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Juneau Mining District
The Juneau mining district is a gold mining area in the U.S. state of Alaska. In 1880 a local inhabitant, Chief Kowee, revealed to prospectors Joe Juneau and Richard Harris the presence of gold in what is now named Gold Creek in Silver Bow Basin. The city of Juneau was founded there that year. The strike sparked the Juneau gold rush which resulted in the development of many placer and lode mines. The largest early mines were the Treadwell complex and the AJ lode mine. The steep, wet, timber-covered, seaside mountain setting provided water power, transportation, and lumber such that, "extraordinarily low costs of operation make available low grade ore that under conditions only slightly different would be valueless." The first claims of what was to become the Treadwell complex were staked in 1881. Mining the Treadwell site began by sluicing residual placers over the lode deposits. Underground mining began with a five-stamp mill operating in 1883. In the mid-1910s, with 960 stam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clean Water Protection Act
The Clean Water Protection Act () was a bill introduced in the 111th United States Congress via the House of Representatives Subcommittee on Water Resources and Environment, of the Committee on Transportation and Infrastructure. It proposed to redefine "fill material" to not include mining "waste" under the Federal Water Pollution Control Act. It was introduced by Frank Pallone and Chris Shays in the 110th Congress, and almost identical bills had been introduced in previous years. As of July 2009, H.R.1310 had 154 co-sponsors. Environmental groups such as Appalachian Voices, Kentuckians for the Commonwealth and Sierra Club supported the legislation because of their stance against mountaintop removal mining. It would also have affected situations similar to the Kensington Mine operation near Juneau, Alaska where a mine was permitted to discharge mining waste into a small lake as "fill."U.S. Supreme Court''Coeur Alaska, Inc v. Southeast Alaska Conservation Council, et al.''557 U.S. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alaska Mining District
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Central Alaskan Yup'ik language, Yup'ik: ''Alaskaq''; tli, Anáaski) is a U.S. state, state located in the Western United States on the northwest extremity of North America. A enclave and exclave, semi-exclave of the U.S., it borders the Provinces and territories of Canada, Canadian province of British Columbia and the Yukon territory to the east; it also shares a Maritime boundary, maritime border with the Russian Federation's Chukotka Autonomous Okrug to the west, just across the Bering Strait. To the north are the Chukchi Sea, Chukchi and Beaufort Sea, Beaufort Seas of the Arctic Ocean, while the Pacific Ocean lies to the south and southwest. Alaska is by far the list of U.S. states and territories by area, largest U.S. state by area, comprising more total area than the next three largest states (Texas, California, and Montana) combined. It represents the list of country subdivisions by are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juneau
The City and Borough of Juneau, more commonly known simply as Juneau ( ; tli, Dzánti K'ihéeni ), is the capital city of the state of Alaska. Located in the Gastineau Channel and the Alaskan panhandle, it is a unified municipality and the second- largest city in the United States by area. Juneau was named the capital of Alaska in 1906, when the government of what was then the District of Alaska was moved from Sitka as dictated by the U.S. Congress in 1900. The municipality unified on July 1, 1970, when the city of Juneau merged with the city of Douglas and the surrounding Greater Juneau Borough to form the current municipality, which is larger by area than both Rhode Island and Delaware. Downtown Juneau () is nestled at the base of Mount Juneau and across the channel from Douglas Island. As of the 2020 census, the City and Borough had a population of 32,255, making it the third-most populous city in Alaska after Anchorage and Fairbanks. Juneau experiences a daily influx o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clean Air Act (United States)
The Clean Air Act (CAA) is the United States' primary federal air quality law, intended to reduce and control air pollution nationwide. Initially enacted in 1963 and amended many times since, it is one of the United States' first and most influential modern environmental laws. As with many other major U.S. federal environmental statutes, the Clean Air Act is administered by the U.S. Environmental Protection Agency (EPA), in coordination with state, local, and tribal governments. EPA develops extensive administrative regulations to carry out the law's mandates. The associated regulatory programs are often technical and complex. Among the most important, the National Ambient Air Quality Standards program sets standards for concentrations of certain pollutants in outdoor air; the National Emissions Standards for Hazardous Air Pollutants program sets standards for emissions of particular hazardous pollutants from specific sources. Other programs create requirements for vehicle f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Industrial Wastewater Treatment
Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment. Some industrial facilities generate wastewater that can be treated in sewage treatment plants. Most industrial processes, such as petroleum refineries, chemical and petrochemical plants have their own specialized facilities to treat their wastewaters so that the pollutant concentrations in the treated wastewater comply with the regulations regarding disposal of wastewaters into sewers or into rivers, lakes or oceans. This applies to industries that generate wastewater with high concentrations of organic matter (e.g. oil and grease), toxic pollutants (e.g. heavy metals, volatile organic compounds) or nutrients such as ammonia. Some industries install a pre-treatment system to remove som ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Froth Flotation
Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in mineral processing, paper recycling and waste-water treatment industries. Historically this was first used in the mining industry, where it was one of the great enabling technologies of the 20th century. It has been described as "the single most important operation used for the recovery and upgrading of Sulfide#Geology, sulfide ores". The development of froth flotation has improved the recovery of valuable minerals, such as copper- and lead-bearing minerals. Along with mechanized mining, it has allowed the economic recovery of valuable metals from much lower grade ore than previously. Industries Froth flotation is applied to a wide range of separations. An estimated 1B tons of materials are processed in this manner annually. Mineral processing Froth flotation is a process for separating minerals from gangue by exploiting differences in their hydrophobicity. Hydrophob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tongass National Forest
The Tongass National Forest () in Southeast Alaska is the largest U.S. National Forest at . Most of its area is temperate rain forest and is remote enough to be home to many species of endangered and rare flora and fauna. The Tongass, which is managed by the United States Forest Service, encompasses islands of the Alexander Archipelago, fjords and glaciers, and peaks of the Coast Mountains. An international border with Canada (British Columbia) runs along the crest of the Boundary Ranges of the Coast Mountains. The forest is administered from Forest Service offices in Ketchikan. There are local ranger district offices located in Craig, Hoonah, Juneau, Ketchikan, Petersburg, Sitka, Thorne Bay, Wrangell, and Yakutat. History The Alexander Archipelago Forest Reserve was established by Theodore Roosevelt in a presidential proclamation of 20 August 1902. Another presidential proclamation made by Roosevelt, on 10 September 1907, created the Tongass National Forest. On 1 July ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California
California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territories of the United States by population, most populous U.S. state and the List of U.S. states and territories by area, 3rd largest by area. It is also the most populated Administrative division, subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous Statistical area (United States), urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento, California, Sacramento is the state's capital, while Los Angeles is the List of largest California cities by population, most populous city in the state and the List of United States cities by population, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastineau Channel
Gastineau Channel (Lingít: ''Séet Ká'') is a channel between the mainland of the U.S. state of Alaska and Douglas Island in the Alexander Archipelago of southeastern Alaska. It separates Juneau on the mainland side from Douglas (now part of Juneau), on Douglas Island. The first European to sight the channel was Joseph Whidbey early in August 1794, first from the south and later from the west. It was probably named for John Gastineau, an English civil engineer and surveyor. Characteristics The channel is navigable by large ships, only from the southeast, as far as the Douglas Bridge, approximately . Between the bridge and Juneau International Airport, approximately , it is navigable only by smaller craft and only at high tide. The channel is becoming increasingly unnavigable due to shallow water depths. The two principal causes for this are: # Isostatic rebound Post-glacial rebound (also called isostatic rebound or crustal rebound) is the rise of land masses after the r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Douglas Island
Douglas Island is a tidal island in the U.S. state of Alaska. It is part of the city and borough of Juneau, just west of downtown Juneau and east of Admiralty Island. It is separated from mainland Juneau by the Gastineau Channel, and contains the communities of Douglas and West Juneau. History Douglas Island was named for John Douglas, Bishop of Salisbury, by Captain George Vancouver. Joseph Whidbey, master of during Vancouver's expedition, was the first to sight it in 1794. In 1886, people began to travel to Douglas Island to settle near the developing Treadwell gold mine. By 1902, the Douglas Island community had grown to a population of over 2800 residents, as businesses, schools, and homes began to develop alongside the expansion of the nearby gold mine. After the Gastineau Channel flooded the Treadwell mining tunnels in 1917, many residents were forced to move after the town's dramatic economic downturn, causing the Douglas population to decrease steadily until the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Canadian
French Canadians (referred to as Canadiens mainly before the twentieth century; french: Canadiens français, ; feminine form: , ), or Franco-Canadians (french: Franco-Canadiens), refers to either an ethnic group who trace their ancestry to French colonists who settled in Canada beginning in the 17th century or to French-speaking or Francophone Canadians of any ethnic origin. During the 17th century, French settlers originating mainly from the west and north of France settled Canada. It is from them that the French Canadian ethnicity was born. During the 17th to 18th centuries, French Canadians expanded across North America and colonized various regions, cities, and towns. As a result people of French Canadian descent can be found across North America. Between 1840 and 1930, many French Canadians immigrated to New England, an event known as the Grande Hémorragie. Etymology French Canadians get their name from ''Canada'', the most developed and densely populated region of Ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Troy Ounce
Troy weight is a system of units of mass that originated in 15th-century England, and is primarily used in the precious metals industry. The troy weight units are the grain, the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces). The troy grain is equal to the grain unit of the avoirdupois system, but the troy ounce is heavier than the avoirdupois ounce, and the troy pound is lighter than the avoirdupois pound. One troy ounce (oz t) equals exactly 31.1034768 grams. Etymology Troy weight probably takes its name from the French market town of Troyes where English merchants traded at least as early as the early 9th century. The name ''troy'' is first attested in 1390, describing the weight of a platter, in an account of the travels in Europe of the Earl of Derby. Charles Moore Watson (1844–1916) proposes an alternative etymology: ''The Assize of Weights and Measures'' (also known as ), one of the statutes of uncertain date from the re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
