Mining Terms. 171, 
plates. Found in the lode, as well as in the matrix of 
the lode. 
‘ Mitt Hote. A passage left in the stope for throw- 
ing down rock and ore. 
Mitt-Run. The returns of a lot of ore; the assay 
of ore in quantity as distinguished from a specimen 
assay. . 
) Minx. Any excavation made for mineral which 
ean be profitably operated. (2) An open as distin- 
guished from an untouched deposit. (3) Underground 
as distinguished from superficial workings or quarries. 
| Miner’s Incu. There is an attempted statutory 
definition in Colorado M. A. 8. Sec. 4643 which is ob- 
scure and inexact. See also 2467. Orifices constructed 
as this statute directs, will deliver through each square 
inch of opening, a quantity which varies from 1.4 to 1.7 
cubic feet of water per minute. The custom among en- 
gineers is to take 1.5 cubic feet of water per minute as 
the equivalent of an inch. For Illustration: 1,000 
miner’s inches of water (25 cubic feet per second) is 
about the quantity which would be carried by an ordi- 
nary wooden flume 30 inches wide, flowing 18 inches 
deep, if the flume had a fall of one inch per box of 12 
feet (36 feet per mile), this giving the stream a veloc- 
ity of 6.7 feet per second. Hdmund B. Kirby. 
Miner’s Rigut. ‘The license to locate, used in 
Australia. 
Moyte. A drill or short bar sharpened to a point, 
used in cutting hitches and in broaching. 
Nopuue. A small, rounded, stony concretion. 
Open Cur. A longitudinal surface working not 
entering cover. 
OprRATOR. One who works a mine either as owner 
or lessee. 
Orr. The mechanical or chemical compounds of 
the metals with baser substances. The conventional di- 
visions in the ore market are: Dry Ore: An ore which 
does not contain any lead, or less than 5 per cent. ; MrLL- 
tncé Ore: A dry ore that can be amalgamated or treated 
