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Gold (Au) is ubiquitous in the environment and mined commercially at numerous locations worldwide. It is also an allergen that induces dermatitis in sensitive individuals. Gold concentrations were comparatively elevated in samples collected near gold mining and processing facilities, although no data were found for birds and non-human mammals. Maximum gold concentrations reported in abiotic materials were 0.001 microg L(-1) in rainwater; 0.0015 microg L(-1) in seawater near hydrothermal vents vs. < 0.00004-0.0007 microg L(-1) elsewhere; 5.0 microg kg(-1) dry weight (DW) in the Earth's crust; 19.0 microg L(-1) in a freshwater stream near a gold mining site; 440 microg kg(-1) DW in atmospheric dust near a high traffic road; 843 microg kg(-1) DW in alluvial soil near a Nevada gold mine vs. < 29 microg kg(-1) DW premining; 2.53 mg kg(-1) DW in snow near a Russian smelter vs. < 0.35 mg kg(-1) DW at a reference site; 4.5 mg kg(-1) DW in sewage sludge; 28.7 mg kg(-1) DW in polymetallic sulfides from the ocean floor; and 256.0 mg kg(-1) DW in freshwater sediments near a gold mine tailings pile vs. < 5 microg kg(-1) DW prior to mining. In plants, elevated concentrations of 19 microg Au kg(-1) DW were reported in terrestrial vegetation near gold mining operations vs. < 4 microg kg(-1) DW at a reference site; 37 microg kg(-1) DW in aquatic bryophytes downstream from a gold mine; 150 microg Au kg(-1) DW in leaves of beans grown in soil containing 170 microg kg(-1) DW; up to 1.06 mg kg(-1) DW in algal mats of rivers receiving gold mine wastes; and 0.1-100 mg kg(-1) DW in selected gold accumulator plants. Fish and aquatic invertebrates contained 0.1-38.0 microg Au kg(-1) DW. In humans, gold concentrations up to 1.1 microg L(-1) were documented in urine of dental technicians vs. 0.002-0.85 microg L(-1) in reference populations; 2.1 microg L(-1) in breast milk, attributed to gold dental fillings and jewelry of mothers; 1.4 mg kg(-1) DW in hair of goldsmiths vs. a normal range of 6-880 microg kg(-1) DW; 2.39 mg L(-1) in whole blood of rheumatoid arthritis patients receiving gold thiol drugs to reduce inflammation (chrysotherapy) vs. a normal range of 0.2-2.0 microg L(-1); and 60.0 to 233.0 mg kg(-1) fresh weight (FW) in kidneys of rheumatoid arthritis patients undergoing active chrysotherapy vs. < 42.0 mg kg(-1) FW kidney 140 months posttreatment.
Since the 1990s, most of the U.S. gymnastics teams at the Olympics have had at least two women of color. In 2012, Gabby Douglas became the first Black woman to win the Olympic gold medal in the all-around competition. And Biles, who is Black, has been the top U.S. women's gymnast for a decade.
Important historic objects related to Jones' life and naval career are exhibited in niches around the periphery of the circular space. Visitors to the Naval Academy today can see an original marble copy of the Houdon portrait bust, the gold medal awarded to Jones by the Congress in 1787, the gold-hilted presentation sword given by Louis XVI of France and Jones' commission as Captain, Continental (U.S.) Navy, signed by John Hancock. Here, too, is a plaque to Ambassador Porter, who was responsible for repatriating the great naval leader.
Polymetallic sulphides (sometimes called sea floor massive sulphides or SMS) are rich in copper, iron, zinc, silver and gold. Deposits are found at tectonic plate boundaries along the mid-ocean ridges, back-arc ridges and active volcanic arcs, typically at water depths of around 2,000 metres for mid-ocean ridges. These deposits formed over thousands of years through hydrothermal activity, when metals precipitated from water discharged from the Earth's crust through hot springs at temperatures of up to 400'C. Because of the black plumes formed by the activity, these hydrothermal vents are often referred to as 'black smokers'. Active hydrothermal vents form unique ecosystems. Chemosynthetic bacteria, which use hydrogen sulphide as their energy source, form the basis of the vent food web, which is comprised of a variety of giant tube worms, crustaceans, molluscs and other species. Many vent species are considered endemic to vent sites, and hydrothermal vent habitats are thus considered to hold intrinsic scientific value.
Watching the 27-year-old stay on the court has been gift enough. Over the past two and a half seasons -- a run of three All-Star selections, a 2014 FIBA World Cup gold medal, 28 NBA playoff games and one title (so far) -- Curry has missed a measly two games due to ankle-related concerns. The first came in November 2013, as a precaution for a left ankle bone bruise. The second was in February 2015, after his right foot landed on Boris Diaw's left. And that's it.
