Hi,
Gill & Company, Plymouth was bought by the Tavistock Iron Works, then by Finch Foundry, in Devon, who all made mining implements.
These were 'sandwiches' of mild steel welded onto a core of hard steel to maintain the cutting edge. Finch Foundry is now a National Trust site, and offers catalogues of the vast range of agricultural and mining tools made.....
Prehistoric men dug flints with antlers...The Pyramids were built with stone tools, (later copper). Roman Ploughs were wooden, with iron tips. Iron tools were already well developed at the beginning of the Iron Age, and changed little until the industrial revolution arrived.
Excavating hard rock demanded great skill and dexterity before explosives arrived. And tooling was all-important...
D.Send.