A glossary of mining and metallurgical terms

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26 A GLOSSARY OF MIXING AND METALLURGICAL TERMS. Cocered-binding , Corn. See P/ank-timberinf/. Coio. A kind of self-acting brake for inclined planes; a trailer. Coiol. See Water-barrel. Coicper-Siemens stove. A hot-blast stove of firebrick on the regenerative-principle. Coyoting, Pac. Mining in irregular openings or burrows, com- parable to the holes of coyotes or prairie foxes. Crab. A machine for moving heavy weights. Specially the en- gines employed for lowering into place the pumps, rods, pipes, etc., of Cornish pit-icork. Cradle, Pac. See Rocker. Cramp. A pillar of rock or mineral left for support. Cranch. Part of a vein left by old workers. Craze or Creaze, Corn. The tin-ore which collects m the middle part of the huddle. Creep, Newc. A rising of the floor of a gangway, occasioned by the weight of incumbent strata, in pillar workings. Also any slow movement of mining ground. Cretaceous. 1. Chalky. 2. See Geologicalformations. Crevet. A crucible. Crevice, Pac. 1. A shallow fissure in the bed-rock under a gold placer, in which small but highly concentrated deposits of gold are found. 2. The fissure containing a vein. Crib. 1. See Curb. 2. A structure composed of frames of timber laid horizontally upon one another, or of timbers built up as in the walls of a log-cabin. 3. A miner's luncheon. Cribbing. Close timbering, as the lining of a shaft, or the con- struction of cribs of timber or timber and earth or rock, to support a roof. Cribble. A sieve. Crop. 1. Corn. See Crop-tin. 2. The basset or outcrop of strata at the surface. 3. To leave coal at the bottom of a bed. Cropping out. The rising of layers of rock to the surface. That part of a vein which appears above the surface is called the cropping or outcrop. Crop-tin. The chief portion of tin-ore separated from waste in the principal dressing operation. Cross-cou7'se, Corn. An intersecting (usually a barren) vein. Cross-cut. A level driven across the course of a vein, or, in gen- eral, across the direction of the main workings (as to connect two parallel gangNA'ays), or across the " grain of coal."
A GLOSSARY OF MINING AND METALLURGICAL TERMS. 27 Cross-heading. A heading driven across from one gangway or breast to another, nsually for ventihition. Cross-vein. An intersecting vein. Croiv or crow-foot. A tool with a side-claw, for grasping and re- covering broken rods in deep bore-holes. Crucible. 1. A melting pot. 2. The lower part of a shaft furnace, in which fusion is effected and the molten bath is contained. Crush. 1. A squeeze, accompanied, perhaps, with more violent motion and effects. 2. A variety of fault in coal. See Fault (2). Crusher. A machine for crushing ores. Cry of tin. The peculiar crackling noise produced in bending a piece of metallic tin. Culm. 1. Eng. Anthracite. 2. Penn. The waste or slack of the Pennsylvania anthracite mines, consisting of fine coal, more or less pure, and coal-dust and dirt. Cup-and-cone. A machine for charging a shaft-furnace, consisting of an iron hopper with a large central opening, which is closed by a cone or bell, pulled up into it from below. In the annular space around this cone, the ore, fuel, etc., are placed ; then the cone is lowered to drop the materials into the furnace; after which it is again raised to close the hole. Cupellation. The treatment on a hearth or cupel (usually formed of bone-ash) of an alloy of lead, gold, and silver, by means of fusion and an air blast, which oxidizes the lead to litharge, and removes it in liquid form, or absorbs it in the cupel. Cupola. A shaft-furnace with a blast, for remelting metals, pre- paratory to casting. Sometimes incorrectly pronounced and written Cupalo. Curb. A timber frame, circular or square, wedged in a shaft to make a foundation for walling or tubbing, or to support, with or without other timbering, the walls of the shaft. Curbing. See Cribbing. Cut. 1, To intersect a vein or working. 2. To excavate coal. Dam. 1. To keep back water in a stream or mine by means of a dam or bulkhead. 2. S. Staff. See Stopping and Bulkhead. 3. The wall of refractory material, forming the front of the fore-hearth of a blast furnace. It is built on the inside of a supporting iron plate (dam-plate). Iron is tapped through a hole in the dam, and cinder through a notch in the top of the dam. See Liirmana front.
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A glossary of mining and metallurgical terms

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