Open pit mine - Factbites

Open pit mine - Factbites
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Topic: Open pit mine

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Copper

	Northern Alaska Environmental Center :: Mining :: Open Pit Mining - Its Impacts
		With the exception of the Nixon Fork gold mine, which was an underground operation, and Red Dog, which is a very high-grade base metal deposit, all of these mines share the common trait of being bulk-tonnage, open-pit leach gold operations.
		Because these mines are essentially strip mines, huge quantities of uneconomical or un-mineralized rock are considered waste by the company, and permanently placed in huge rock dumps on-site.
		Since this mine had a projected mine life of about 16 years (although that has now shrunk to about half as a result of current gold prices), the mine property encompasses an area big enough to accommodate a 1,177 acre tailings impoundment and several huge waste rock dumps.
	www.northern.org /artman/publish/hard.shtml (402 words)

	Newmont Waihi Gold - The Open Pit
		In order to develop the open pit it is necessary to dewater the mine to ensure that the water level remains below the pit floor.
		At the modern Martha Mine site, rehabilitation of the open pit was an important part of the planning of the project.
		The pit will be a normal mining operation during its life, but post construction the mine will be allowed to fill to RL 1104 (mine datum) and a lake formed.
	staging.newmont.com /en/operations/australianz/waihigold/mining/openpit/index.asp (846 words)

	The Australian: Olympic Dam open pit boost [April 15, 2005]
		The expansion would involve an open pit producing 35 million tonnes of ore a year, and the existing underground mine would be downsized to produce 5 million tonnes of ore a year, compared with a current rate of 9 million tonnes a year.
		A $5 billion expansion of the massive Olympic Dam copper and uranium mine in South Australia would best be done through the development of an open pit, rather than a larger-scale underground mine, owners WMC said yesterday.
		Any expansion of Olympic Dam, host to 38 per cent of the world's uranium, is likely to face some fierce environmental opposition, and a proposal for an open pit is likely to stoke that opposition.
	www.theaustralian.news.com.au /common/story_page/0,5744,12858519%255E643,00.html (405 words)

	SouthCot firm eyes gold, copper open pit mining
		Open pit mine is "an excavation or cut made at the surface of the ground for the purpose of extracting ore and which is open to the surface for the duration of the mine’s life." To expose and mine the ore, it is generally necessary to excavate and relocate large quantities of waste rock.
		Open pit mines can be used in coal mining, and they are used extensively in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum, and many minerals.
		Anti-mining groups in South Cotabato claim open pit mining would eventually cause massive environmental degradation since the system itself entails the excavation of the mining area.
	www.mindanews.com /2003/10/28nws-mining.html (691 words)

	OPEN PIT MINING PLAN
		The company will mine the exposed silica deposit and silver vein to a depth of 300 feet, width of 150 feet, and length of 300 feet in PHASE I of the mining plan, producing an estimated 4000 tons per month of shippable ore or a minimum of 953,333 tons.
		At this time, Dane Mining and Exploration, LTD is negotiating with companies that will mine the Volcano Mine, taking advantage of its high silica, silver and gold values, and the market for decorative rock.
		The suggested "Greenfield" evaluation of the Volcano Mine by Mr.
	www.cs.utah.edu /~fish/volcano_mine/plan.htm (665 words)

	Death-Valley.us - Nation's toughest open-pit gold mining regulations considered
		The mine could leave an open pit 4,700 feet by 2,700 feet, and 800 feet deep, along with piles of waste rock a mile long and up to 300 feet high.
		The California State Mining and Geology Board's proposed regulations would require mining companies to refill all new open-pit metal mines, and provide financial guarantees so taxpayers wouldn't be stuck in the event the company defaults.
		If a mine fills with water, it can become a toxic lake that, unlike pits left by other mining, can never be used for recreation or wildlife.
	www.death-valley.us /article437.html (499 words)

	N.A. Degerstrom, Inc.
		Open-pit mining and crushing at the Getchell Mine for First Mississippi Gold Corp.
		Open-pit mining, crushing and agglomeration at the Beal mine for Pegasus Gold Company, near Anaconda, Montana.
		Produced preliminary design for Crows Nest Resources and feasibility studies for Mitsui Mining and Shell Canada, Ltd. for the Line Creek Coal mine near Fernie, B.C. The project was designed for a 20-year life at one million long-net-tons of metallurgical coal shipped per year.
	www.nadinc.com /about/history.html (796 words)

