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Larkspur Mine - lower adit incline shaft

At a junction in Nevada's Larkspur Mine, a long defunct silver mine from the late 1800s that has multiple adits, however there are two main ones that have significant workings, of which include a multitude of stopes, ore chutes, raises, & winzes, not to mention a few false floors as well that could be fatal.  Here during the main passage w/ the ore cart tracks is a downward incline shaft (could also be a winze leading down into a stope) w/ rails still left behind, opposite of that is a seat where the hoist operator likely would've sat, unless that cushion was brought in more recently.  Another false floor covered with floor boards lies nearby.  Down the incline one can see extensive workings of a stope, a diagonal silver vein the miners were following.


A few mining terms:


Adit - A horizontal passage leading into the mine, not to be confused w/ a "tunnel", which would have an opening out the other side.  Adits are sloped slightly upwards to allow for drainage of groundwater.


Crosscut - A horizontal opening that does not run along the vein. Typically a shaft will lead to crosscuts at each level that give access to drifts along the vein. Crosscuts typically run straight as an arrow through worthless rock.


Drift - A horizontal opening that runs along the vein. Typically there are many ore chutes from stopes above, and the drift will wander to follow the vein.


Level - If you follow a ladder down a shaft, you will arrive at horizontal workings every 100 feet or so, and these are called levels. The levels have a station near the shaft, and are named by the distance down the shaft.


Manway - Any kind of passage with a ladder in it could be called a manway. Shafts are divided into "compartments" and one of these is very often a manway. Sometimes the manway of a shaft is crowded with pipes and cables and such.


Ore chute - A "spout" built of wood used to load broken rock from above into waiting ore bins.


Raise - A raise is like a shaft that starts undergound and goes upwards. Typically a ladder next to an ore chute along a drift goes up a raise and gives access to a stope above.


Square set stoping (timbering) - The most expensive mode of underground mining. As ore is removed in a stope, it is replaced by a 10x10 foot lattice of 12x12 timbers. The ground was unstable here & the lattice helps protect from potential collapses. Many times the sets are backfilled with broken rock to help support the stope.


Stope - An excavation underground that actually removed whatever it was they were after. These are typically irregular in shape as they follow the ore whereever it goes. If the vein is wide and/or the rock is poor, the challenge in mining is to keep the rock supported while extracting the material in the stope.


Winze - A winze is like a vertical or inclined shaft that starts underground & connects one level down to another.



Source: Mining Terms:

Copyright: William L
Type: Spherical
Resolution: 20756x10378
Taken: 09/12/2017
Uploaded: 22/12/2017


Tags: larkspur mine; nevada; winze; raise; ore cart tracks; silver mine; adit; drift; tunnel; hoist operator; incline shaft; stope
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