Zinc is naturally present in water. The average zinc concentration in seawater is 0.6-5 ppb. Rivers generally contain between 5 and 10 ppb zinc. Algae contain 20-700 ppm, sea fish and shells contain 3-25 ppm, oysters contain 100-900 ppm and lobsters contain 7-50 ppm.
Cyanides (more exactly as cyanogenic glycozides) exist in cassavaroots, and fruit seeds as apricots, prunes, peaches, almonds etc. Cyanide is historically found in the seeds â¦of some fruits. Applesseeds contain cyanide, but a person would have to eat a lot ofapple seeds for the cyanide to have any negative effects. Cyanide is natural found in certain foods. This includes cassava,almonds, pits of some types of fruit, and Lima beans.
In 1998, approximately70% of gold recovered from cyanide use was from vat-leaching operations, about 30% fromheap-leaching operations. 3 All in all, cyanide leaching is now used to process over 90% ofgold ores (by weight) mined in the United States.4 The use of cyanide in mining is becoming more and more controversial.n 1998, approximately70% of gold recovered from cyanide use was from vat-leaching operations, about 30% fromheap-leaching operations. 3 All in all, cyanide leaching is now used to process over 90% ofgold ores (by weight) mined in the United States.