Mining threatens Minnesota's pristine Boundary Waters

Jan 20, 2018· Mining threatens Minnesota's pristine Boundary Waters ... sulfur-ore mining, which is known to be the most toxic mining industry in the United States. The sulfide-ore mining process used to ...

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Sulfide Mining Overview - Save Our Sky Blue Waters

the economic feasibility of mining ores with even lower concentrations is likely to increase. For example, the proposed Polymet operation has an concentration of 0.28% copper and 0.08% nickel. 11 Sulfide Mining Process The sulfide mining process consists of: exploration, site preparation, mining,

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Sulphide Ores - Corporate

Sulphide Ores Optimize your recovery and reagent consumption for sulfide ores with customized technical solutions. At Clariant Mining Solutions, we are proactive solution-seekers committed to optimizing your mineral processing operations through creative problem-solving.

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Not all sulfide mines will result in the severity of harm experienced at Torch Lake. Moreover, some of sulfide mining's ecological threats can be mitigated or avoided alto- gether. Nevertheless, the decision to allow sulfide mining inevitably is a decision to permit some ecological harm.

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Copper Mining and Extraction: Sulfide Ores

Mining Metals. Metals are often found as compounds in ores. An ore is a rock or mineral that has enough metal in it to make it worth extracting. Mining copper About 200 years ago the UK was an important world source of copper and tin and there were mines in Cornwall and Devon.

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Tecflote™ - Novel Chemistry for New Sulfide Collectors

Surface Chemistry | Mining 7 Tecflote: designed for flotation of sulfide ores Unique features vs. traditional thiol collectors: Completely different particle / bubble attachment mechanism Significantly better performance (selectivity and recovery) for Au and …

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SULFIDE MINING - Minnesota Center for Environmental ...

Sulfide mining, unfortunately, poses several significant environmental risks. The most significant one is the threat to water quality. When sulfide ores are exposed to air and water, the result is sulfuric acid, which causes the leaching of potentially toxic heavy metals and the release of sulfates that contribute to the methylation of mercury.

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Interior Makes 'Abominable Decision' to Renew Expired ...

7 days ago· This abominable decision to reissue expired permits for sulfide-ore copper mining in a place so pristine you cannot use a motorized boat shows the depths of the Department of the Interior’s imbalance towards mining at all costs, conservation of …

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Sulfide Ore Processing « TCB Metals and Refining

Sulfide Ore Processing. Home → Sulfide Ore Processing . Processing Sulfide Ores. Historically, miners have shipped their sulfide concentrates to overseas smelters that have little to no regulations or emissions controls. However, with the implementation of the Mercury Export Ban of 2008 and the high costs of installing equipment to prepare ...

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The Threat | Save the Boundary Waters

Sulfide-ore copper mining is much more toxic than Minnesota’s taconite mining. It produces giant waste piles that, when exposed to air and water, leach sulfuric acid, heavy metals and sulfates. Sulfide-ore copper mines pollute groundwater, rivers and lakes. In the history of sulfide mining…

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Sulfide Mining – Minnesota Trout Unlimited

• Noise, dust and light pollution from 24-hour-a-day, 365-day-a-year mining operations would affect animal behavior and the quiet fishing experience. • Mine infrastructure and additional road traffic would lead to forest fragmentation, which disrupts wildlife travel corridors and accelerates the spread of weedy invasive species, which ...

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Ivanka Trump’s Landlord May Be ‘Trying to Buy Her Silence ...

Politicians who support sulfide mining near our waterways should be voted OUT!” ... Copper is found in rocks bearing sulfur, unlike traditional iron ore mining. Water runoff from pulverized ...

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Recovery of Gold in Pyritic Sulfide Ores - Mine Engineer.Com

Recovery of gold in sulfide ores has fallen into several categories. First is froth flotation, and second is cyanidation of the ores. Using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best I have heard of is around 50% recovery.

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Acid mine drainage - Wikipedia

Acid mine drainage, acid and metalliferous drainage (AMD), or acid rock drainage (ARD) is the outflow of acidic water from metal mines or coal mines.. Acid rock drainage occurs naturally within some environments as part of the rock weathering process but is exacerbated by large-scale earth disturbances characteristic of mining and other large construction activities, usually within rocks ...

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The great sulfide mining divide: You can’t save the BWCA ...

The U.S. Forest Service needs to nix the Twin Metals leases, and the PolyMet land exchange as well. The time for integrity is now.

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Sulfide Mining | Sierra Club

The mining of copper/nickel sulfide ores is a toxic type of mining that is risky to our environment, our workers and communities, and local economies. Mining sulfide rock releases acid and toxic metals and contaminants that pollute rivers and groundwater for hundreds of years, long after the profits are spent and the products buried in landfills.

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BoundaryWatersAction

Prepared and paid for by the Boundary Waters Action Fund. The Boundary Waters Action Fund is a 501(c)4 dedicated to protecting the Boundary Waters Wilderness from the threat of sulfide-ore copper mining in the watershed of the Boundary Waters.

