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    Hey Xeyla!
    thanks very much for the rep! very much appreciated!
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    Thank you very much for the rep, xeyla - much appreciated

    I will be very pleased if what I said ends up being useful to you in some way
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    Thanks for the rep xeyla. I was happy to help.
    It was fun searching through stuff to find out who did those maps. Also discovering that Mike Schley was not the one to originate them.
    Not sure if my caterpillar brushes were of use but hope they were.
    Cheers, John
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    Thanks for the rep!
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    Thank you for the rep!
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About xeyla

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How do I decide what resources are where?

by xeyla on 10-27-2014 at 06:39 PM
Quote Originally Posted by waldronate View Post
A lot of economically important minerals (lead, copper, silver, gold, tin, zinc, etc.) are associated with hydrothermal systems, as are many types of gems (beryls like emeralds, oxide gems like sapphires, and silica gems such opals are commonly formed in hydrothermal systems; diamonds are not).

Hydrothermal systems come in a number of forms, but the basic idea is that hot water dissolves out soluble things like the common metals and sulfur in the hot areas and deposits them in cooler

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How do I decide what resources are where?

by xeyla on 10-27-2014 at 06:34 PM
Quote Originally Posted by Adversary View Post
Gold is usually found with quartz (but unfortunately not the other way around) and granite which is are igneous materials so there would have to have been some magma near the surface of the earth. I have also heard that some gold was found in meteor impacts but I can't believe that would be a major source.

Marble on the other hand is metamorphosed sedimentary rock high in carbonates (think limestone). The original limestone was formed on a seabed with lots of shell forming creatures.

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Updated 10-27-2014 at 06:44 PM by xeyla

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