Note: For the most up to date information on the Sierra Club's efforts to stop sulfide mining, please see our Stop Sulfide Mining page, and blog.. Since the founding of the North Star Chapter in 1968, Sierra Club volunteers have been actively involved in mining issues within Minnesota: protecting Duluth's drinking water from asbestos-like fibers in …

Today's visualization comes to us from Foran Mining Corp. and goes in depth to show how one type of mineral deposit, Volcanogenic Massive Sulphide or "VMS", forms and is the primary source ...

Mining commonly comes with some significant environmental costs because disposal of mine waste can lead to significant problems. And, abandoned mines also pose environmental problems. Runoff from waste piles or mine sites may create soil, groundwater, or surface water contamination. Many ore bodies, for example, are rich in …

For some low-grade nickel sulfide ore from lean ore regions, for example, a sulfide mine in Shaanxi, China, due to the grade of nickel sulfide raw ore generally between 0.3 and 3.0%, it is necessary to enrich the ore by mineral processing before smelting. Sulfide ores are crushed and ground in order to liberate nickel minerals by …

Even new sulfide mining and processing technology and practices like lime neutralization, cementation, double lined (ponds, tailings basins, and waste dumps), and topographic isolation of tailings ...

This form of pollution may arise from mine wastes (acid mine drainage) or sulfide-containing natural rocks (acid rock drainage). ... Table 2 shows the main types of ore deposits that contain significant amounts of sulfide minerals, their major ore minerals, the metals extracted from them, and some specific examples (see Cox and Singer 1987; ...

The sulfide-ore copper mining industry has a disastrous track record. A peer-reviewed report prepared by Earthworks studied fourteen sulfide-ore copper mines representing 89% of current U.S. …

Most of us realize that mining sulfide ores to source copper threatens clean water and public health. Across the United States, every sulfide mine in a water-rich …

Sulfide mineralization is common to ore deposits mined by the metals, minerals, and energy sectors. As a result, sulfide-mineral oxidation within mining …

In Fe-poor ore deposits, for example, sulfide assemblages will include covellite, digenite, or chalcocite, but not pyrite or pyrrhotite. Diagrams such as the one in this box (Figure 9.46) are useful ways to describe complex mineral relationships without words, and we use them to predict and interpret ore deposit mineralogy.

sulfide-ore copper nickel (sulfide-ore) hardrock mining in Minnesota. Although the debate is not a new one, the landscape surrounding decisions regarding this type of mining within Minnesota's borders is dynamic and constantly changing. As 2021 was ushered in, so were new legisla-tive and legal efforts affecting sulfide-ore mining.

Commonly used bacteria for sulfide ore oxidation are Acidithiobacillus thiooxidans, A. ferrooxidans, and Leptospirillum ferrooxidans ... In order to increase the zinc content in mining ore from about 10% to the range of 40–60%, upstream processes for ore beneficiation are necessary. This typically includes size reduction processes in ...

Sulfide-ore mining for copper and nickel, however, has never been attempted here. In the case of PolyMet, MCEA has led the fight for accountability and true science-based decision-making. MCEA lawyers and experts have time and again cast light on the flaws inherent in the PolyMet proposal, first in the environmental review and permitting ...

Unlike iron mining, sulfide-ore copper mining has never been done in the state of Minnesota. This type of mining generates waste rock full of sulfates, which, when exposed to air and water, becomes sulphuric acid, and leaches toxins like heavy metals into the surrounding water. This destructive industry should not be allowed in the headwaters ...

Copper sulfide mines can cause severe impacts to drinking water aquifers, contamination of farmland, contamination and loss of fish and wildlife and their habitat, and risks to public health. Families on the front lines of …

T he copper mining industry is reaching a turning point. Surface oxide deposits are depleting and copper miners are turning their attention to untapped sulfide ores found deeper underground. ... The …

Prior to mining, all rocks contained in a mineral deposit must be placed in one of several categories known as ore types. Each ore type describes a different way that the rock will behave in processing. The ore type determines which process stream a particular mined unit will be sent to, sets expectations for process engineers and …

A new report, "The Minnesota Prove It First Bill and the Myth of Sulfide Ore Mining without Environmental Contamination" by mining engineer Steve Emerman, supports what River Alliance of Wisconsin …

Nickel is commonly present in two principal ore types—sulfide or laterite. Sulfide ores are typically derived from volcanic or hydrothermal processes and usually include copper (Cu) and/or cobalt (Co), and often precious metals such as gold (Au) or platinum (Pt), palladium (Pd) and rhodium (Rh) (the platinum group metals or PGMs) …

Complex sulphide ores represent considerable reserves and resources in base non ferrous metals, in precious metals, and in sulphur. Some of their essential characteristics, which allow a general presentation of the complexity of their processing options, from the ore to the pure metals or finished products, have already been presented by the author (1,2).

• Sulfide-ore copper mining has the potential to release numerous chemicals known to negatively affect human health, including mercury, arsenic, lead, asbestos-like fibers, and air pollution. • These chemicals are included in the World Health Organization's "top 10 chemicals of major public

Copper Sulfide Mining. A peer-reviewed study of the track record of water quality impacts from copper sulfide mines found severe impacts to drinking water aquifers, contamination of farmland, contamination and loss of fish …

Congresswoman Betty McCollum (DFL-Minn.) released the following statement today after reintroducing the Boundary Waters Wilderness Protection and Pollution Prevention Act, legislation to permanently protect the Boundary Waters watershed from toxic sulfide-ore mining pollution: "Last week's historic action by Secretary Deb …

Copper sulfide ores are typically the most profitable copper ore type to mine. That is because they have high copper content, and the copper in them can more easily be separated from unwanted ...

Sulfide mining is the process of extracting trace amounts of copper, nickel and other metals from sulfide-bearing ores. ... The fundamental danger of copper-nickel mining around the BWCA has to do with the fact that the ore contains a minute amount of copper and nickel. It's not 50% copper, or 25% copper, not 10% copper or even 5% copper. ...

Sulfide-ore copper mining has the potential to release numerous chemicals known to negatively affect human health, including mercury, arsenic, lead, asbestos-like fibers, and air pollution. These chemicals …

Nickel ore refers to the naturally occurring rocks or minerals that contain significant amounts of nickel. Nickel is a chemical element with the symbol Ni and atomic number 28. It is a silvery-white metal with a relatively high melting point and excellent corrosion resistance. Nickel is commonly found in the Earth's crust, but it is typically …

What is sulfide mining? "Sulfide mining" refers to mining metals that are foun. in sulfide-bearing rock. Mining metals in sulfide ores can be done in two ways: in underground …

mercury, methylmercury, a known neurodevelopmental toxin. SOCN mining differs sig-nificantly from iron-ore (taconite or ferrous) mining which has been practiced for deca-des within this region (Onello et al. 2016). Given the geology and chemistry of sulfide-ore containing rock, once this ore is extracted and comes in contact with moisture and

And smelting, which involves heating ore to high temperatures to extract metals from it. The bill would be "a crucial piece of legislation to protect the Boundary Waters by banning the riskiest practices associated with sulfide-ore copper mining," said Ingrid Lyons, executive director of Northeastern Minnesotans for Wilderness, in a …