My friend accurately recalled where the furnace he remembered was and we got there without incident.
Its the Southfield Furnace.
The Southfield Furnace Ruin in Southfields, New York, was a longtime smelting site for iron ore mined from nearby veins in what is now Sterling Forest State Park. It is located on the north side of Orange County Route 19, 0.7 miles northwest of the junction with New York State Route 17.
It was added to the National Register of Historic Places on November 2, 1973 for its significance in industry.
It was built by Peter Townsend II, who also owned the mines. The Southfield Ironworks in addition to the furnace included a stamping mill, grist mill, saw mill, smith shop, wheel wright shop, coal shed, store, and stables.
The furnace was shut down in September 1887. (Wikipedia).
My friend had said that this furnace was not as interesting as the one in Sterling Forest, but I rather liked it – maybe because, unlike the Sterling Furnace you can still see the Charging Bridge on the left, which was used for bringing ore, charcoal and limestone to the top of the furnace.
Unfortunately there was no parking on the road and there was a stream between the road and the furnace. So I was unable to wander around and was only able to get the one picture.
Taken with a Fuji X-E3 and Fuji XC 16-50mm f3.5-5.6 OSS II