Some metals do a process known as "out-gassing" when heated. Lithium and gallium are prime examples. Mercury will out-gas as well when heated as an amalgam of gold and the metal can be later collected using a cooling retort in the cyanide extraction process. But, that's really not what he's asking about.
There are a lot of reasons gasses can accumulate in pockets in the earth. Most of them are organic processes from either recent times or prehistoric times. When you seal up a cave, for example, the air can stagnate and become toxic because plant an animal life which lived in the cave dies and decomposes. For that case, a simple opening of the cave and fresh air blown in are a good fix.
For natural gasses that seep in from an almost unlimited source underground, the cure may be far more expensive and make entry far riskier. A detailed analysis of the gasses must be done before anyone can advise him on the best cure.
His question is reasonable if you apply it in a general sense but as has been noted, gold and silver don't produce gasses. Thousands of other compounds do, however, and they can all probably be found with gold and silver.
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-GD
It's all about that magical moment of discovery when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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