Auriferous quartz reefs which occur through the gneiss were mined over a period from 1875 to about 1911.
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Auriferous quartz veins were subsequently found in surface exposures at the site of the current open pit. Mining commenced on the deposit in 1967, and production has been continuous ever since.
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Columbia, thirty Chinese coins in the auriferous sand, twenty- > five feet below the surface. They appeared to have been strung, but on > taking them up the miner let them drop apart.
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They were chemists working in mines and smelting facilities, where they were called on for their know-how in metallurgy. Frequently they doubled as goldsmiths and were required to separate auriferous silver from base metal.
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Rock type is not reported. Mount Santo Tomas is close to the auriferous volcanic placements near Baguio, and beside the fault line which occasioned the July 16, 1990 earthquake devastating much of Luzon, and especially Baguio.
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Tellurides are accountable for just about 20% of gold production and gold mineralization is hosted chiefly by Archean-aged dolerites and basalts that have been metamorphosed to the greenschist facies. This mineralization occurs in hundreds of auriferous and telluride-bearing lodes.
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The Middle Fork continued producing large amounts of placer gold into the 1880s, more than 20 years after most nearby streams had been exhausted. Prospectors exploring the side canyons of the Middle Fork soon discovered that the auriferous (gold- bearing) gravels originated from strata about above the river. These auriferous gravels are actually ancient river beds, which over millions of years were eroded away resulting in the placer gold deposits of the modern river. Hydraulic mining and hard-rock mining operations soon spread along the Middle Fork canyon; Georgetown, established in 1849 on the divide south of the river, became the hub of this mining district.
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This is an auriferous, silicified- decalcified siltstone/mudstone from the Comus Formation (Lower Ordovician). Ore grade is about 0.20 to 0.25 ounces of gold per ton of rock. The gold mineralization is very finely disseminated: "invisible gold". Carlin–type gold deposits are sediment-hosted disseminated gold deposits.
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The Sawyer decision is reported as Woodruff v. North Bloomfield Gravel Mining Co., 18 F. 753 (CCD Cal. 1884). Soon thereafter, it was estimated that 130,000,000 yards of auriferous gravel remained to be mined.Lindgren, Waldemar (1911) The Tertiary Gravels of the Sierra Nevada of California, p. 139.
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Most outcrops on Table Mountain reveal flow-top breccias, while some outcrops show distinctive columnar jointing. The lava flow which covered the ancient river bed trapped auriferous, or gold-bearing, gravels beneath it, some of which have been accessed by mining operations dating back to the 1850s.
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The auriferous pyrite-sulfide quartz veins are the most important mineral structures and most of the underground development work was performed on them, including the Beanland Vein. These quartz veins are on the southeastern margin of the Net Lake-Vermilion Lake Deformation Zone, which is known for a high frequency of gold occurrences.
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Here a draft of auriferous extraction of some veins was attempted. The path that connects us is as short as it is steep. It worked a couple of years between 1876 and 1877 with unsatisfactory economic results. We are fortunate enough to have a copy of the payroll of the workers at the time.
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While the auriferous gravel was being washed in pans by approximately 3,000 local workers in the early 20th century, there were expectations that reef mining would supersede the primitive methods of gold extraction. In 1905, several syndicates were formed in the Transvaal to acquire properties in Madagascar, with some Rand mining experts visiting the island that year.
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The Berners Bay region forms the northwestern extremity of the auriferous mineralization zone on the mainland of Southeast Alaska known as the Juneau gold belt. It has been proposed to exploit the Kensington gold mine above the bay, but this has been subject to protests. Gold is found in quartz veins associated with the diorite country rock.
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The genus Macginitiea was named after the prominent paleobotanist Harry Dunlap MacGinitie, who was the first person to suggest the close relationship of Macginitiea to the family Platanaceae. Though fossils of Macginitiea were originally classified under the genus Aralia,Lesquereux, L. (1878). Report on the fossil plants of the auriferous gravel deposits of the Sierra Nevada. Welch, Bigelow.
