a. Portable drilling equipment, usually mounted on four wheels and driven
by steam-, diesel-, electric-, or gasoline-powered engines or motors. The
drilling is performed by a heavy string of tools tipped with a blunt-edge
chisel bit suspended from a flexible manila or steel cable, to which a
reciprocating motion is imparted by its suspension from an oscillating
beam or sheave, causing the bit to be raised and dropped, thus striking
successive blows by means of which the rock is chipped and pulverized and
the borehole deepened; also, the act or process of drilling a hole with a
churn drill. Also called American system drill; blasthole drill; cable
drill; cable-system drill; churn-drill rig; rope-system drill; shothole
drill; spudder; spud drill; wet drill. See also:percussion drill
Syn:cable-tool drill
b. A long iron bar with a cutting end of steel, used in quarrying, and
worked by raising and letting it fall. When worked by blows of a hammer or
sledge, it is called a jumper or jump drill.
In mining and in the quarry industry, one who drills holes with a churn
(cable) drill in rock and overlying ground of open-pit mines or quarries
to obtain samples, or to provide holes in which explosives are detonated
to break up a solid mass. Syn:blasthole driller;
blasting hole well driller. DOT
See:churn drill
A boring rig that combines both churn and shot drillings. The churn drill
is used for rapid penetration in barren ground where no core is required.
The shot drill is used for taking cores along important rock formations.
Nelson
a. A channel or shaft underground, or an inclined trough aboveground,
through which ore falls or is shot by gravity from a higher to a lower
level. Also spelled shoot.
b. A crosscut connecting a gangway with a heading.
c. A ditch or inclined timber through which the overflow water or mud from
a borehole is conducted from the collar of the hole to the sump. The chute
may be fitted with baffles and screens to cause the cuttings to settle
before reaching the sump. Syn:canal; ditch. Long
d. A body of ore, usually of elongated form, extending downward within a
vein (ore shoot). See also:chimney; shoot.
e. A trough operated mechanically in loading coal underground.
Syn:rock chute
f. A string of rich ore in a lode (used instead of shoot). Nelson
g. Stockpile withdrawing system, such as a belt conveyor. Pryor, 3
h. A metal trough in a breaker, along which the coal slides by gravity.
Hudson
i. A steep, three-sided steel tray for the passage of coal or ore from a
conveyor into mine cars. It is designed to minimize degradation and
spillage of materials. See also:loading chute
j. Ore pass connecting a stope with the haulage level. Pryor, 3
k. A high-velocity conduit for conveying to a lower level.
Syn:course of ore
In coal mining, a foreperson who supervises the loading and drawing of
coal into and out of chutes, esp. where coal is mined from inclined beds.
DOT
The method involves both overhand stoping and ore caving. A chamber is
started as an overhand stope from the head of a chute and is extended up
until the back weakens sufficiently to cave. The orebody is worked from
the top down in thick slices, each slice being, however, attacked from the
bottom and the working extending from the floor of the slice up to an
intermediate point. The cover follows down upon the caved ore. Also called
caving by raising; block caving into chutes.
In metal mining, one who keeps a record of the amount of ore drawn from
each raise or chute in an orebody being mined by the caving method (lower
part of orebody is mined and developed with a system of chutes so that the
remaining ore that sloughs, or caves, from lack of support can be drawn
off). Also called tallyman. DOT
See:chute loader
a. In metal and nonmetal mining, a laborer who loads ore or rock into mine
cars underground by opening and closing chute gates. Also called chute
drawer; chute man; chute puller; chute trammer; chute tapper. DOT
b. In the quarry industry, one who loads crushed rock from bins into
trucks or railroad cars by opening and closing the chute or bin gates by
hand or by means of a lever. Also called car loader. DOT
In the quarry industry, a laborer who loads barges with crushed rock by
operating a hand winch to lower a chute through which crushed rock flows
from a bin. DOT
A method of mining by which ore is broken from the surface downward into
chutes and removed through passageways below.
See also:glory-hole system
See:chute loader
A marshy area where the ground is wet because of the presence of seepage
or springs, often with standing water and abundant vegetation. The term is
commonly applied in arid regions such as the Southwestern United States.
Etymol: Spanish cienaga, marsh, bog, miry place. AGI
A slow-setting, rapid-hardening cement containing 40% lime, 40% alumina,
10% silica, and 10% impurities; used in cementing drill holes. Sometimes
called bauxite cement.
A white, grayish, or reddish hydrosilicate of aluminum; soft and claylike
or chalklike in appearance. Fay
a. A loose volcanic fragment that may range from 4 to 32 mm in diameter.
Such fragments are usually glassy or vesicular. Stokes
b. A small (1- to 4-cm), commonly vesicular, fragment of lava projected
from an erupting volcano; coarser than volcanic ash but smaller than a
volcanic bomb.
c. A juvenile vitric pyroclastic fragment that falls to the ground in an
essentially solid condition.
d. Slag, particularly from an iron blast furnace.
e. A scale thrown off in forging metal. CF:lapilli
A block closing the front of a blast furnace and containing the cinder
notch. Webster 3rd
The slag within a furnace escaping through the brickwork; caused by
erosion, corrosion, or softening of brick by heat. Fay
a. Coal that has been cindered by heat from an igneous intrusion. Many
coal seams have been affected in this way in Scotland and in Durham,
England. See also:metamorphism
b. Aust. A very inferior natural coke, little better than ash.
See also:natural coke
In a blast furnace, a watercooled casting, usually of copper, that is
pressed into the cinder notch. Henderson