jalind
Well-known member
A very interesting and informative post. I have no intention of ever even entering a mine but that was fascinating stuff.
However I've read it a couple of times and I don't understand the use of the word "thumb"--unless it was a bit of humor?
Maybe I'm slow this AM.

Every hammer, and any other tool used in that manner, is a thumb detector and locator. User emits loud expletives of joy every time that function succeeds, sometimes in a foreign language. My father used German.
Edit:
Hard rock mineral mines, if owned and operated by a good mining company, are generally very safe considering the enormous pieces of industrial equipment you're working around, sometimes in close quarters. Fire damp (methane) is highly unusual in the hard rock mining I'm familiar with, unlike the hazard of it in coal mines. Most of these mines have very little shoring. The drifts, crosscuts, and ramps (inclined tunnel) are mostly giant holes bored through solid rock. A main drift is usually 10' x 10', arched at the top. When drifting, the first thing after ensuring there are no bootlegs, is "baring down" in which a miner goes in with a very long digging bar and pries vigorously at anything that looks like it might be a loose "slab" (large piece of rock, aka a boulder) to bring it down. There's a technique to doing this without getting hurt. If there's one that cannot be brought down, but still appears to have fissures a driller will come in, stope one or more holes through it and put massive rock bolts in with mondo fender washers and an equally mondo nut on it. The rock bolts are extremely long. Seeing those wasn't all that unusual. Anywhere it got loose, full shoring would be used and the end result would be more like a tunnel people are accustomed to driving through, albeit not finished off to look nice. They are, however, generally harsh environments, the work is hard labor and you get quite grimy by the end of a shift, which is why there's a "mine dry", the equivalent of a locker room, to shower and change clothes in before going home. The clothing worn underground are called "diggers" and I bought all of mine at the nearest Goodwill and Salvation Army stores. Old shirts and heavy pants. You don't wear anything underground that you wouldn't be willing to burn after it's worn thin. Buying any new shirts or pants is pointless.
Two kinds of mine you'd never, ever get me past the collar (entrance): coal for obvious reasons and uranium which typically have a Radon gas and Radon daughters hazard.
John
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