My Great Uncle Robert Lafayette Williams was supposedly killed in a mining accident in OK in 1905. I would assume, as he was only 18 or 19 that he would have been in either Latimer, Pittsburg or LeFlore Co., OK., as his brothers and sisters lived in those Counties. Family names Graddy, Sevier, Mankins, Padgett.
Robert's brother Daniel Lewis Williams died in a mining accident. His death date is June 21, 1921. He apparently died at Howe, LeFlore Co., and/or is buried there.
His name is listed on a tribute to mining deaths at McAlester, Pittsburg, OK.