a. Mex. Cloth used by miners.
b. Sp. Place where minerals are concentrated. The patio floor is one on
which silver and/or gold ore is amalgamated. See also:patio process;
arrastre. Pryor, 3
The patio process, dating back to the 16th century, was a crude chemical
method for the recovery of silver by amalgamation in low heaps with the
aid of salt and copper sulfate (magistral). See also:patio
Liddell
A monoclinic mineral, VS4 (?) ; synthetic VS4 is soft,
gray-black, fine-grained; impure material constitutes an important ore
mineral in the vanadium deposit at Minasragra, Peru.
a. As applied to diamond bits, the design formed by spacing and
distributing the diamonds in conformance with a predetermined geometric
arrangement on the crown of a bit. See also:concentric pattern;
eccentric pattern. Long
b. The system followed in spacing boreholes. See also:checkerboarded;
pattern shooting. Long
One who makes sand molds for castings; a molder. Standard, 2
In seismic prospecting, the use of a number of energy sources arranged in
a definite geometric pattern. AGI
An agitator of the Pachuca-tank type in which air is replaced by a
solution or water, under pressure from a centrifugal pump.
See also:Pachuca tank
A process for separating silver from lead in which the molten lead is
slowly cooled, so that crystals poorer in silver solifidy out and are
removed, leaving the melt richer in silver. ASM, 1
A series of pots for separating silver and lead by making use of the fact
that the melting point of their alloys rises as the percentage of silver
increases. Standard, 2
This instrument measures barometric pressure and is quite accurate for a
portable instrument. It can be used for finding the difference in pressure
between points at various elevations without checking the setting of the
pointer, or it can be checked against a mercury barometer and then used as
a portable barometer. It is useful in making a survey of the drop in
ventilation pressure throughout a mine.
An isometric mineral, (K2 ,Ca,Na2 ,Ba)5 [Al10
Si32 O84 ].34-44H2 O ; zeolite group; forms rhombic
dodecahedra; at the Columbia River Rock Island Dam, Wenatchee, WA.
Generalizations about coordination polyhedra and the ways they fit
together in stable ionic crystal structures: (1) A coordination polyhedron
of anions forms about each cation. (2) Electronic neutrality is maintained
over short atomic distances. (3) Coordination polyhedra tend not to share
edges or faces. (4) Highly charged cations minimize sharing of polyhedral
elements.
a. A layer immediately underlying coal or any other workable material.
Arkell
b. The floor of a mine.
c. Any construction superimposed on a subgrade to reduce loading stresses
and to protect it against the abrasive effects of traffic and weather.
Nelson
d. See:base rock
e. A bare rock surface that suggests a paved road in smoothness, hardness,
horizontally, surface extent, or close packing of its units; e.g., boulder
pavement, glacial pavement, desert pavement, limestone pavement, erosion
pavement. AGI
Any of the undersides and corners of a brilliant-cut gem; they lie between
the girdle and the collet. Hess
An air hammer that does not rotate its steel. Nichols, 1
A type of commercial sand with applications divided into three general
classes: concrete pavements, asphaltic pavements, and grouting.
A monoclinic mineral, (Ag,Cu)(Bi,Pb)3 S5 ; at the Porvenir
Mine, Bolivia. The synthetic phase, AgBi3 S5 , has the same
X-ray pattern.
A tooth or set of teeth designed to lock against a ratchet.
Nichols, 1
A monoclinic mineral, CuAs2 ; pseudo-orthorhombic; forms
intergrowths with novakite, koutekite, and arsenic; in Bohemia, Czech
Republic.
_E Ïb[ ôd[ j4> ½ DICTIONARY TERMS:pay a. That portion of a formation, deposit, prospe
[\B]pay[\N]
a. Gravel. Of alluvial deposits, sand rich enough to be excavated and
treated to recover its valuable contents. See also:pay streak
Pryor, 3
b. S. Afr. The same as payable ore, but in an alluvial deposit. Also
called pay rock. See also:pay ore
c. Earth, rock, etc., that yields a profit to a miner. Webster 3rd
A layer or deposit of soil or rock whose value is sufficient to justify
excavation. Nichols, 1