172 Mining Terms. 
by leaching and other processes; usually these ores are 
low grades, free, or nearly so, from base metals. SHIP- 
PING OrE: Such as is better adapted to smelting than 
any local treatment. Any ore of greater value whem 
broken than the cost of freight and treatment. ReFRAc- 
vory Ores: An ore containing in quantities zine, ar- 
senic, antimony or other base metals, which prevent eco- 
nomical treatment by usual and available processes. W. 
J. Chamberlain & Co. 
Ore Reserves. The ore body where exposed ready 
for stoping. 
Ourcror. That portion of a vein appearing at the 
surface. ’ 
Ovutreut. The gross product of a mine. 
Pan. An iron basin used in gold prospecting. 
. PatcH. A small placer claim outside of the main 
gulch. 
Patio. A yard or court. The space where ore is 
mixed and amalgmated by tread of horses. Sp.. 
Patio Process. The Mexican method of amalga- 
mation of silver ores. 
Pay Rock. The lode material in which the min- 
eral or pay is found. See Quartz. 
Pay Streak. The ore body proper, or the seam of 
decomposed material which takes its place and preserves 
the continuity of the ore body. 
Pent Hovss. A’shed or horizontal barricade across 
one end of a shaft, made of strong timbers loaded with 
rock to protect against any accidental fall from above. 
Corn. 
PHONOLITE. A greyish, compact, felspathic rock 
yielding a metallic sound under the hammer; clink- 
stone. 
PincH. The narrow space where the walls come 
close together. 
Pir. A shallow shaft. 
Pircou. The dip of a lode. 
Piacer. A deposit of gold not in place; applied 
to all classes of gold deposit, including cement and 
