Ffynnon Ddeuno stood on the Gatewen Estate near Broughton until it vanished from view under the spoil heap from a nearby coalmine.
The name of the well, or at least its spelling, varies to some degree. The RCAHMW database records it as Ddeuno as does Francis Jones, other records spell the name as Deuno. In 1699 Lhuyd reported it as Ffynnon Dheyno, suggesting that at one time a small chapel was said to have stood over it. Jones cites the Deeds of Gatewen 1738-1823 in which the farm is named Ffynnon Beuno, alias Capel Beuno; suggesting that the name Deuno may have been derived from Beuno through the Welsh habit of switching aspirants in relation to grammar. If the well was indeed to have been a Saint’s well then Baring-Gould’s Lives of British Saints does not record a St Ddeuno.
The well originally stood on the Gatewen Farm lands which were incorporated into the Gatewen Hall estate in the early 19th century by Thomas Hayes, who substantially enlarged the Hall and estate on the back of income received from the slave trade. the Hayes family having occupied Gatewen Hall since the 18th century.  The well was “rediscovered” in the 1870s by the Misses Hayes, daughters of then Hayes family owners. They restored it by constructing a new building over it, forming an arched roof with bench seats along either side of the well. Ivy and other trailing plants where grown over it.
Unfortunately, around the same time further coal seas were discovered in the area and the Gatewen colliery opened in 1877. The mine grew such that by 1908 the mine employed 800 men and by the 1920s over 1000 men. The pit eventually closed in 1932. However, the spoil heap from the colliery gradually encroached upon the area where the well lay. Local historian A N Palmer  saw the well in the early twentieth century, reporting that the building “though modern and unpretentious is very picturesque, still stood, although the well had by that time run dry, and eventually, at some point soon after both the well and the Misses Hayes structure vanished under earth extracted from the mine.
Photo – looking across the brook towards spoil heaps covering the old well site
The best records of memories of the well are included on the very informative website of the Broughton Local History Society  , which has been drawn upon for the preparation of this entry. They quote from the notes of Thomas Morgan (1878-1965), who lived all his life in the area.
“I have just written about the yew trees. They stood between the brook and the path, and looking from them across the meadow to the woods, you saw on the edge of the wood, a stone building about six feet wide and about four foot six inches wide, and this was Ffynnon Deuno. I often wondered what it was. There were few children who could speak Welsh and they always called the place ‘Farina Dina’”
“…the water of it was very soft, cold and sparkling and much resorted to by persons “with bad legs, and sore arms, or who were hurt in the coal mines.”
“The well was never or rarely dry in summer, but always in autumn and then for about two months, generally throughout September and October.”
A single yew tree remains today, between the brook and the path; but looking across towards where the well must have stood all one sees now is the steeply rising, now tree lined slopes of the last remnants of Gatewen colliery. The top of the heap is levelled off, and new housing estates are spreading across the old Gatewen farm lands.
 A N Palmer (1903) A History of the Thirteen Country Townships of the Old Parish of Wrexham