February 5, 2008 - The bell has rung and bodies are flying, but who will be the last gamer standing in THQ's WWE SmackDown vs. Raw 2008 International Tournament, presented by HMV. Starting Saturday, February 9, the top 32 teams from each participating region - North America, the United Kingdom and Europe - will begin battle in a virtual ring for the ultimate prize of two highly coveted floor tickets to WrestleMania 24 on March 30, 2008 in Orlando, Florida, USA.
The most shocking moment of the women's gymnastics individual event finals was not when Romanian Sandra Izbasa beat favorite and reigning world champion Shawn Johnson out of a gold medal on floor exercise. Though Johnson's routine had a higher start value, Izbasa's was executed more flawlessly, gleaning her the top spot.
The brutality of the sport was acknowledged when Liukin and Johnson were asked by Bob Costas after their medal-winning performances in the all-around if they planned to stay in the sport until the London 2012 Games. They responded by saying, "If our bodies hold up."
I haven't heard any teenage swimmers wondering whether or not their bodies will last until the next Olympics. Dara Torres was 17 when she competed in her first games and won gold and she was considered to be something of a prodigy. It was expected that she would go on to compete in another Olympics.
The Vagran placer cluster is located on the eastern slope of Northern Urals. During > 100 years of gold mining history approximately 40 tons of gold have been extracted from the placer deposits. Bedrocks of the region consist of high metamorphic Upper Proterozoic and Paleozoic terrigeneous, terrigeneous-volcanogenic and igneous rocks. Gold placer deposits are mostly alluvial genesis deposits and of Quaternary to Oligocene (?) age. The alluvial deposits consist of gravel with pebbles, boulders, and sandy clay covered by sandy silt and a soil layer. The thickness of the alluvial sequence is usually 5-10 m and reaches 18 m in the main watercourses of the third order. Nearly all of the alluvial sediments are gold bearing but concentrations of economic importance prevail in the bottom part of the sequence above the bedrock. There are four different types of gold particles: (I) rounded and well-rounded particles of high fineness and homogeneous inner structure, (II) rounded to sub-rounded high fineness particles with a pure gold rim developed over a core, (III) crystallomorphic (idiomorphic) high fineness with a homogeneous inner structure, and (IV) irregular angular and subangular particles of medium fineness with a significant content of Ag (10-40 wt.%) and elevated Hg (up to 1.15 wt.%). The first type is prevalent and comprises up to 65% of the total gold particles; it is uniformly distributed throughout the territory. There are features with initially complicated dendritic and laminar shaped particles which were rounded during transportation. The second and third types have a propensity for zones of the inherited erosion-tectonic depressions. Apparently, types I, II and III are related with orogenic mesothermal gold-sulfide-quartz mineralization; the differences of these types depend on the primary zonation of ore bodies and supergenic transformation of the alloys. They were connected with middle-depth ore bodies of an orogenic gold-sulfide-quartz formation. The fourth type is evident of nearby transportation from primary sources and a short duration of supergenic influence. It is controlled by a zone of NW-SE orientation, diagonal to the main structures of Ural Fold Belt. The plot of Au content vs coefficient of heterogeneity (ratio of the Au content in the core and in the rim of the grains) is the distinguishing factor between the four types of gold grains both by primary hypogenetic characteristics and supergenetic features. No corresponding lode occurrence of gold-sulfide-quartz mineralization has been identified to date in this region. Placer gold concentrations are related to the intermediate hosts of the Mesozoic-Cenozoic surfaces of the Ural peneplain uplift in the Oligocene and eroded in Miocene-Quaternary time. This factor determines the widespread distribution of placer gold in the territory of the Vagran cluster. The large, Carlin-type Vorontsovsk gold deposit is located 60 km south-east from the Vagran area. It has a shallow erosional level, small size of native gold, and its distal location from the placer deposits makes it an unlikely primary source for the Vagran placers. However, mineralization of this type of deposit is noted within the cluster. Gold of the fourth type nearly resembles the gold of the Vorontsovsk deposit and, apparently, the source is related to the same hydrothermal mineralization event. ICP MS analyses of the quartz-sulfide lodes in the floor of gold-bearing valleys revealed a gold content of 2.0-6.9 g/t in the zone of type IV distribution. Therefore, gold of the fourth type can be used as an indicator for the exploration of primary bedrock mineralization. The geological setting and typomorphic features of this placer gold shows that the primary gold mineralization is similar to the Vorontsovsk deposit and within the zone of distribution of the placer gold of the fourth type.
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