Arizona silver belt., 1900-01-11
COMMON MINING TERMS.
Information Concerning Mines and
 Mining Terms.

All work in mine is of two kinds development work and stoping. De- yel0pment work consists in making passage, through the ground for the purpose CD ascertaiuing the extent and value of known bodies of ore; l2) | for exploring unknown territories in order to discover new ore bodies; (3l for the purpose of facilitating or in- creasing the work of taking out the ore. These passages receive various names, such as d shaft, which is per pendicular opening; an incline, winch is one run on slope; tunnel, which is on the level. These three extend from the surface of the ground. With ia the mine and opening from those mentioned or from each other there are levels, cross cuts, upraiSeS and winzes, the latter being perpendlcu- lar opening cut from one level to meet another. All this development work may be done ln barren rock without any compeusating ore value, or the ore taken out may be of such great value as to pay all expenses and to Day a handsome proit besides. More often d considerable quantity of ores Is taken out which returns something to the miner, although it does not repay the entire cost of development.
 Any work towards taking out the ore more th;m is necessary for the pur- pose of development constitutes what IS called stoping. The chambers from which the Sre has been eXcaydCed are called the stopes, and these neceSSar- fly vary in size and character with the size and position Of the vein or ore body.
 Drifting is the act of following along with the course of the vein. Deiiui- tionS of othsr mining terms are as follows:
 Adit-Open cut or tunnel on the veIn.
 Alluyium Materials transported and deposited by water.
 Amalgam Gold or silver combined with mercury.
 Apex-The top or highest point of a yeln.
 Auriferous Any rock or sand bear ing gold.
 Bedrock Rock underlying placer mines.
 Blind lode Where there appears no outcr0p to vein.
 Breast-rhe face of a tunnel or drift.
 Breccia Angular rocks cemented together.
 Cage An elevator used in hoisting ore.
 Cap rock Rock oyerlying vein stone or ore.
 Collar The top of shaft or winze.
 Contact A junction of two kinds of rock, such as limestone and pOrphyry.
 Contact vein-A vein between two diSsimilar rock masses.
 Country rock-The rock on each side of vein.
 Cross cut-A level driven across the course of vein.
 Dip-The slope or pitch of a vein. Face-The end of a drift or tunnel. Fault-The displacement of stratum pr vein.
 Feeder-A small yein entering into . larger one.
 FisSure yein-A crack in the earth's l crust containing mineral.
 Foot wall-Rock beneath vein.
 Cash yein-A vein wide at the top | and closing at short depth.
 Hanging wall The layer of rock or wall overhanging lode.
 Horse-A mass of rock between the 1 branches of vein.
 In place Not having been disturbed | from it's original position.
 Leyel-A horizontal passage in q mine diyerting from the shalt.
 Outcrop The portion of vein show ing at the surface.
 Petering Giving out; failing.
 Pocket-A rich spot in a vein or de- poSit.
 Salting mine Placing foreign ore i In the creyiceS of ven for the puT- pose of deceiving.
 StrikeI The extension of a hole in a direction.
 Stalls A Framework to support the | rubbish when stoping.
 Stump A hole in the bottom of q shaft or tunnel for collecting the water.
 Vein-An aggregation of mineral | matter in rock iisSure.
 Seam and stringer are used inter- | for narrow branches run ming off from vein Oi lead.
 Lode A vein, thus lode claim, is a claim having in the boundaries vein. | This term is sometimes used to desig- nate tle claim itself.
 Volcanic Erupiions.
 Are grand, but skin eruptions rob |