170 Mining Terms. 
Laaaine. Poles or small timbers used for span- 
ning from one stull-piece to another, for cribbing mill- 
holes and for lining behind the timbers of a shaft. 
Leap. An objectionable form of the word lode. 
Leap. A metallic element; bluish-white; fusing 
point, 617 deg. Fahr. Symbol, Pb. Atomic weight, 
207. Specific gravity 11.30. Galena and carbonates 
are its most common ores. 
Leper. A term in use on the Pacific Slope, syn- 
onymous with lode. 
LenetH. A certain portion of a vein when taken 
on a horizontal line on its course. 
Lever. A drift along the vein; the word generally 
used where there are a series of drifts, as first level, 
second level, etc. 
Lirt. The space between two levels. 
‘ Lirrtz Grant. A jointed iron pipe and nozzle de- 
creasing in diameter with the increase of the hydraulic 
pressure; used in placer mining. 
Location. Those successive acts by which a claim 
is appropriated. (2) The claim itself. Amer. 
Lopr. An aggregation of mineral matter contain- 
ing ores in fissures. Von Cotta. A vein of metallic 
ore. A ledge. A fault in the country which has be- 
come mineralized. A. H. Green. 
Man Hotz. An opening just large enough to 
permit access between two workings. 
Matrix. (Of the lode.) The country rock in 
which the vein is found. (Of the ore.) The rock or 
earthy material enclosing the ore; the vein-stone. Latin. 
Mercury. Quicksilver. A shining silver-white met- 
al, liquid at temperatures above —40 deg. Fahr. Sp. 
gr., 13.5. At. wt. 199.7%. Boils at 669 deg. Fahr. 
Symbol, Hg. 
Meratuurey. The art of working metals, includ- 
ing smelting, refining, and parting them from the ores. 
Mica. One of the constituents of granite. When 
separately crystallized is found in clear, laminated 
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