Components of existing infrastructure are re-used by virtually every manufacturing/processing company in the world performing plant/manufacturing upgrades. Further, any affirmation based solely on the size and age, that an existing tunnel does not possess monetary value is ludicrous.
Old mines have been abandoned and successfully re-mined for as long as precious metals have had value. Mines are not necessarily abandoned because they simply ran out of resources/product as alluded to in Derb's post. There are numerous factors like war, depression, lack of technical advancement, etc. that have contributed to mine closures throughout history.
Derb: Do some research on the above and you will find this to be factual...but I think in your heart of hearts, you are already aware of these facts.
Oh, you said "working down 'dip' hence 'their' running into water". Existing mines are de-watered frequently aren't they, or do companies just start over every time water is encountered?
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