Survey Term "breast" of mine??

[jeb49]

I was reading through some old survey notes, from 1906, of one of my mining claims near Silverton Colorado.
The survey states the following:
A drift 5 x 7.5ft. in size, the entrance
to which bears S. 66°10’ E 190 ft. from
Cor. No. 1 and runs S 49° 10’ E 45 ft:
thence S. 22° 37” E 60 ft to the breast.

Is any one familar with what this referes to?? I would assume the end of the drift?

[ExpUt]

Dictionary.com to the rescue.

"Mining. the face or heading at which the work is going on. "

[rhartill]

Survey term "breast" of a mine

Breast also signifies that it is a horizontal as opposed to a downward inclining drift.

Breast stoping means moving a drift in a horizontal direction while underhand stoping refers to a downward dipping drift.

It (breast) almost always refers to the face of a mine (the place where the vein is being worked, usually the "end" of a drift or room)

Other terms which might be confusing include the BACK of a mine, which is the roof. "Scaling the Back" means to scrape loose roof pieces with a long piece of drill steel. Also, when you encounter a vein, the rock above it is called the HANGING wall, and the rock below it is called the FOOT wall.

BTW, Found this neat paper on interpreting mine maps here:

http://www.azdot.gov/Highways/Materials/Geotech_Design/Seminar/PDF/MineMap_Interpretation.pdf

[jeb49]

Thank you - just the info I needed. Very informative link.

My next task will be to determine the location of USMM Artois. I've determined it is about located at +/- 1/4 mile of N37.86330 W107.54686 WGS84.