In the San Francisco Chronicle:1940
It will be literally a de profundis (out of the depths) tonight at 6 o'clock when the 50 voices of the Cornish Gold Mining Singers and Grass Valley Carol Choir rise in Christmas carols from the 2400-foot level of one of California's deepest and richest mines-the Idaho-Maryland....Artificial sound effects will be unnecessary. In the background will be heard the drum of drills and whine of the pumps as the carolers blend their voices in traditional Christmas music that has been handed down in manuscript from generation to generation for centuries but never published.
On Christmas Eve the boys and men, ages 10 to 71, met at the Methodist Church and traveled to the mine together.
"From When Miners Sang" by( Gage McKinney)
