A Gold Digger’s Guide to the Universe
The first documented use of gold by humans was found in the jewelery recovered from the Varna Necropolis in Bulgaria and dated to about 6,500 years ago. Since then, enough gold has been mined from Earth’s crust to form a cube 60 feet on a side.
Gold is one of the 100-odd basic elements in the universe. Number 79 in the element list, a cubic meter of it weighs 19 metric tons. Your ‘weight in gold’ would be worth over $2 million!
How much gold is there?
The most common ingredient to Earth’s crust is silicon. It makes up beach sand, granite, sandstone and the actually the entire lithosphere. By comparison, you have to sift through about 250 metric tons of this stuff to come up with a measly 1 gram (5 carats) of gold. This kind of a gold mine would be rated at 0.004 g/ton. Generally, industrial mining is only economically feasible if the rating is about 1gram/ton or higher! The best mines produce gold at ratios of 5 gm/ton or more when a rich ore vein is available.
How about sea water? For every 250 million liters of water —> Read More Here