	SouthCot firm eyes gold, copper open pit mining
		Open pit mine is "an excavation or cut made at the surface of the ground for the purpose of extracting ore and which is open to the surface for the duration of the mine’s life." To expose and mine the ore, it is generally necessary to excavate and relocate large quantities of waste rock.
		Open pit mines can be used in coal mining, and they are used extensively in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum, and many minerals.
		Anti-mining groups in South Cotabato claim open pit mining would eventually cause massive environmental degradation since the system itself entails the excavation of the mining area.
	www.mindanews.com /2003/10/28nws-mining.html (691 words)

	McGraw-Hill AccessScience: Open pit mining
		n open pit mine or surface mine is an excavation or cut made at the surface of the ground for the purpose of extracting ore minerals or construction materials.
		Quarry is the general term for the open pit mines that extract materials such as sand, gravel, or limestone for use as construction materials.
		In the United States, the term open pit mine is used for mines that extract metals such as copper, gold, molybdenum, or iron.
	dx.doi.org /10.1036/1097-8542.YB980560 (160 words)

	High Country News -- October 3, 1994: Judge rocks Montana’s open-pit mines
		The law says reclamation of open pits "may not be feasible." Kim Wilson, an attorney representing environmentalists, describes the phrase as "a big glaring loophole" for most of the more recent open-pit mines in Montana.
		The Berkeley Pit in Butte, Mont., is a gigantic hole holding 17 billion gallons of toxic wastewater left over from the operation of an open-pit copper mine (HCN, 11/29/93).
		Relying only on a modified environmental assessment, the Department of State Lands approved expansion of the mine’s pit from 140 to 209 acres.
	www.hcn.org /servlets/hcn.URLRemapper/1994/oct03/dir/wr1.html (848 words)

	Nation's toughest open-pit gold mining regulations considered
		The mine could leave an open pit 4,700 feet by 2,700 feet, and 800 feet deep, along with piles of waste rock a mile long and up to 300 feet high.
		If a mine fills with water, it can become a toxic lake that, unlike pits left by other mining, can never be used for recreation or wildlife.
		The emergency regulations were prompted by Glamis Gold Ltd.'s proposal to mine federal land near the Fort Yuma Reservation of the Quechan Indian tribe near Winterhaven, on what the tribe considers sacred land.
	www.desertmines.com /news/031203.html (411 words)

	tilden
		On a recent February morning, pit dispatcher Dennis Trudgeon sat before a bank of computer screens in a building on the lip of the Empire Mine, using strokes on a keyboard to direct mining trucks to spots where they were needed in the huge open-pit mine.
		The life-of-mine stripping ratio in the hematite pit is about one-half to one, and in the magnetite pit it is about one to one.
		Though the 900-foot-deep pit was obscured in a sea of pea soup fog, Trudgeon could track the movements of the fleet of trucks, loaders and power shovels.
	www.geo.msu.edu /geo333/tilden.html (2758 words)

	Large scale slope stability in open pit mining: a review
		A case in particular is the Aitik open pit mine in northern Sweden, which currently faces the design of the overall slope angles for continued mining toward a depth of around 500 meters.
		In this report, the stability and design of large scale pit slopes in open pit mining is reviewed, with special reference to slopes in hard, jointed, rocks, similar to the rock types found at the Aitik mine.
		The factors governing large scale slope stability are primarily: (1) the stress conditions in the pit slopes, including the effects of groundwater, (2) the geological structure, in particular the presence of large scale features, (3) the pit geometry, and (4) the rock mass strength.
	epubl.luth.se /avslutade/0349-3571/96-10 (826 words)

	Open Pit Mining Engineering and Planning
		It is planned to mine approximately 5.0 Mtpa of high grade zinc ore from a large open pit with a maximum depth of almost 400 metres.
		One of the key issues for the project was to establish the optimum cut-off between the open pit and underground operations.
		Developing practical operating layouts to mine the ore, which although stratiform, is structurally complex due to the many faults that bound and intersect the mineralisation.
	www.golder.com.au /mining/ServicesOpenPitMinePlanningandMiningEngineering.htm (1233 words)

