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Title Description
 Bedded Rock   

One of the two subdivisions of competent rock. To be classed as bedded rock, the rock within each bed, in addition to being elastically perfect, isotropic, and homogeneous, must have a bed thickness that is small compared with the roof span, and the bond between beds must be weak. Most sedimentary rocks and some stratified metamorphic rocks fall in this group.  
 Bulk Mining   
A method of mining in which large quantities of low-grade ore are mined without attempt to segregate the high-grade portions. 
 Babel Quartz   
A variety of quartz, named for the fancied resemblance of the crystal to the successive tiers of the Tower of Babel. Syn: Babylonian quartz 
 Bathymetric   
A. Relating to the measurement of depths of water in oceans, seas, and lakes. Syn: bathymetrical
B. Relating to the contour of the bottoms of oceans, seas, and lakes. Webster 3rd
C. Relating to the distribution in depth of marine or lacustrine organisms.  
 Bulk Density   
A. The weight of an object or material divided by its volume, including the volume of its pore spaces; specif. the weight per unit volume of a soil mass that has been oven-dried to a constant weight at 105 degrees C. CF: apparent density
B. The ratio of the weight of a collection of discrete particles to the volume that it occupies. BS, 5
C. The weight of a material, on being compacted in a defined way, per unit volume (including voids). Taylor
D. The weight per unit volume of any material, including water; the weight in pounds per cubic foot (kg/m3 ). 
 Broken Ground   
A.A shattered rock formation or a formation crisscrossed with numerous, closely spaced, uncemented joints and cracks. CF: loose ground; breccia. Long
B. Rock or mineral formations fragmented by blasting with explosives, such as the broken material in a shrinkage stope. 
 Byssolite   
An olive-green asbestiform variety of tremolite-actinolite. The term is used in the gem trade for a variety of quartz-containing, greenish, fibrous inclusions of actinolite or asbestos.  
 Bathyal Zone   
In oceanography, the slope from the continental shelf at 100 fathoms (183 m) to the abyssal zone at 1,000 fathoms (1,830 m). Also called bathyal district. 
 Bull Mica   
Large clusters of diversely oriented and partially intergrown crystals of muscovite with a little interstitial albite and quartz.  
 Banded Ore   
Ore composed of bands as layers that may be composed of the same minerals differing in color, textures, or proportions, or they may be composed of different minerals.  
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