national geographic channel megastructures season 2 to extract the black gold. it looks at the various mega machines and systems that are used to extract transport and the process used to
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the amalgam process is the oldest technical method of extracting gold and was used in antiquity. with the amalgam process the gold bearing rock is likewise crushed to fine sand. afterwards mercury is added to the rock dust. gold has the property that enables it to join to the surface of the mercury.
however some of the best deals at costco are on the actual brand name items. they sell the kerry gold butter you mentioned at my local costco. and for those who do like cheese the papillion roquefort is cheaper than i used to buy it in lyon (and much preferred to society the brand usually available at even specialty retailers).
extract gold releasing large amounts of the toxic element into the environment. alternatives to mercury have been suggested over the years to little avail. a group of miners in the philippines has demonstrated that borax when used as a flux for smelting gold out of heavy mineral concentrates is an effective and safer substitute for mercury.