Elba Park opened to the public last month after £25m was spent on the reclamation of contaminated land at Lambton colliery and cokeworks near Sunderland.
Contractors moved more than two million cubic metres of soil, planted 77,000 trees and created 37km of winding footpaths.
The park was named after a village that once stood by a curve, or elbow, of a railway line. The mine ground to a halt in the 1980s, when buildings were demolished and the land left derelict.
At the centre of the site there now stands a memorial by the artist Colin Wilbourn to the 127 pitmen known to have lost their lives during the mine's 364-year history. Nearby stands a series of wrought-iron sculptures in the style of miners' banners, while a new bridge over the burn includes a handrail made from miners' pickaxes.
The Homes & Communities Agency spent millions on the land reclamation it called a "green island and wildlife corridor". More than 350 houses are being built on an adjacent part of the site.
The agency handed over responsibility for the park to the Land Trust, which will work with Groundwork North East to manage the site. "We worked closely with local people over the past seven years to create this park," said Gill Hay, investment and regeneration manager at the agency.
Land Trust chief executive Euan Hall added: "We safeguard public spaces at a local level, in line with the ideals of localism and the 'Big Society' we hear so much about."