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The Homestake Mine pit in Lead, South Dakota Typical auriferous greenschist gold ore from the Homestake Mine. Two small masses of native gold (Au) are visible near the bottom right. The Homestake Mine was a deep underground gold mine located in Lead, South Dakota. Until it closed in 2002 it was the largest and deepest gold mine in North America.
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The area was considered part of the North Bloomfield mining district, which was located on auriferous gravel beds which ran down the San Juan Ridge, and often branched out. One rich branch ran from N. Columbia through Lake City and on towards Red Dog and You Bet.Thompson and West, p. 59. Hydraulic mining took off with the arrival of ditch water.
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The gold was very fine, and much waterworn. Some of the gravel has been re- concentrated by later streams in shallow deposits. The original gravels vary from 30 feet to 70 feet in thickness, and values are confined to the lower layers. Small auriferous quartz veins have been found in the granitic rock, but are too small to pay for mining.
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In past years, exploration efforts have been geared to the testing of narrow quartz veins and the possibility of broader auriferous pods enclosed in altered rock has been neglected. The altered zone in the vicinity of the Penn mines should have been considered as a target for widespread low-grade gold mineralization with potential credits in silver, copper, lead, and zinc.
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The Aniuri Mine in southeast Ivory Coast is an example of auriferous quartz veins in the Afema shear zone (a continuation of the Bibiani shear zone from Ghana). Babadougou and Toulepleu both have alluvial gold mines. Diamonds are also found in alluvial deposits, south of Korhoga at Tortiya as well as at Seguela. Kanangone, Seguela and Tortiya all have kimberlite dikes but none contain diamonds.
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It is native to central parts of New South Wales in the Kydra reefs district to the south west of Cooma mostly in the Deua National Park and Wadbilliga National Park growing in auriferous country. It is usually situated on rocky outcrops or gullies growing in stony sandy soils around granite, rhyolite, metasandstone, slate and quartzite as a part of dry sclerophyll forest and shrubland communities.
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The mineralized wall rock mostly, but not exclusively, consists of shale-argillite (slate). Locally, the greywacke and arenite are cut by quartz veins and are mineralized. The veins are characterized by quartz, sulphide (auriferous arsenopyrite) and native gold (visible gold flakes have historically been observed in several slate belts). Wall rocks generally contain more sulphides than the veins, in the form of arsenopyrite selvedges.
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On 8 August 1851 an auriferous deposit of gold was found 3 kilometres west of Buninyong, Victoria, near Ballarat. The gold was discovered in a gully in the Buninyong ranges, by a resident of Buninyong, Thomas Hiscock.Griffiths Peter M, "Three Times Blest A History of Buninyong 1837 – 1901", Ballarat Historical Society p. 13 Hiscock communicated the find, with its precise locality, to the editor of the Geelong Advertiser on 10 August.
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La Mana, unlike other towns, is a settlement town by people who came from different parts of the country. They all brought their customs and traditions with them. Its immense forests, its gigantic plantations of banana, orito, yucca, cocoa, tobacco and coffee, as well as its strategic geographic location and its auriferous wealth, confer special characteristics that favor its development and has a leading role in Ecuadorian economy.
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The mineralization at Shangalon in Myanmar is related with fine-grained diorite intrusion into the hosting batholith at 40Ma. # Epithermal: The epithermal Au- Cu mineralization along with auriferous quartz veins are hosted by Cretaceous granodiorite and diorite magmatic rocks. # Ultramafic: The ultramafic-hosted deposits are discovered along with ophiolite fragments within the Myanmar. The Tagaung-Myitkyina Belt (TMB) comprises ophiolitic mantle peridotite and is a source of nickel laterite.
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There is both industrial and artisanal mining operations at the Sadiola, Morila, and Yatéla mines. Since the 1990s, artisan mined gold has been obtained from alluvial deposits of Kéniéba, Syama, the Tabakoto, and the Kalana underground gold mine. These mines have contributed about 65 tonnes of auriferous minerals towards the economy of the country. The United States Geological Survey estimates that Mali has 200,000 tons of lithium resources.
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The mineralization at Beanland was discovered by Paul Hermiston and Robert McCauley in 1934. It is situated in a vertical dipping quartz vein network that is long and has a maximum width of . Two types of mineralization exist, one type being auriferous quartz-carbonate veins with combinations of pyrite, galena, sphalerite and chalcopyrite present. The other is a simpler quartz vein with a combination of chalcopyrite, arsenopyrite and pyrite mineralization.
