sentences:  For many years, no copper or silver coins were minted at all, and in 1775 King George III had halted the production of copper coinage at the Royal Mint.In 1768, one of the largest veins of copper in the world was found at Parys Mountain on the island of Anglesey in the northwest of Wales.In 1785, Thomas Williams (the "Copper King"), acting as a representative of the Parys Mine Company, met with the master of the British mint to propose that regal copper coins be struck using a counterfeit-deterrent method of edge lettering, and offering this technology to the mint free of charge.