Once you take your sack of ore to a ball mill site, the miner usually pays the owner PHP10-PHP15 per drum, which will be used to process the ores. Mercury is added to the ores as they are grinded inside the drums, the substance separates the gold from the ores. The process takes two hours to finish, after which the ball mill fries the mercury using an air compressor to get the gold inside. They used borax to clean the gold. After that, they use a small weighing scale to determine the weight of the gold that was extracted. The entire process can takes about half a day, or sometimes only three hours, depending on the hardness of the ore.
http://manila.coconuts.co/2016/04/20/diwatas-mt-diwalwal
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