	Renseignements internationaux - Coeur plans open-pit mining at Cerro Bayo - Chile
		The US$5mn project will involve changing the mine plan to extract high-grade ore from the vein using open-pit methods, according to information handed into environmental regulator Conama.
		Idaho-based Coeur is also trucking stockpiled ore from the Martha mine in southern Argentina's Santa Cruz province to be processed at Cerro Bayo, a distance of 430km.
		US silver-focused company Coeur d'Alene Mines (NYSE: CDE) has submitted to Chilean authorities an environmental impact statement for permission to develop the Laguna vein at its Cerro Bayo gold-silver mine in southern Chile's Region XI.
	strategis.ic.gc.ca /epic/internet/inimr-ri.nsf/fr/gr111116f.html (463 words)

	Surface Mining/Open Pit Mining
		Open pit mines, however, require a lot of planning to make sure that as much ore as possible can be extracted.
		The planning of an open pit mine is an exercise in economics, constrained by geologic, and mining engineering aspects.
		Open pit design is conducted in several stages.
	www.dmtcalaska.org /course_dev/intromining/07openpit/notes07.html (1787 words)

	Analytical Data for Waters of the Harvard Open Pit, Jamestown Mine, Tuolumne County, California, March 1998 - September 1999
		A previous study of weathering of arsenian pyrite in similarly mineralized rocks at the Clio mine, in the nearby Jacksonville mining district, showed that arsenic released by weathering of arsenian pyrite is effectively attenuated by adsorption on goethite or coprecipitation with jarosite, depending upon the buffering capacity of the pyrite-bearing rock (Savage and others, 2000).
		The fact that arsenic concentrations increased rapidly before the pit lake was deep enough to stratify shows that arsenic may not be attenuated in the ways that the earlier Clio mine area study indicated, and suggested that our understanding of release and transport of arsenic in this environment is incomplete.
		The bottom of the pit is at an elevation of 870 ft (265 m).
	geopubs.wr.usgs.gov /open-file/of01-074 (612 words)

	Surface Mining/Open Pit Mining
		Open pit mines, however, require a lot of planning to make sure that as much ore as possible can be extracted.
		The planning of an open pit mine is an exercise in economics, constrained by geologic, and mining engineering aspects.
		To expose or mine the ore, it is generally necessary to move large quantities of waste rock.
	www.dmtcalaska.org /course_dev/intromining/07openpit/notes07.html (1787 words)

	Leica Geosystems - Open pit mining
		In the current method, a surveyor walks along the top and bottom of the mine wall to collet 3D points." The case study goes on to compare traditional pit mining surveying with 3D laser scanning, listing all of the benefits of this new technology in open pit mining.
		"PandM Coal currently uses labor intensive methods to calculate the volume of coal and material that is mined from its open pit coal mine in Kemmerer, Wyoming.
		To read more of the case study "Profiles and Volumes for Open Pit Mining," please click on the PDF icon at the bottom of the page.
	www.leica-geosystems.com /corporate/en/solutions/mining/lgs_1932.htm (101 words)

	Open Pit Mining Engineering and Planning
		It is planned to mine approximately 5.0 Mtpa of high grade zinc ore from a large open pit with a maximum depth of almost 400 metres.
		Golder has participated in many engineering and mine planning studies for open pit mines of all sizes from very large to very small.
		One of the key issues for the project was to establish the optimum cut-off between the open pit and underground operations.
	www.golder.com.au /mining/ServicesOpenPitMinePlanningandMiningEngineering.htm (1233 words)

	Surface Mining Method - Open Pit
		The typical large open pit mining operation that has been in production for 10 years and more is operating under conditions that could not possibly have been foreseen by the original planners of the mine.
		Although the basic concept of an open pit is quite simple, the planning required to develop a large deposit for surface mining is a very complex and costly undertaking.
		Blasthole assay control is especially desirable when exploration data are incomplete or lacking as in the case in the older pits which have long been mined past the limits of "ore" used in original planning.
	www.digistar.mb.ca /minsci/surf/openpit.htm (507 words)