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By running fast water streams on the soft rocks, they were able to extract large quantities of gold by hydraulic mining methods (Ruina montium). When the gold had been exhausted, they followed the auriferous seams underground by tunnels using fire-setting to break up the much harder gold-bearing rocks. Pliny the Elder gives a good account of the methods used in Hispania, presumably based on his own observations.
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The most important product of ancient Pahang was gold. Its auriferous mines were considered the best and the largest in the whole peninsula. It was from here that there came the gold which formed the subject of the ancient trade with Alexandria. The peninsula as a whole was known to the world as a source of the precious metal to the extent that it was proclaimed Chrysḗ Chersónēsos (the golden peninsula) by Ptolemy.
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The most important product of Pahang was gold. Its auriferous mines were considered the best and the largest in the whole peninsula. It was from here that there came the gold which formed the subject of the ancient trade with Alexandria. The peninsula as a whole was known to the world as a source of the precious metal to the extent that it was proclaimed Chrysḗ Chersónēsos (the golden peninsula) by Ptolemy.
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A simple one can be constructed using a wooden framework, a hopper, a recovery tray, bellows, lever, and cord. Before the advent of modern metal screening material, sorting of gravels into smaller particles might have been done by hand. Such elimination of larger rocks aids in separating gold from dry, auriferous sediments to be processed, consequently, any modern "puffer-belly" could be outfitted with a screen, or "grizzly" for sorting the dry gravels into two sizes.
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On the gentle slope of the northwest side there are perceptibly flatter places or benches, but only one of these is persistent. This bench is traceable along Pioneer Creek for over . Its northeast end is but little above the present level of the creek while its southwest end is about above the creek. Over this bench and covering much of the slope below is a deposit of auriferous gravel left by the creek as it moved to the southeast.
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In Niukluk River itself, gold was found at its head, though most abundant below the mouth of American Creek. Just below the mouth of Ophir Creek, a little gold has been rocked out on the bars. The broad gravel flood plain in this part of the basin is said to be auriferous. Below the mouth of Ophir Creek the river has cut a small rock canyon below an old valley floor, leaving broad benches on either side.
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This basalt has been subjected to biotite-carbonate alteration and auriferous silicification. Gold mineralization has been dated to 2.712-2.723 billion years (during collision-related emplacement of several nearby igneous intrusions - Uchian Phase of the Kenoran Orogeny), and at 2.63-2.66 or 2.699 billion years (during a regional thermal event or another igneous intrusive event).Red Lake gold mine On November 25, 2019, Newmont Goldcorp announced an agreement to sell the Red Lake complex to Evolution Mining Limited.
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Detail of a 114-pound boulder which has an estimated 316 troy ounces of native gold. Auriferous volcanic breccia from the Little Annie Mine, Summitville. On display at 350px The Summitville mine was a gold mining site in the United States, located in Rio Grande County, Colorado south of Del Norte. It is remembered for the environmental damage caused in the 1980s by the leakage of mining by-products into local waterways and then the Alamosa River.
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Banket, a South African mining term, applied to the beds of auriferous conglomerate, chiefly occurring in the Witwatersrand gold-fields. The name was given to these beds from their resemblance to a pastry, known in Dutch as banket, resembling almond hard-bake. The word is the same as banquet, and is derived ultimately from bank or bench, meaning table-feast, hence applied to any delicacy or to various kinds of confectionery, a use now obsolete in English.
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Map of the Gold Creek area showing the location of the Perseverance shaft (top right) A glacier, which formerly extended to the mouth of Gold Creek and built up the moraines, excavated the depression that forms the basin. Subsequently, it was occupied by a lake that was separated from the lower portions of the creek by a solid rock divide. Lurvey Creek forks into North Lurvey Creek and East Lurvey Creek above the basin. The basin's lake beds are auriferous.
