where can I buy Irish mined and stamped Gold or Silver bullion?

You might want to look at collector coins.

https://www.collectorcoins.ie/

https://www.collectorcoins.ie/en/shop/type/gold-proof.html

They are issued by the central bank and are legal tender. I guess its
the closest to "irish gold".

You can go gold hunting in wicklow, waterford, wexford. Your legally
allowed to keep a small bit of gold as a sovereign. ( you need land permission)

If you want to buy gold to hedge against an economic down turn buying,
real gold is not worth it.
You can buy a tiny bit if you like by post, a couple of gold bullion coins however
its a poor bet against the economy.


Here's a little bit of "Gold trivia". ( Using the UK as an example )

"1966: Britain starts prosecuting gold-coin investors
Two decades after the war ended, and 35 years after Britain quit the Gold Standard, its politicians were busy meddling with gold investment. Because the Pound was falling on the currency markets. So people were buying gold, sending money overseas to buy it and so hurting the UK's already terrible balance of trade. Thereby hurting the Pound yet again.

To try and stem the slide, the Labour government put a block on imports of gold coin, and banned private citizens from owning more than four gold coins. Anyone with a bigger collection had to tell the Bank of England, whose officers would then judge whether the owner was a true collector, or a speculator."

https://www.bullionvault.com/gold-news/gold-confiscation-120720125
https://www.telegraph.co.uk/finance/personalfinance/investing/gold/9957508/Could-the-Government-confiscate-your-gold.html