	Open-Pit Mining
		The main cost advantage of open-pit mining is that the miners can use larger and more power shovels and trucks — the equipment is not restricted by the size of the opening it must work in.
		A stripping ratio of 3 to 1 means that during the life of the pit, there will be three times as much waste rock mined as ore. To be profitable, an open-pit mine must be designed so that the cost of mining the waste rock does not exceed the value of the ore.
		An open-pit mine is the least expensive kind, and is every developer’s first choice where an orebody is situated close to surface, is big enough, and has little overburden.
	www.miningbasics.com /html/open-pit_mining.html (633 words)

	United Kingdom - Open pit mining
		In the current method, a surveyor walks along the top and bottom of the mine wall to collet 3D points." The case study goes on to compare traditional pit mining surveying with 3D laser scanning, listing all of the benefits of this new technology in open pit mining.
		"PandM Coal currently uses labor intensive methods to calculate the volume of coal and material that is mined from its open pit coal mine in Kemmerer, Wyoming.
		To read more of the case study "Profiles and Volumes for Open Pit Mining," please click on the PDF icon at the bottom of the page.
	www.leica-geosystems.com /uk/en/lgs_1932.htm (101 words)

	RIOT: Open-Pit Mining: Introduction
		Although RIOT uses a two-dimensional mining simulation for demonstration purposes, the actual open-pit mining problem is three-dimensional.
		Constraints on the shape of your mine require that a block of earth (shown in yellow) cannot be excavated unless the three blocks above it (directly, and diagonally left and right) have also been excavated.
		Therefore, if your ore is deep in the mine, it may not be profitable to excavate it.
	ford.ieor.berkeley.edu /riot/Applications/OPM (309 words)

	Geotechnical Engineer Jobs - Mining/Open Pit/Optimization - Western, Canada Job Search -- Career Search
		Requires BS in Mining Engineering and a minimum of 5-8 years experience in open pit mining.
		Long Range Planning: Responsibilities includes a focus on maximizing the net present value of the company assets by optimizing the definition of ore, determining mineable pit limits, and identifying substantial technical enhancement opportunities.
		Requires a sound knowledge of geology, mine planning, mining economics, mining legislation, mine operating requirements, and mining equipment capabilities.
	www.thinkjobs.com /think.nsf/JONumAlpha/32942?Opendocument (355 words)

	Video stock footage — open pit coal mine.
		Operating open pit coal mine, including working coal shovel, giant dump trucks, and removal of overburden.
		A truck sprays water on a mine road and on the coal bed floor to suppress dust, and a very large dump truck is shown emptying a load of overburden (dirt).
		Comments On Clip Subjects: Coal mining and coal-fired electric power plants damage large areas of land, contribute disproportionately to global warming and air pollution, and release toxic mercury and other dangerous substances into the environment.
	www.ecofootage.com /vs0270.html (285 words)

	Basics of an open pit mine
		Open pit mines can be used in coal mining, and they are used extensively in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum, and many minerals.
		In a open pit coal mine, the pit bottom would be the bottom mined coal seam elevation, since it is usually feasible to extract multiple seams when surface mining coal.
		The planning of an open pit mine is, therefore, basically an exercise in economics, constrained by certain geologic and mining engineering aspects.
	www.mine-engineer.com /mining/open_pit.htm (516 words)

	Business Report - Xstrata: McArthur River mine to move to open pit
		The development of open pit mining within the existing mine lease will necessitate the rechannelling of a 5.5km section of the McArthur River and around 2.5km of Barney and Surprise Creek around the open pit, but entails no additional infrastructure construction.
		Subject to government approval, the open pit development would be completed over a period of two years, with underground operations scheduled to cease in the fourth quarter of 2005.
		The open cut development marks a considerable change from previous plans by the former MIM Holdings to expand the mine significantly, which entailed the construction of a zinc refinery and coal-fired power station on site and the damming of the Glyde River.
	www.businessreport.co.za /index.php?fSectionId=&fArticleId=2815607 (1128 words)

	OPEN PIT URANIUM MINING
		The photograph shows the overburden pile and haulage roads typical of an open pit uranium mine.
		This aerial photograph of the Sweetwater Pit was taken on September 25, 1980.
		The overburden pile is shown in the center of the photograph.
	www.wma-minelife.com /uranium/mining/openpit.html (49 words)

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