Thanks to Annette Blaylock


M and W Mining, 1942
From the 1947 Mining Directory:


Operated by the M. & W. Mining Co., Inc. Box 326, Baxter Springs, Kansas. D. L. Mundon, President; W. R. Welty, Secretary; both acting as Purchasing Agent and Superinstendent. Located 2 1-2 miles east of Picher, Oklahoma. Has 1 mine shaft. Rock is milled over mill northwest of Baxter Springs, Kansas. Has been in operation 25 years. See M. & W. Mining Company, Inc.


The above also explains the "Huttig 3" on the little sign at the right.
So many of these miners of yesteryear look terribly familiar.  I can't believe nobody recognizes any of them.
Send me your best guess, and I'll post it.  Otherwise, we'll never get any names on these people.