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San Francisco de Yuruaní San Francisco de Yuruaní, an indigenous community in the "km 250" of the Troncal 10 is an important craft selling place, and offers refueling for tourists. The name in the native language of the community is Kumarakapay. The town offers various items of tourist tat, including bracelets and necklaces. Tourists can find there a large sample of mineral stones common in Bolivar state, as auriferous quartz, rose quartz, slate, iron, marble, bauxite, silicon, jet and ruffe, among others.
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The Durham Mine worked a rich auriferous reef down to the level between 1879 and 1899 and again from 1907. It produced over of gold. For a short time the Etheridge was one of the richest goldfields in Queensland and in 1885 was still the second highest producer behind Charters Towers. However, due to the isolation, which resulted in high transport costs and scarcity of labour, and with the continuing development of Ravenswood (1868) and the Hodgkinson (1876) in competition, production began to lag behind other fields.
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From the 15th century to the 19th century, the Akan people dominated gold mining and trading in the region; throughout this period they were among the most powerful groups in Africa.The African heritage, Volume 3 Zimbabwe Pub. House, 1999 – History – 180 pages The Akan goldfields, according to Peter Bakewell, were the "highly auriferous area in the forest country between the Komoe and Volta rivers." The Akan goldfield was one of three principal goldfields in the region, along with the Bambuk goldfield, and the Bure goldfield.
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Auriferous copper was discovered in 1926 by W.H. Shetland in the Crystal Oak mine, and the hand- picked ore was railed to Charters Towers for treatment between 1928 and 1930. By mid-1931 of sinking and driving on lode material had resulted in of picked gold and copper-bearing ore from about of actual material broken. This just paid costs. The Lucky Hit mineral claim near Mount Hope was the second to be pegged on the Lolworth Creek field and caused a mild influx of diggers.
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The extent of Box- Ironbark Forest in 2001 (source: Environment Conservation Council) Box–ironbark forest is found on rocky, often auriferous (gold-bearing), soils, in flat and undulating landscapes at altitudes of 150–600 m above sea level, and with an average annual rainfall of 500–800 mm. About 40% of the area formerly supporting the ecosystem in Victoria is public land with less than 20% protected in conservation reserves. About 55% has been permanently cleared for agriculture, mining and urban development. Remaining forest has been fragmented.
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The Palmer River Gold Company N.L., a Cairns company, took up ground along the Palmer River between Frome and Strathleven and carried out dredging operations between 1926 and 1935. The company originally estimated that 2.6 million cubic metres of auriferous material (rocks bearing gold) was available but after four years work it was found that the yields were less than 25% of the anticipated values. A total of of gold was won during this period. The all-steel bucket dredge and pontoon was built by Messrs Chas.
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The field's Warden, Charles Price stated :"the whole of the miners are enthusiastic in the praise of Mr Hardman;... every case when he has marked on his plan that auriferous deposits would be found... the result has proved the correctness of his opinion... Nowhere else have they found more than colours."1 Back in 1872, the Government of Western Australia had offered a reward of £5000 for the discovery of the colony's first payable goldfield, with a number of conditions attached. In January 1885, Johnston lodged a claim for the reward, on the grounds that :"while in command of the Kimberley Survey Parties in 1884 I discovered a large area of auriferous country".2 When Hardman learned of Johnston's claim, he lodged one himself, countering Johnston's claim with the statement :"not only did he make no discoveries of gold in the district,... he constantly decried the idea of gold being found at all; sneered at all my efforts to prospect the country; and was with the utmost difficulty persuaded to afford me any assistance...."3 Consideration of the claims were deferred until May 1888.
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As a youth Belt became actively interested in natural history through the Tyneside Naturalists Field Club. In 1852 he went to Australia and for about eight years worked at the gold-diggings, where he acquired a practical knowledge of ore deposits. In 1860 he proceeded to Nova Scotia to take charge of some gold-mines, and there met with a serious injury, which led to his return to England. In 1861 Belt issued a separate work entitled Mineral Veins: an Enquiry into their Origin, founded on a Study of the Auriferous Quartz Veins of Australia.
