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Larkspur Mine - upper adit stope ascent

A view partway (about 20 feet from main level) following a raise up a large diagonal stope 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.  This was a back-aching panorama to take, the stope is angled so I had to stand at an angle & balance myself around old crickety rungs of the ladder that could've easily given way.  Top to bottom at an angle the stope is only about four feet across.  When I finished one half of my panorama, I had to carefully maneuver 180 degrees past my tripod to get the other half of the panorama.  The ladders look very unstable but surprisingly they hardly moved, though I didn't risk climbing any higher even though I was curious just how high this large excavation went.  Here you can step back in time to a style of mining that no longer exists but is a classic style of Nevada underground mining.  The wood beams nearby are parallel to the direction of the stope, part of a large ore chute.  There are also many single wood beams held up in support against the overhanging ceiling to reduce the risk of unexpected collapse, to which everything is still holding up well after many decades.  Eventually all of this will crumble, so that is why I am here now to document what I can before it's gone.


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
Art: Spherical
Resolution: 13200x6600
Taken: 09/12/2017
Hochgeladen: 01/01/2018


Tags: larkspur mine; nevada; ladder; silver mine; adit; drift; manway; winze; tunnel; raise; stope; ore chute
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