Mining Terms. 165 
Coaster. One who picks dump, or gleans in aban- 
doned mines for ore in sight. 
CopBine. Ore sorting. 
Conzar. The top of a shaft or winze. (2) The 
timbering of a shaft when carried above the surrounding 
surface. 
Cotor. A particle of gold in the pan. 
CoNCENTRATION. The removal by mechanical 
means of ore from the gangue or slime. 
Contact. The plane of meeting of two forma- 
tions. 
Contact VrerIn. A vein along the plane of contact 
of two dissimilar formations, consequently separating 
the two formations. Von Cotta. 
Correr. A metallic element; red; fusing point 
1996 deg. Fahr. Symbol Cu. Atomic weight 63.5. Spe- 
cific gravity 8.9. 
Cost-Book Company. A system of mining partner- 
ship local to Cornwall and Devon. 
Country Rock. The rock beyond the sides of a 
lode. The strata between or across which the lode is 
found. 
Coursrt oF VeIN. Its strike. The horizontal line 
on which it cuts the country rock. 
Coyrotine. Spasmodic, irregular surface mining. 
Crapte. A rocker. A short trough for washing 
gold. 
Crippinc. The timber lining of a drift, shaft, 
winze or mill-hole. The term is also applied to rough 
or light timbering as distinguished from solid set work. 
Cross ‘Course. An intersecting vein. 
Cross Cur. A level driven across the course of a 
vein. A short tunnel. 
Cur. To intersect a vein. Open Cur. A hori- 
zontal opening at the surface not reaching cover. 
5 CyanipE. A compound of cyanogen with a metal. 
The Cyanide Process of gold extraction is performed by 
passing an auriferous solution of potassium cyanide over 
zine shavings, by which the values are precipitated.— 
Henry Lewis on Gold Mining. Thos. R. Beaumont. 
