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The goldline darter (Percina aurolineata) is a small species of freshwater ray-finned fish, a darter from the subfamily Etheostomatinae, part of the family Percidae, which also contains the perches, ruffes and pikeperches.
For instance, the consumption of fine jewelry leads to increased mining of gold and diamonds. The extraction of precious metals like gold has degradation effects on the environment, such as loss of forestry during construction of the mining facilities, increased exposure to toxic materials, and disturbance of the nearby ecosystem. [10]
Other gold rushes occurred in Papua New Guinea, Australia at least four times, Fiji, [3] South Africa and South America. In all cases, the gold rush was sparked by idle prospecting for gold and minerals which, when the prospector was successful, generated 'gold fever' and saw a wave of prospectors comb the countryside.
Line 12, also known as the Golden Line from its color on the system map, is a rapid transit line of the Mexico City Metro network. It travels 25.1 kilometers (15.6 mi) along the boroughs of Benito Juárez , Iztapalapa and Tláhuac in southwestern, central-southern and southeastern Mexico City , serving twenty stations.
Gold occurs principally as a native metal, i.e., gold itself.Sometimes it is alloyed to a greater or lesser extent with silver, which is called electrum.Native gold can occur as sizeable nuggets, as fine grains or flakes in alluvial deposits, or as grains or microscopic particles (known as colour) embedded in rock minerals.
A variety of gold deposits are formed in accretionary orogens, including orogenic gold deposits. [38] Orogenic gold deposits are typically located in metamorphosed fore-arc and back-arc regions, as well as in the arc [3] and show a close spatial relationship to lamprophyres and associated felsic porphyry dikes and sills. [39]
The invisible nature of the gold in the deposit makes it difficult to find deposits of that kind. The class of deposit was defined after the Carlin mine became a mass producer of gold in the 1960s and it was recognized that other deposits of that type should exist. [5] Most of the mines in the Great Basin in the United States belong to the ...
Environment destruction caused by humans is a global, ongoing problem. [4] Water pollution also cause problems to marine life. [5] Some scholars believe that the projected peak global population of roughly 9-10 billion people could live sustainably within the earth's ecosystems if humans worked to live sustainably within planetary boundaries.