The shaft itself is a straight vertical drop of at least 180 feet down to some complex wooden cribbing. Near the bottom is a horizontal drift that was dug following the ore body. The complex cribbing at the bottom of the shaft may be the remnants of a trap door system that enabled the miners to dig and work much deeper, while protecting them from falling debris. Even a small rock falling 180 feet straight down a shaft can kill a miner. Timber cribbing was also installed in shafts when the miners would encounter soft rock in the walls. As you can see in the photo below, the upper rock is fairly strong and has seemed to stay solid for the last 100 years. This does not mean that this mine will stay open indefinitely, as mines such as this one may only stay open scores to hundreds of years.
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