Ore is natural rock or sediment that contains one or more valuable minerals concentrated above background levels, typically containing metals, that can be mined, treated and sold at a profit. The grade of ore refers to the concentration of the desired material it contains. The value of the metals or minerals a rock contains must be weighed against the cost of extraction to determine whether it is of sufficiently high grade to be worth mining and is therefore considered an ore. A complex ore is one containing more than one valuable mineral.
The Upper Peninsulaof Michigan—also known as Upper Michigan or colloquially the U.P.—is the northern and more elevated of the two major landmasses that make up the U.S. state of Michigan; it is separated from the Lower Peninsula by the Straits of Mackinac. It is bounded primarily by Lake Superior to the north, separated from the Canadian province of Ontario at the east end by the St. Marys River, and flanked by Lake Huron and Lake Michigan along much of its south. Although the peninsula extends as a geographic feature into the state of Wisconsin, the state boundary follows the Montreal and Menominee rivers and a line connecting them.
Ontonagon County is a county in the Upper Peninsula of the U.S. state of Michigan. As of the 2020 census, the population was 5,816, making it Michigan's third-least populous county. The county seat is Ontonagon. The county was set off in 1843, and organized in 1848. Its territory had been organized as part of Chippewa and Mackinac counties. With increasing population in the area, more counties were organized. After Ontonagon was organized, it was split to create Gogebic County. It is also the westernmost county in United States that lies within the Eastern Time Zone.
Keweenaw County is a county in the western Upper Peninsula of the U.S. state of Michigan. As of the 2020 census, the county's population was 2,046, making it Michigan's least populous county. It is also the state's largest county by total area, including the waters of Lake Superior, as well as the state's northernmost county. The county seat is Eagle River.
The Keweenaw Peninsula is the northernmost part of Michigan's Upper Peninsula. It projects into Lake Superior and was the site of the first copper boom in the United States, leading to its moniker of "Copper Country." Its major industries are now logging and tourism, as well as jobs related to Michigan Technological University.
The Copper Country is an area in the Upper Peninsula of Michigan in the United States, including Keweenaw County, Michigan, Houghton, Baraga and Ontonagon counties as well as part of Marquette County. The area is so named as copper mining was prevalent there from 1845 until the late 1960s, with one mine continuing through 1995. In its heyday in the latter half of the 19th century and the early 20th century, the area was the world's greatest producer of copper.
The Minesota Mine is a former copper mine near Rockland, Ontonagon County in the Upper Peninsula of the U.S. state of Michigan. The Minesota was one of the most productive and famous early mines in the Michigan Copper Country.
Keweenaw National Historical Park is a unit of the U.S. National Park Service. Established in 1992, the park celebrates the life and history of the Keweenaw Peninsula in the Upper Peninsula of the U.S. state of Michigan. It is a federal-local cooperative park made up of two primary units, the Calumet Unit and the Quincy Unit, and almost two dozen cooperating "Heritage Sites" located on federal, state, and privately owned land in and around the Keweenaw Peninsula. The National Park Service owns approximately 1,700 acres (690 ha) in the Calumet and Quincy Units. Units are located in Baraga, Houghton, Keweenaw, and Ontonagon counties.
This is a list of the National Register of Historic Places listings in Houghton County, Michigan.
Stamp sand is a coarse sand left over from the processing of ore in a stamp mill. In the United States, the most well-known deposits of stamp sand are in the Copper Country of northern Michigan, where it is black or dark gray, and may contain hazardous concentrations of trace metals.
A native metal is any metal that is found pure in its metallic form in nature. Metals that can be found as native deposits singly or in alloys include aluminium, antimony, arsenic, bismuth, cadmium, chromium, cobalt, indium, iron, manganese, molybdenum, nickel, niobium, rhenium, selenium, tantalum, tellurium, tin, titanium, tungsten, vanadium, and zinc, as well as the gold group and the platinum group. Among the alloys found in native state have been brass, bronze, pewter, German silver, osmiridium, electrum, white gold, silver-mercury amalgam, and gold-mercury amalgam.
In the United States, copper mining has been a major industry since the rise of the northern Michigan copper district in the 1840s. In 2017, the US produced 1.27 million metric tonnes of copper, worth $8 billion, making it the world's fourth largest copper producer, after Chile, China, and Peru. Copper was produced from 23 mines in the US. Top copper producing states in 2014 were Arizona, Utah, New Mexico, Nevada, and Montana. Minor production also came from Idaho, and Missouri. As of 2014, the US had 45 million tonnes of known remaining reserves of copper, the fifth largest known copper reserves in the world, after Chile, Australia, Peru, and Mexico.
The Ontonagon Boulder is a 3,708 pounds (1,682 kg) boulder of native copper originally found in the Upper Peninsula of Michigan, United States, and now in the possession of the Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution. In 1843 the boulder was purchased from a local entrepreneur and shipped to Washington D.C.
In Michigan, copper mining became an important industry in the 19th and early 20th centuries. Its rise marked the start of copper mining as a major industry in the United States.
The Nonesuch Shale is a Proterozoic geologic formation that outcrops in Michigan and Wisconsin, United States, but has been found by drill holes to extend in the subsurface as far southwest as Iowa.
The Calumet Historic District is a National Historic Landmark District that encompasses most of the village of Calumet, Michigan. The district was designated in 1989 for the community's importance in the history of the region's copper mining industry.
Coloradoite, also known as mercury telluride (HgTe), is a rare telluride ore associated with metallic deposit. Gold usually occurs within tellurides, such as coloradoite, as a high-finess native metal.
The Victoria Mine is the name given to a series of copper mines located in Rockland Township, Ontonagon County, in Michigan's Copper Country. It was near this location that a large piece of float copper, known as the Ontonagon Boulder, was found. The mine operated off and on from 1849 until its final closure in 1921. Most of the metal found there was low grade native copper from the Forest Lode. Quartz, epidote, calcite, prehnite, and pumpellyite are also found in the rock.
Mohawkite is a rare rock consisting of mixtures of arsenic, silver, nickel, skutterudite and copper, with the formula Cu3As up to Cu6As, and the most desirable material was usually found in white quartz matrix. It has a hardness of 3–3.5 and a metallic luster. It is named after the Mohawk Mine, where it was originally found. Colors range from brassy-yellow to metallic gray, and sometimes will have a blue or greenish surface tarnish. These colors come from its two main ingredients, the arsenic-rich copper minerals algodonite and domeykite. Its color may resemble pyrrhotite, but unlike pyrrhotite, mohawkite is not magnetic.