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Chalk Bluff is the name of the ridge which lies between Greenhorn and Steephollow Creeks in Nevada County. It runs in a northeasterly direction for about 10 miles, and sits atop a "lead" of auriferous gravel, which intersects the fabled "Blue Lead" which runs from the San Juan Ridge through Red Dog and You Bet towards Placer County.MacBoyle, Errol (1918) Mines and Mineral Resources of Nevada County, pp. 30-3, 63-6; Thompson, Thomas H. and West, Albert A. (1970 ed.) History of Nevada County-1880, p. 179.
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In 1874, following goldfield regulations, a business area was marked out in an area believed to be non-auriferous. In 1877 when Charters Towers petitioned for incorporation as a municipality (the Borough of Charters Towers), this business area was defined as covering one square mile, measured as a half mile in each compass direction from the intersection of Gill and Mosman Streets. This area was the key business and social centre of the town. The economics of Charters Towers were closely bound up with the geology of the field.
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Peak Hill is the name of a goldfield,Clarke, E. de C.(1913) Geological report on Mikhaburra (Holden's Find), Peak Hill goldfield. Bulletin (Geological Survey of Western Australia), No. 59, 1914, Report 37 locality and the site of a gold miningHeydon, P. R. (1991) Gold at Peak Hill Carlisle, W.A : Hesperian Press, ghost town in the Murchison Region of Western Australia. The gold mine covers 2,162 hectares and consists of four open-cut mines, titled Main, Jubilee, Fiveways and Harmony. In the adjacent region to the locality there are considerable non auriferous mineral deposits.
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Mining is via conventional drill and blast mining via face shovels and dump trucks. Around 15 million tonnes of rock are moved in any given year, consisting primarily of waste rock. Gold within the Golden Mile lode system is unusual in that it is present as telluride minerals within pyrite. In order to recover the gold, the ore must be crushed, passed through a gravity circuit to recover the free gold present in some of the higher-grade lodes, and then subjected to flotation to produce an auriferous pyrite-telluride concentrate.
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Read online used to describe metallic objects formed by casting. Others trace its roots to the Egyptian name kēme (hieroglyphic 𓆎𓅓𓏏𓊖 khmi ), meaning 'black earth' which refers to the fertile and auriferous soil of the Nile valley, as opposed to red desert sand. According to the Egyptologist Wallis Budge, the Arabic word al-kīmiyaʾ actually means "the Egyptian [science]", borrowing from the Coptic word for "Egypt", kēme (or its equivalent in the Mediaeval Bohairic dialect of Coptic, khēme). This Coptic word derives from Demotic kmỉ, itself from ancient Egyptian kmt.
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Lyall's Jewellery Shop is a small masonry shop built in 1897 for David Lyall to replace his previous jewellery shop on the same site. Constructed at the height of Charters Towers' prosperity, it is notable for its elaborate frontage featuring large display windows of curved plate glass. The Charters Towers gold field was discovered in late 1871 and by 1872 there was a major rush on the field. In 1874, according to goldfield regulations, the business area of the town was set out on an area thought to be non- auriferous (not containing gold).
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During this time Charters Towers yielded of gold; more than half the total Queensland production. The Australian Joint Stock Bank was established with the discovery of gold in southern states and opened branches on Queensland goldfields as they were discovered. It opened a branch on the Broughton goldfield on 23 April 1872, but soon moved to Charters Towers and then to nearby Millchester, where crushing plants, banks and businesses had begun to cluster. In 1874, following goldfield regulations, a business area was marked out in Charters Towers over an area believed to be non-auriferous.
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The Romans also used water power in an unexpected way during mining operations. It's known from the writings of Pliny the Elder that they exploited the alluvial gold deposits of north-west Spain soon after the conquest of the region in 25 BC using large-scale hydraulic mining methods. The spectacular gold mine at Las Medulas was worked by no fewer than seven long aqueducts cut into the surrounding mountains, the water being played directly onto the soft auriferous ore. The outflow was channelled into sluice boxes, and the heavier gold collected on rough pavements.
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Stores owned by Dehn, Armbrust and Shepherd traded at Top Camp. The original shallow alluvial area at Lower Camp covered less than 0.4ha and by 1916 most miners either had returned to Plutoville, prospecting the surrounding countryside, or had left the region altogether. In 1922, a group of miners attempted to locate the main leader's northern extension beneath the mantle of Mesozoic sediments. After sinking several shafts, they came across an auriferous lead at a depth of and at a distance of from a reef, which provided rich specimen stone.
