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, one of the most fascinating elements on the earth today. has been used by humans for almost six thousand years and has been valued since the earliest of times for its beauty and resistance to corrosion. Without the economy of the world be drastically changed. ....

Middle of Essay
.... corrosion. "By at least the fourth millennium BC, gold was found through both placer and vein(lode) mining and by the time of the early cultures from which modern civilization is descended the search for gold was wide spread"(Green 1968). Gold is mainly extracted through mining. It is mainly found in tiny flakes or sands but sometimes is found in nuggets. The largest nugget ever found weighed eight kilograms. "Gold deposits are usually classified as lode, placer, massive or disseminated types" (Colliers Encyclopedia). "Lode deposits are mostly associated with acidic ingenous intrusives in rocks of the Precambrian to late Tertiary periods"(Gr ....