformly through rocks, but tends to be concentrated in certain minerals.
		Certain large mining districts, such as the Magdalena mining district in Socorro County, are filed in a special collection that consists of geologic reports, maps, photographs, production data, and historical information associated with each district.
	geoinfo.nmt.edu /faq/mining/home.html (1128 words)

	Empire Mine, Nevada County
		The work was hard, and very dangerous (as most of the shafts resembled water wells, instead of mines), cave-ins were frequent and many became discouraged and sold their claims.
		The greatest contributing factor to the success of Nevada County's hardrock mining, came from the influx of folks from Cornwall, England, where copper and tin mining had been going on for over a 1,000 years.
		During its run, the mine took out approximately 5.8 million ounces of gold, and there was about 400 miles of underground passages dug to get the gold out.
	www.778.com /sights/empire (359 words)

	Investigations - Watershed Contamination from Hard Rock Mining
		Watersheds affected by active and/or abandoned hard rock mining (HRM) often have hundreds of mining-related sites with little information on their relative significance as sources of metals contamination and acid mine drainage.
		The overall goal of HRM research is to provide improved information and tools to support decisions related to management, risk assessment, remediation planning, and mitigation of the anthropogenic effects of mine drainage on the surrounding watersheds and ecosystems.
		The principal research objectives are to a) characterize hydrologic and biogeochemical processes that affect dispersal of metals and associated contaminants and b) describe contaminant pathways to organisms.
	toxics.usgs.gov /investigations/hardrock_mining.html (538 words)

	deseretnews.com \| Hard-rock mining banned
		Also included are 20 miles of the Dolores River from the Utah/Colorado border to the confluence with the Colorado River, and a 120-mile stretch of the Green River that ends at the boundary of Canyonlands National Park.
		Wisely said it has been 50 years since a commercial hard-rock mining claim has operated along these corridors, but there are currently 101 placer claims and two lode claims in those areas.
		Norton maintained that the rock mining protection could prevent situations requiring environmental cleanups, such as one in Westwater Canyon caused by a placer mining operation.
	deseretnews.com /dn/view/0,1249,595090727,00.html (712 words)

Try your search on: Qwika (all wikis)