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Iron – Small and sporadic occurrence of iron are known to occur in several parts of district but are of hardly any economic important. Iron ore, rich in haematite, and magnetic ore, with haematite and siderite, also occur in the district. Graphite – In the past this mineral, also known as plumbago, found mostly in patti Lohba, was used as a dye but no large deposits have been noticed for a long time. Gold – Although no gold mines has been discovered in the district, the sands of Alaknanda and the Pinddar are said to be auriferous to a limited extent.
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117-132 (1867), On the Auriferous Rocks and Drifts of Victoria before returning to Scotland where he reported on the gold discovered at Kildonan, Sutherland.Transactions of the Geological Society of Glasgow, 4, pp.1-17 (1871), On the Sutherlandshire Gold Fields From discussions with miners he wrote reports for the North British Daily Mail which led to a Royal Commission on the Truck Acts. He then went to report as a war correspondent with the French army on the Franco-German War, but was arrested as a spy, condemned to death, and only freed after strenuous diplomatic representations.
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Santo Antônio do Rio Abaixo came about with its clusters of houses occupying a space between the rough edges of an auriferous river and the slopes of small hills. The expedition that founded Santo Antônio do Rio Abaixo consisted of families of Portuguese explorers Duarte and Alvarenga. The pioneers started mining gold in the lands of the Morro Grande Farm, building, on the right bank of a river, a chapel to St. Anthony and also their huts, thus forming a small village. Because it was built following the currents of water, it was named Santo Antônio do Rio Abaixo.
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As the ice melts, great furrows and ditches are formed on the glacier, and the water flowing from these and falling over the ice front forms waterfalls which churn up the gravel and carry it down the valley, so that the bed rock is often laid bare. As the front of the ice recedes, this vigorous erosion is brought to bear upon successively higher parts of the valley. This action was of economic importance, since it prevents accumulations of auriferous gravels within areas in which it operates—a fact which was proved by prospecting. Miller and Glacier creeks flow into Sixtymile.
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The Roasting Pits Complex is located approximately 10 km north of Hill End township and approximately 2.5 km north of Valentine's Mine which acted as the main source of auriferous quartz. It sits within a small gently sloping valley, straddling a shallow watercourse. The site comprises a pair of kilns, a battery building which housed ore crushing machinery, a dam and the remains of two houses where the manager and various workers lived while the site was in operation. The Battery and Roasting Pits form the visual focus of the site, as they would have in the 1850s.
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The same year Atkinson read a paper before the British Association On the Volcanoes of Central Asia. He was also elected a fellow of the Royal Geographical Society and in 1859 a fellow of the Geological Society and the Ethnographic Society. He was also elected to membership of the exclusive Geographical Club. To the Proceedings of the RGS he contributed in 1859 a paper on a Journey through some of the highest Passes in the Ala-tu and Ac-tu Mountains in Chinese Tartary, and in the Journal of the Geological Society in 1860 he wrote On some Bronze Relics found in an Auriferous Sand in Siberia.
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Someșul Mic (formed by the confluence of Someșul Rece with Someșul Cald) originates in the Apuseni Mountains, and Someșul Mare springs from the Rodna Mountains. Someșul Mare has a length of 130 km and an area of 5,033 km2 and a slight asymmetry in favor of the left side of the basin. For the entire basin of Someș, the asymmetry on left becomes pronounced between Dej and Ardusat to change in the opposite direction after receiving the Lăpuș on the right side. The valley of Someșul Mare has much auriferous alluvium that, until the early 20th century, were brought to the surface using traditional tools.
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"Vedic creationism in America" , Frontline, Vol 23, Issue 01, Jan. 14 - 27, 2006 (India) and argues that humans have lived on Earth for millions of years. In case of artifacts allegedly found in the Eocene auriferous gravels of Table Mountain, California and discussed in his book Forbidden Archeology, Cremo argues for the existence of modern man on Earth as long as 30 to 40 million years ago. Forbidden Archeology, which he wrote with Richard L. Thompson, has attracted attention from mainstream scholars who have criticized the views given on archeologyBradley T. Lepper, Hidden History, Hidden Agenda, Talk OriginsCreationism: The Hindu View, Colin Groves and describe it as pseudoscientific.