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Sulfide Ore | Article about Sulfide Ore by The Free Dictionary

Sulfide Ore any of several natural mineral formations consisting of metal sulfides. Metal selenides, tellurides, arsenides, and antimonides are also classified among the sulfide ores. Sulfide ores are an important source for the production of Ni, Co, Cu, Zn, Pb, Mo, Bi, Sb, and Hg. They contain not only sulfides but also other minerals, including ...

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What is Sulfide Mining? | Mining Action Group

Metallic sulfide mining (aka hard rock mining) is the practice of extracting metals such as nickel, gold and copper from a sulfide-rich ore body. Sulfides are a geologic byproduct of mining in this area, and by exposing sulfides to the air and water in our atmosphere, sulfuric acid can be created — threatening to poison the nearby water ...

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Nickel processing | Britannica.com

With nickel found in two radically different types of ore, it is not surprising that the mining methods differ. Sulfide deposits are usually mined by underground techniques in a manner similar to copper, although some deposits have been mined using open pits in the early stages.

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Sulfide Mining Near BWCA – Ely Minnesota

The process of mining copper and nickel are so different from the process of mining iron ore that we, as residents of this area, and anyone who values the BWCA and their experiences here, must look carefully at the downside of sulfide mining and the likelihood of “acid mine drainage” into the BWCA.

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The Threat of Sulfide Mining — Friends of the Boundary ...

Sulfide mining, the process of extracting copper, nickel and other metals from sulfide ores, has been deemed the most toxic industry in the country by the EPA. When the sulfide ore comes in contact with oxygen or water, it creates sulfuric acid.

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The Uncertain Future of the Boundary Waters | Outside Online

May 20, 2019· While sulfide-ore mining techniques vary and continue to evolve, in the past some safety records have caused concern. A 2012 study by the nonprofit Earthworks reviewed 14 U.S. sulfide-ore copper ...

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Sulfide-Ore Copper Mining Boundary Waters ... - SCOUTER Forum

Jan 17, 2018· In every direction, interconnected waterways laced the forest, and when considering sulfide-ore mining, the issue of water is central. When exposed to air and water, sulfide ore in which copper and other minerals occur creates sulfuric acid and generates heavy metals and other pollutants. This is sometimes called "acid mine drainage."

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Copper extraction - Wikipedia

The copper ore is crushed and ground to a size such that an acceptably high degree of liberation has occurred between the copper sulfide ore minerals and the gangue minerals. The ore is then wet, suspended in a slurry, and mixed with xanthates or other reagents, which render the sulfide …

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Sulfide OreS - clariant.com

Sulfide OreS Clariant Mining Clariant MininG 2645 Technology Forest Blvd. The Woodlands, Texas 77381 Tel: +1 281-465-9100 Fax: +1 281-465-9200 p>

Sulfide Mining, Mining Methods, Techniques, Copper, Zinc ...

Mining is the method of tacking materials from the earth to get valuable metal ores like copper, zinc, and lead, which are known as target minerals in mining terms. Metal ores like copper, zinc and lead are minute quantities contrasted to the whole composition of the earth.

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Sulfide Mining in Northeastern Minnesota - Northeastern ...

Dec 06, 2013· The Economics of Sulfide Mining. The State of Minnesota is relying on a fatally flawed economic impact analysis to support sulfide ore mining in Northeastern Minnesota. Dr. Evan Hjerpe and Dr. Spencer Phillips found that the UMD study being used to project the Economic benefits of sulfide ore mining is of low quality and limited scope in scope.

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VMS Volcanogenic Massive Sulphide Ore Deposits ...

If we start with VMS Volcanogenic Massive Sulphide Ore Deposits and their Mineralization we see from this image shows some of the sulphide chimneys associated with the model black smoker VMS deposit. VMS will emit black plume of hot water venting from one of the chimneys. You’ll remember this cross section from reads on both porphyry deposits and epithermal, in the case of VMS deposit, we ...

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Copper Mining and Processing: Processing of Copper Ores ...

Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different ...

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- Northeastern Minnesotans for Wilderness

On March 7, Governor Mark Dayton released a letter he sent to Twin Metals Minnesota, owned by international mining company Antofagasta, about the need to protect the Boundary Waters. The letter outlines his “grave concerns” about Twin Metals’ proposed massive sulfide-ore mining operation in the Boundary Waters Wilderness watershed.

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Concerns Over Sulfide Mining Resurface With Tiffany's Bill ...

Sep 20, 2017· "The mining industry has consistently said for the past 20 years that they can do mining safely in a sulfide ore body and all the moratorium is saying is, 'OK, fine, show us.' So, we’re not imposing something on the mining industry that they haven’t already suggested is possible and doable."

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Sulfide mining record - WaterLegacy

There is ample reason to be skeptical about mining companies' and promoting agencies' promises that sulfide mining can be done without polluting the water. One can merely search the internet for "Acid Mine Drainage", and find numerous examples all over the …

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Sulphide Gold Ore Treatment by Leaching and Flotation Process

Problem with gold recovery from sulphide ore: How may a mill get the maximum recovery of gold from a sulphide ore, at the least capital cost and at the same time obtain the highest net return. This latter point is most important. In many cases a gold mill using an all-cyanide flowsheet with fine grinding of all the ore will report very low gold content in the tailings particularly on an ...

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