Kris, I can tell you that one of the mines in Sebastian Co was the " Jennie Lind", but there many mines in the area. Many were small operations, but in Midland AR only a short distance from Hackett for example, population at its height was several thousand and included several banks and hotels and even had its own telephone exchange. After the mines were worked out, the people followed wherever the next mine was hiring and today Midland is a sleepy little town with a population of about 275-300. I was born there in 1930 and my family was one of those which chose to migrate West and I was consequently raised in CA. Hope this helps with your question re "mines". Hal in FL