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The town of Butte, Montana (pronounced “byoot”) is known as the “Richest Hill on Earth” and "The Mining City". The Butte Mining District has produced gold, silver, copper, molybdenum, manganese, and other metals.
The area's bedrock consists of the Butte Quartz Monzonite (a.k.a. Butte Pluton), which is part of the Boulder Batholith. The Butte Quartz Monzonite ("BQM") formed 76.3 million years ago, during the mid-Campanian Stage in the Late Cretaceous. BQM rocks have been intruded and altered by hydrothermal veins containing valuable metallic minerals - principally sulfides. The copper mineralization has been dated to 62-66 million years ago, during the latest Maastrichtian Stage (latest Cretaceous) and Danian Stage (Early Paleocene). In the supergene enrichment zone of the area, the original sulfide mineralogy has been altered.
Seen here is the Continental Mine, also known as the Continental Pit. It is the only active mine in modern Butte. Mining here was started in 1980 by the Anaconda Copper Mining Company - it is currently owned by Montana Resources. The mine is situated on the eastern side of the Continental Fault, a major Basin & Range normal fault in the Butte area with about 3500 feet of offset. Over 100 different copper minerals are known from Butte to the west of the fault - many are minor minerals. East of the fault, lower grade rocks are present. The Continental Mine targets this low-grade deposit, which consists of disseminated copper sulfides plus copper- and molybdenum-bearing hydrothermal veins that intrude the BQM. Minerals include chalcopyrite, molybdenite, malachite, azurite, and cuprite. A secondary biotite mica halo is present around the deposit - the biotite is derived from hornblende amphibole.
Copper and molybdenum concentrates are produced at the Continental Mine, but they are not smelted locally and not even smelted in America. Concentrates are sold around the world, where material is smelted and the metals are produced. America shipping rocks overseas and buying back the finished product is the behavior of an underdeveloped country - America is not interested in smelting anymore - a sad reality.
When I visited in 2010, the Continental Mine was making 50,000 to 52,000 tons of ore each day. This mine can operate down to an ore grade of 0.1% copper. Most of the mineralization is disseminated copper, but veins are also present. Two stages of mineralization occurred in the Butte area - a porphyry copper system and a main stage system with large veins. The bottom of the porphyry copper system is ~ less than 12,800 feet below the surface. Veins peter out at 5600 to 5800 feet below the surface. At the Continental Mine, veins are small - they're veinlets less than 6 inches wide.
Mining is done 24 hours a day, 365 to 366 days per year. There's 1 to 2 days of down time at the mill. During those days, mining stops and waste material is moved. The ore:waste ratio is 8:10 (= strip ratio). The alluvial overburden consists of 7 paleosol horizons, including some caliches - the lime content results in an average pH of 8. The caliche material can be used to treat acidic materials.
"An ore deposit is a mine if it can stand total mismanagement and still make money."
This dedicated mining dial read directly to 5 min. of arc - shown mounted on gun-metal tripod.
Lighter and more compact than the Hilger & Watts dial.
Much used underground during 1950's.
Facebook uses data mining by collecting your information to customize the advertisements that pop up on the side of your Facebook page. It is geared to give you a more personalized advertising experience but some argue that it interferes with their privacy.
Photo taken by Vera Chapman (1923-2015), a geographer and local historian who wrote more than 20 local history books on Darlington and the surrounding area.
Image from the Darlington Local Studies picture collection. If you would like a copy of this image please contact local.studies@darlington.gov.uk quoting picture reference 'E820048025', or if you would like to see other images of the Darlington area please visit the Centre for Local Studies, at Darlington Library.
I built this quite sometime ago, it was shortly after the first Power Miners sets were released whenever that was.
Anyway those sets inspired me to make this. I have never really built a wheeled vehicle before and I think its decent for a first try, though I will admit the blade on the front looks tacked on.
And a little tid bit you might like to know is the upper chassis is seperate from the axle/wheel assembly.
If you've never been in a mine, this picture should explain why behemoth and metal giant are terms that are entirely appropriate for mining trucks.
Post Office at Leadfield. The site became a boomtown mining camp in 1925, but the whole enterprise was a stock fraud. A small low-grade lead deposit had been salted with richer ore, then slickly marketed to investors. By 1927, the promoters abscounded with the money and the town was quickly abandoned. Only a few buildings remain. Titus Canyon. Death Valley National Park. Inyo Co., Calif.
The Colliery Winding Engine at Beamish Museum in Steam. The sights, sounds, and smells of our mining past demonstrated by one of the museum's dedicated volunteers.
Mining museum assembled by former miners themselves back in 2004.
Manifesta 9, the only itinerant european biennial of contemporary art, takes place between June 2 and September 30, 2012 at the Waterschei mine in Genk, Limburg, Belgium.
Photo: Latitudes | www.lttds.org
Zollverein colliery headstock over shaft No.12 is still used for drainage of the central Ruhr area although mining here ended in 1986. It forms an important landmark and is part of the Museum of the Ruhr and a World Heritage Site.
This coal loading station is used for the transport of lignite from the Kolubara Mine, funded by the EBRD...
The Kolubara mining complex is funded by public financial institutions - the European Bank for Reconstruction and Development (EBRD) and the German development bank KfW - despite the fact that the Serbian energy system already heavily depends on coal (69%).
Abandoned mining operation - west of Eureka, Nevada. I asked around town about this mine, and looked online, but came up empty-handed on information. The white on the ground is snow.
A view up from 551 meters below the surface of the earth inside exploration shaft #1 at the Oyu Tolgoi copper-gold project run by Ivanhoe Mines Ltd in Khanbogd soum, Mongolia October 21, 2006.
Copyright: Luke Distelhorst
Mines loading bay
from truck to straight to barges
more pics and videos
joegoauk-pointofview.blogspot.in/2012/10/mining-operation...
There's gold in them there hills. Banska Stiavnica was first mined before the turn of the first Millennium (969 AD) and from the 1100s was a major center of mining in the region - at one point it was one of the wealthiest towns in the Hapsburg empire - but that was some time ago
Photographed at the Battery Hill Mine Museum. Tennant Creek has a rich history as a gold mining centre. Here was found one of the richest gold bearing seams ever mined in the world. Very remotely located in central Australian desert country, life was harsh for the people who lived here.
Again with this one, the quality and focus and zoom and aperture and so forth might not be the greatest, but that just gives it more of that old feeling you would have got with pictures when mining was strife.
Protest rally called by Mining Dependents at Kranti Circle, KTC Panaji on 19.3.18. Supreme Court stopped all mining activities effective 16.3.18 after cancelling all mining permits. Protestors blocked traffic from both bridges and other entry points to the city. As a last resort, protestors were Lathi charged around 3pm. Collector Nila Mohanan, police force etc Video youtu.be/CzaV1Hyr8Us
Despite the mining industry facing a tough economic climate and regular strike action over the past year, the Department of Mineral Resources has approved 36 new mining licences in the past year. These projects have the potential to create about 6 000 much-needed jobs in the sector, particularly ahead of more job cuts by some of the biggest miners in South Africa.
Falling metal prices and increasing labour costs are just two of the reasons that companies like Lonmin and Harmony will be reducing their workforces. Lonmin announced a planned cut of 10 percent of its labour force, amounting to 3 500 employees, while Harmony has cut more than 5 000 jobs since 2012. Similarly, Last week BHP Billiton announced that it will be simplifying its portfolio by demerging a group of high quality assets to create South32, necessitating a labour reduction.
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