David Kessler in Seattle learned Coal in the Snow from Dick Greenhouse and from Helen Schneyer's hard-to-find recording. David kindly recorded the tune and I've posted it at this link:

Helen Schneyer's tune for Coal in the Stone

David says: I learned Coal in the Stone from Dick Greenhaus in a late-night sing at Old Songs Festival years ago -- song circle in the Dutch Barn, and he brought that out around 1am I recall. just one of those songs you immediately know you're going to learn and I started absorbing it then and there. The next day I went to his CD table (he used to run Camsco, which seemed to specialized in hard to find trad music recordings) and asked him to teach it to me. He sang it once more for me that weekend and said he only knew of 1 recording of it. He was out of it, but he'd look around - the next day he sold me his personal copy of the CD -- Helen Schneyer's 'What A Singing There Will Be'."