I've not heard "evening Comes Early", though I have the other one. The "Blue Diamond Mines" that I'm familiar with was written by Jean Ritchie (kytrad on Mudcat, should you want to try to PM). She has recorded it on the LPs "A Time For Singing" and "Clear Waters Remembered". Most of "A Time..." found its way on to CD on the Rhino Handmade CD "Mountain Hearth & Home" and the Song served as the title tune to The Johnson Mountain Boys CD "Blue Diamond" on Rounder. The publishing rights are held by Geordie Music Publishing Co. Hope this all helps.