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.
The Queen has begun her two day visit to Wales at Narbeth in Pembrokeshire.
HRH stopped at Cotts Farm Equine Hospital - a purpose-built facility offering veterinary horse care.
The Queen and the Duke of Edinburgh begin a two-day tour of Wales today.
Nearly 60 years after her first visit to Wales, the Queen will return to Pembroke Dock to visit the new heritage centre and to unveil a 200-year timeline memorial wall.
The Royal couple will also visit Welsh spring water company Princes Gate and tour Picton Castle.
The Queen and the Duke of Edinburgh will visit South Wales next week, it has been announced.
They will spend two days in Pembrokeshire, Vale of Glamorgan and Caerphilly county on 29 and 30 April.
The couple will visit Prince's Gate Spring Water, in Narberth, Picton Castle, Haverfordwest, and Royal Dockyard Chapel, in Pembroke Dock.
On Wednesday they will visit Ystrad Mynach and Llantwit Major.
There's been a royal in our midst today, as Prince Edward visited Blaenau Gwent . He was there to officially open the Diamond Jubilee Square in Abertillery - part of the wider regeneration of the town.
It's just one of the examples of how money from Europe is being invested here, as Megan Boot reports.
The prince has arrived in Abertillery http://t.co/veSzEzq5C2
Prince Edward is visiting Abertillery to see the regeneration of St Michael's Church - which forms part of a £10m improvement project in the town.
With children from Queen Street school happy to give a welsh welcome http://t.co/kKF4yVOG3m
A South Wales Royal Navy commanding officer has brought his own ship to Cardiff for a visit.
A 133-metre long warship is at Brittania Quay in Cardiff until Sunday.
Andrew Block from Crickhowell will welcome invited guest aboard all weekend and today the public will have their chance to have a look around.
Prince Charles has unveiled a plaque at the restored and renamed Redhouse Town Hall in Merthyr Tydfil.
He told onlookers he is "very impressed" with the building.
One lady in Merthyr asked Prince Charles for a "selfie" with her but he said it would ruin her reputation! http://t.co/9APRGwKihf
The Prince's visit has seen him visit some of Wales' most historic buildings and meet people from communities in Pembrokeshire, Carmarthenshire and Merthyr Tydfil.
The Prince of Wales has arrived in Merthyr Tydfil as part of his St David's Day visit to Wales.
Earlier today, he visited Llanelly House in Llanelli.