Which preposition to use with smelters

at Occurrences 2%

It began around the Bully Boy and Theresa group of mines midway up Squaw Gulch, spreading down to the smelter at the mouth of the ravine.

in Occurrences 2%

"I built that big pipe line in Portland; I sold those smelters in Anaconda, and the cyanide tanks for the Highland Girl.

of Occurrences 2%

I now worked awhile again with Mr. Henry and we sold our wood to Bill Park, a collier, who made and sold charcoal to the smelters of lead ore.

to Occurrences 1%

"T' Maister's too strong for him," said a smelter to his neighbour.

Which preposition to use with  smelters