GLOSSARY. 157 



COURSE OF A LODE Its direction. 



CRADLE (Australia) A wooden apparatus for washing gold dirt. 



CRATER The cup-like cavity at the summit of a volcano. 



CREADERO (South America) Indication of gold. 



CREEK A small stream. 



CRETACEOUS Chalky. 



CREVICING Collecting gold in the crevices of rock. 



CROPPINGS Parts of the vein above the surface. 



CROSS-COURSES Veins which usually cross the main lode at right 



angles. 



CROSS-CUT A tunnel or level driven across the lode. 

 CRUCIBLES Fireproof vessels used in the roasting and melting ol 



ores, &c. 



CRYSTALLIZED Having well-defined crystals. 

 CUBICAL Of the shape of a cube. 

 CUT To intersect the lode, usually at right angles. 



D. 



DAMP A term applied to dangerous gas escaping from the mineral 



formation in a mine. 

 DEADS Ore that will not pay for working. Waste or rubbish in a 



mine. 



DEBRIS Disintegrated rock deposit. 

 DECANT To pour off liquid (from the sediment) out of one vessel to 



another. 



DECREPITATE To crackle and fly to pieces when heated. 

 DELTA The alluvial land at the mouth of a river : usually bounded 



by two branches of the river, so as to be of a more or less tri- 

 angular form. 



DENUDATION Rock laid bare by water or other agency. 

 DEOXIDATION The removal of oxygen. 

 DEPOSIT Matter laid or thrown down; for instance, mud or sand 



which, after suspension in water, has settled down. 

 DESICCATION The act of drying. 

 DEVELOPMENT Work done in opening up a mine. 

 DIAGONAL From one corner to another opposite. 

 DIALLING Surveying a mine by means of a dial. 

 DILUVIUM Drift deposit. 

 DIORITE Crystalline, whitish, speckled black, or greenish black. 



Chiefly consisting of felspar and hornblende, with often accessory 



minerals. 

 DIP The angle which the lode or bed makes with the horizon is called 



the dip. (See Chap. II.) 

 DISSEMINATED Scattered throughout a rock in tlie form of small 



fragments. 

 DISTILLATION The driving off vapours from a substance, and allowing 



them to condense on another surface or vessel. 

 DOLERITE A kind of basaltic rock. 

 DOLLY (Australia) An apparatus used in washing gold-bearing rocks, 



