166 Mining Terms. 
Drap Ricuss. Base bullion. 
Dead Work. The developing of a mine preparatory 
_ to stoping. = - 
Desris. The loose fragments detached from the 
bed rock and washed down, to which the term slide is 
more appropriate; waste rock of any kind. French. 
Derp. The lower portion of a vein. 
DENOUNCEMENT. The Mexican or Spanish equiv- 
alent to “location and record” of a claim. 
Descension THEORY. The theory that veins were 
filled from above. 
Dieaines. Placers. Amer. 
Dike, or Dyker. A fissure made and filled by plu- 
tonic action. Its rock is most commonly porphyry. It 
is often barren, but in some cases mineralized; or may 
carry a mineralized selvage and so appear as the wall 
of a lode. 
Dituvium. A deposit of loose boulders, earth, ete., 
attributed, geologically, to deposition from water. . 
Die. The line of declination of strata—Bain- 
‘bridge. Yale—The angle which a lode makes with the 
plane of the horizon. Von Cotta—The departure of a 
vein from the perpendicular or from the horizontal. 
Ditcu. An artificial watercourse, flume or canal, 
with or without natural channels. 
Divintne Rop. A stick of witch-hazel or other — 
like device used in prospecting for lodes. Law v. Grant, 
7 M. R., 57%. 
Doriar. From the German Thaler. 100 cents. 
Gop. 23.22 grains, alloy 2.58 grains, weight 25.8 
grains; coined 1849—1902. Sitver. 37114 grains, al- 
loy 4114 grains, weight 41214 grains; coined 1794— 
i804, 1836—1838, 1840—1873, 1878—1902. Legal ten- 
der unlimited. The Mexican dollar contains 377.17 
grains silver and 40.62 grains alloy. Spanish dollar 
the same. FH. O. Leech, Director U. 8S. Mint. 
Drirrt. An underground passage driven horizon- 
tally on, or with, the vein. 
