Prince Harry visits Angola minefields
Updated Sunday, August 18th 2013 at 11:34 GMT +3
Its chief executive Guy Willoughby said: "He [the prince] is irritated about the countries that supplied these landmines are not actually putting in any funds to clear them 25 years later.
"He has got quite a bee in his bonnet about that, and that is good.
"The commitment shown by Prince Harry plays an invaluable role in helping us to raise awareness of Halo's work and mission.
"He is technically very competent but he's also very good with dealing with the people, the villagers, the de-miners and he understands the big issue, even the political issue.
"Wars may be over but many people are still unable to resume their normal lives, facing the threat of death or injury by landmines every day."
He told BBC News that being able to support the charity was "hugely important" to Prince Harry, not just because of the family connection.
"As a soldier he is seeing so many people of his generation, of his age losing limbs. And that has really brought a focus on it.
"I think it has brought a focus on it for a lot of the British population of seeing so many people in their 20s who are losing limbs."
Angola's civil war left an estimated 500,000 dead, displaced four million and destroyed much of the country's infrastructure.
Despite huge efforts since the war ended in 2002 to clear the explosives, the country remains one of the most heavily mined in the world.
The Halo Trust said it has destroyed more than 21,300 anti-personnel and anti-tank mines in Angola but thousands of residents have been killed or maimed.
Mr Willoughby said Halo was making "excellent progress" in Angola and the province of Huambo was now close to becoming mine-free, but there was still 19 years of clearance work to be done across the country as a whole.