In the coastal areas of the Philippines, much of the clay containing the gold ore is below the water table. This means most mining activity must take place under water. In modern times, successful mining involves cheating the sea with low-tech techniques borrowed from local fisherman.
Iron ore, one of the Philippines' largest mineral deposits, is not being extracted at present. Mineral Deposits Found In The Philippines | Crusher Mills … Geology and Nonfuel Mineral Deposits of Asia and the Pacific. porphyry copper-gold and gold deposits of the Philippines, Papua New Guinea …
There, the ore was being crushed by hand methods and panned down to extract the gold. And while they were recovering goodly amounts of gold for their effort, John and I still could not identify any commercial opportunity for the type of mining that we do.
Therefore whenever gold is found encased in pyrite, it is always present as free gold and not as some type of gold sulphide. Gold is also found at times in chalcopyrite, galena and arsenopyrite and stibnite, but not as a rule in such large amounts as may be found in pyrite.