From: muratlanne@gmail.com   
      
   "Richard Smith"  wrote in message news:m1cydnvf9q.fsf@void.com...   
      
   I've seen videos of "artisanal" gold mining operations in South America.   
   The videos are/were motivated by trying to find an alternative to using   
   mercury to extract the gold, but anyway...   
   ------------------------   
      
   Panning or hydraulic gravity separation is a proven alternative as long as   
   the ore has been crushed fine enough to separate the rock from the metal,   
   mechanically or by tumbling stones in a stream bed. It's also used for lead   
   and tin.   
   https://unacademy.com/content/neet-ug/study-material/chemistry/d   
   tailed-information-on-the-methods-of-concentration-of-ores/   
      
   The average cost of mining US gold is over $1000 per ounce.   
   https://ibisingold.com/en/article/gold-mining-costs-have-reached   
   record-levels-what-is-next-for-the-metal   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)