A surprisingly jaunty melody, for a tune named after the 19th century Ozark Mountains foundry that produced iron for American Civil War canonballs.
Before teaching a fascinating fiddle masterclass, legendary Missouri musician and steamboat pilot John Hartford regales us with tales of Missouri fiddler Roy Wooliver (1896-1964), with whom the tune is identified.
Want to cut straight to the tune? John begins playing at 2.40.
John Hartford (fiddle)
Standard tuning GDAE; key of D.
(‘John Hartford Old Time Fiddle Lesson: Hamilton Ironworks’, YouTube video 7.43. Published by VaporBatVideos, Jul 4 2017. https://www.youtube.com/watch?v=gds8UIP95fo)
Roy Wooliver (fiddle) 
Enjoy Roy Wooliver playing Hamilton Ironworks at Larry Warren’s amazing Slippery Hill website here. (Field recording by John Hartford.)
John Hartford (1937-2001): website
Jenny Glover's FIDDLETAILS 