The history of Zika virus. The rise in the spread of Zika virus has been accompanied by a rise in cases of microcephaly and Guillain-BarrÃ© syndrome. First identified in Uganda in 1947 in monkeys, Zika was later identified in humans in 1952. The first large outbreak of disease caused by Zika infection was reported from the Island of Yap in 2007. There are currently several countries experiencing Zika virus outbreaks.
In 2014, copper mining produced about 15 metric tons of gold, worth $600 million, which represented 7% of US gold production. Other byproducts of the copper extraction process included silver, and minor amounts of rhenium and platinum-group metals.Sulfuric acid is recovered at copper smelters.opper mining activity increased in the early 2000s because of increased price: the price increased from an average of $0.76 per pound for the year 2002, to $3.02 per pound for 2007.
Note: these visualizations are a couple of years old and optimistically have the value of gold pegged at US$2,000 per oz, presumably for the ease of calculations. For those interested, we have also put together a similar slideshow on the topic, showing how much gold, silver, copper, and other metals are mined each year. Smaller denominations of gold plates: 1 gram, 5 grams, 10 grams, 20 grams, and 1 troy oz of gold. Larger denominations of gold plates: 50 grams, 100 grams, 250 grams, 500 grams, and 1 kg of gold. This 400 oz gold bar, at $2,000 per oz gold, is worth the $800,000 cash beside it. The gold bar is extremely heavy, weighing more than three ...