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His early mining experiences were in Alaska, California, and Oregon, as well as Colombia, Honduras, and Peru. He opened an office in San Francisco in 1917, and shortly thereafter, joined the United States Army Corps of Engineers, attaining the rank of major during World War I. In 1921, upon returning from an assignment in British Columbia, Haley was retained by the California State Mining Bureau to document California's gold placers. After conducting the study, he authored Gold placers of California: California State Mining Bureau Bulletin 92 and Topographic map of Sierra Nevada gold belt showing distribution of the auriferous gravels, in 1923. One of his articles also appeared in the journal, Mining and Scientific Press.
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Heinrich of Meissen (died 24 June 1240) was Bishop of Meissen from December 1228 to his death. Heinrich was probably a member of the Von Plaue family, ministeriales of the Archbishop of Magdeburg. Before his elevation, he was provost of the Magdeburg Cathedral chapter.Christian Hillen: Heinrich in: Institut für Sächsische Geschichte und Volkskunde (ed.): Sächsische Biografie He seems to have enjoyed the favour of the Emperor Frederick II, who granted him the rights to the metal mines discovered within the boundaries of the church of Meissen, as well as to auriferous, or gold-bearing, rivers and bodies of waters: in the deed of grant the Emperor refers to the bishop as dilectus princeps ("beloved prince").
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The bed rock of the whole basin consists of the limestones and schists of the Nome group, including many veins and stringers of quartz, some of which are known to be auriferous (gold-bearing). The river occupies a broad and deeply gravel-filled valley, in the floor of which the stream bed is trenched to a depth of , leaving well-marked gravel terraces and benches through nearly the whole length. In the lower part of the valley, the stream has cut to bed rock through the gravel deposits in only a few places, but in the headwaters region the gravels overlie broad rock-cut lynches on both banks. Dawson Gulch joins the river nearly opposite Big Four Creek, which is named after its first four prospectors.
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Asking how the thing they carried was called, the natives responded that it was a chitarero. When the area was occupied by Pedro de Ursúa and Ortún Velasco in 1549, they reduced the primitive settlers to the regime of encomiendas. Around 100 groups or capitanejos were distributed in 53 encomiendas through all the territory, according to investigator Jaramillo Uribe. The town's location allowed it to become an important commercial route between the Viceroyalty of New Granada and the Captaincy of Venezuela, with territories of great fertility and auriferous deposits in the mountains, it became one of the richest territories of the colony, only competed by the province of Socorro, which contributed to that outside considered a political and administrative axis of the Spanish crown from the time of the conquest.
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Gold was first detected in Western Australia in 1848 in specimens sent for assay to Adelaide from copper and lead deposits found in the bed of the Murchison River, near Northampton, by explorer James Perry Walcott, a member of A. C. Gregory's party. > In 1852–53 rich specimens of gold-bearing stone were found by shepherds and > others in the eastern districts, but they were unable afterwards to locate > the places where the stone was discovered. The late Hon A. C. Gregory found > traces of gold in quartz in the Bowes River in 1854. In 1861 Mr Panton found > near Northam, while shortly afterwards a shepherd brought in rich specimens > of auriferous quartz which he had found to the eastward of Northam, but he > failed to locate the spot again.
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The coat of arms of the state of Bolívar The coat of arms of Bolívar State is divided horizontally into two fields in blue and gold. The blue color in the upper part symbolizes the sky, while the gold in the lower part signifies the auriferous riches of the Guayana Region. In the upper part of the blue field forming an arch are eight stars representing the seven provinces that were considered in 1811 to declare the National Independence with the eighth star symbolizing the Guayana Province.E-Bolivar.bov.ve: Simbolos (Wayback) The lower field depicts a gold river representing the Orinoco and rising out of it, a big rock known as the Middle Rock, on top of which an indigenous female is resting her left arm on a clay vessel, pouring water on the river representing the endless flow of the Orinoco.
