The Prince of Wales and the Duchess of Cornwall have spent the fourth day of their summer tour visiting the mining memorial in Senghenydd.
A wide range of commemorative coins are being struck - from the rare kilo coin to the £5 silver which will be more readily available.
The two arrived late after their helicopter was forced to make an emergency landing minutes after taking off from central London.
Just twenty four hours after Prince Charles was accused of trying to influence government policy, he's begun his summer tour of Wales.
The Prince was said to have tried to change policies both in Westminster and with the Welsh Government.
Today the politics were replaced by promotion as he visited family-owned businesses in West Wales.
Alexandra Lodge reports from Carmarthenshire
Prince Charles has visited the Cnwd Food factory in Carmarthenshire.
During the tour of the site - which describes itself as a 'small gourmet food business', the Prince was shown how to fillet and smoke a fish.
Today sees the start of the Prince of Wales and Duchess of Cornwall's annual summer tour of Wales.
They are visiting three family businesses in Carmarthenshire and Pembrokeshire.
Former Labour cabinet minister, Peter Hain, said a shared an interest between him and Prince Charles meant the Prince 'tried to persuade the Welsh government' to introduce a trial for complementary medicine.
– Peter Hain MP
"When I was Secretary of State for Northern Ireland in 2005-7, he was delighted when I told him that since I was running the place I could more or less do what I wanted to do.
"I was able to introduce a trial for complementary medicine on the NHS, and it had spectacularly good results, that people's well-being and health was vastly improved.
"And when he learnt about this he was really enthusiastic and tried to persuade the Welsh government to do the same thing and the government in Whitehall to do the same thing for England, but not successfully."
Prince Charles tried to influence Welsh Government policy according to a former Welsh Secretary. Peter Hain said that the Prince 'wanted complementary medicine' and that he was seen as "being somebody that actually agreed with him on this, and might want to deliver it."
The Duchess of Cambridge has spoken publicly for the first time about how she felt on edge when Prince William was a pilot based at RAF Valley in Anglesey.
– Duchess of Cambridge
"I loved my time in Anglesey when William was serving with RAF Search and Rescue. I cannot pretend that I didn't feel anxious at times when William was on shift in howling gales, knowing that he was out flying in extremely challenging conditions, but he loved doing it and I always felt incredibly proud of him. I also knew that I was not alone and that there were many supportive Search and Rescue wives on Anglesey and at other bases across the country."
Her comments are part of a foreword to a book by three former RAF wives about what it's like to be a serving pilot's other half.
The Queen and the Duke of Edinburgh have concluded their two-day visit to South Wales with visits to the Valleys and the Vale of Glamorgan.
The Queen began her second day in Wales with a visit to a stationery firm at Ystrad Mynach.
International Greetings makes gift packaging and greetings cards.
The Queen and Prince Philip will go onto Atlantic College in the Vale of Glamorgan.
The Queen and the Duke of Edinburgh continue their tour of Wales today.
The royal couple will spend the second day of their two-day tour in Ystrad Mynach and Llantwit Major.
The Queen and the Duke of Edinburgh have been visiting *Pembrokeshire. *[Nearly 60 years since her first visit as Monarch, Her Majesty returned to visit the new Heritage centre there. It was the start of a two-day tour of Wales. Our reporter[ Alexandra Lodge](http://@LodgeA ) was there.