By Joe Dase (Up_miner) on Tuesday, October 17, 2006 - 12:08 pm:
Paul,
This postcard maybe mis-marked. This looks like Top Slicing to me, which was used in the Iron mines. Its not square sets that’s for sure, plus the openings is square, the development looks too vertical. Plus I maybe wrong on the top slicing but it doesn’t look like spiling or square sets. Plus the ground looks cruddy, maybe the men are caving the hanging wall in the Calumet and Hecla. C and H used to timber over mined out areas to protect the drifts from falling material as they were done scrapping, allowing the hanging wall to collapse onto the timbers, when from the level below to the exhausted level containing the protective timbering they would pull the timbers. The resulting collapse would de-stress the ground, and help prevent rock bursts. Just my speculations.
By Mary Drew at Pasty Central (Mdrew) on Thursday, April 2, 2020 - 11:37 am:
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