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At the surface were several veins at distances varying from three to twenty feet. At greater depth, these branching fissures united to form an irregular vein, with a tendency to send off shoots into the surrounding rock, chiefly into the foot-wall side. The foot-wall streak often contained high grade ore. The auriferous iron sulfide was finely disseminated through the quartz.Los Angeles Mining Review, June 1, 1907 In 1881 with the arrival of the California Southern Railroad nearby at Pinacate a five-stamp mill was constructed to crush the ore from the mine and developed the underground quartz deposit. In the 1890s an eastern corporation, the Good Hope Mining Company, took control and brought in a twenty stamp mill which was powered by coal from nearby Terra Cotta, California.Bill McBurney, Good Hope Mine, The Valley News, Friday, March 27th, 2009. Issue 13, Volume 13.
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After visiting, John Muir wrote in his book, The Mountains of California (1894): > "MURPHY'S CAMP is a curious old mining-town in Calaveras County, at an > elevation of above the sea, situated like a nest in the center of a rough, > gravelly region, rich in gold. Granites, slates, lavas, limestone, iron > ores, quartz veins, auriferous gravels, remnants of dead fire-rivers and > dead water-rivers are developed here side by side within a radius of a few > miles, and placed invitingly open before the student like a book, while the > people and the region beyond the camp furnish mines of study of never- > failing interest and variety." Like many other mining towns, fire was its bane and the town was destroyed three times by flames, in 1859, 1874, and 1893. After the second major fire, there was little gold left to mine, and so the town was never rebuilt to its boomtown condition.
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He examined and reported on the auriferous (gold-bearing) rivers, the turquoise mines, the forests and the fossil beds of France. He devised the method of tinning iron that is still employed, and investigated the differences between iron and steel, correctly showing that the amount of carbon is greatest in cast iron, less in steel, and least in wrought iron. His book on this subject (1722) was translated into English and German. He was noted for a thermometer he constructed on the principle of taking the freezing point of water as 0°, and graduating the tube into degrees each of which was one-thousandth of the volume contained by the bulb and tube up to the zero mark. It was an accident dependent on the particular alcohol employed which made the boiling-point of water 80°; mercurial thermometers graduated into 80 equal parts between the freezing- and boiling-points of water are named Réaumur thermometers but diverge from his design and intention.
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The Aspasia Mine, west of Durham on the former Etheridge Gold and Mineral Field, was worked from 1916 to 1929, during the 1930s, and between 1947 and 1952, producing gold, silver, lead and copper. The Etheridge was an unusually large gold/mineral field and the rushes were widely scattered. The first recorded gold in the district was found by geologist Richard Daintree in 1867 near present-day Georgetown. A series of other gold and base metal discoveries followed and after publication early in 1869 of Daintree's report of discoveries of gold on the Gilbert River, the first rush began. By July 1869 a population of 3,000 were mining the rivers for alluvial gold, and by November 1870 reef mining had commenced. By late 1871, the township of Etheridge (later Georgetown) had a population of 600. The Etheridge Goldfield was proclaimed officially on 18 January 1872, with Georgetown designated the administrative centre. In 1872 the Durham area, just west of Georgetown, was developed with more than 44 separate auriferous reefs being worked and crushing machinery set up in Georgetown.
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Fragment of Bayuda Desert seen from space Bayuda desert with some acacian trees Desert well used by Bisharin nomadic pastoralists The Bayuda Desert, located at , is in the eastern region of the Sahara Desert, spanning approximately 100,000 km² of NE Sudan north of Omdurman and south of Korti, embraced by the great bend of the Nile in the N, E and S and limited by the Wadi Muqaddam in the W. The north to south aligned Wadi Abu Dom divides the Bayuda Desert into the eastern Bayuda Volcanic Field and the western ochre- coloured sand-sheets scattered with rocky outcrop. Description of the Bayuda Desert Gold mining occurs today from October to March, as labourers work auriferous quartz found in wadis and shallow mines. These workings are usually in areas previously worked during the New Kingdom of Egypt and the Early Arab Period. In July 2020, it was found that gold hunters had used heavy machinery at the Jabal Maragha archaeological site in the Bayuda Desert, destroying it by digging a huge trench.
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