Miner's term for part of a fossil tree trunk, such as Lepidodendron or
Sigillaria, with a leaf-scar pattern suggesting scales.
See:dragman
Crushed and broken fragments of rock or ore torn from an orebody and
contained in and along a fault zone. See also:trail of a fault
Syn:drag
Misplacement of relatively fine material due to its adherence to a coarser
fraction being settled and dragged out in mechanical classification or
heavy-media separation. Pryor, 3
See:negative rake
Steel bars with a hook at one end and prongs at the other, which are
inserted in the drawbar at the rear of the tub ascending an incline so as
to prevent it running back. Mason
a. A digging and transporting device consisting of a bottomless bucket
working between a mast and an anchor. Nichols, 1
b. A towed bottomless scraper used for land leveling. Called leveling drag
scraper to distinguish from cable type. Nichols, 1
A shovel equipped with a jack boom, a live boom, a hinged stick, and a
rigidly attached bucket, that digs by pulling toward itself. Also called
hoe; backhoe; pullshovel. Nichols, 1
A pole projecting backward and downward from a vehicle, to prevent it from
running backward. See also:backstay; drag. Fay
A mill in which ores are ground by means of a heavy stone dragged around
on a circular or annular stone bed. See also:arrastre
Webster 3rd
See:dredging sump
A conduit or open ditch for carrying off surplus ground or surface water.
Closed drains are usually buried. Seelye, 1
The manner of gravity flow of water or the process of channelization, for
removal at a point remote from a mining operation.
See also:drain tunnel; water hoist. Nelson
a. The area from which water is carried off by a drainage system; a
watershed or a catchment area. Seelye, 1
b. See:basin
a. The furthest or highest spot in a drainage area. Nichols, 1
b. Difference in elevation between two points in an area to be drained.
See:water level
A channel cut alongside a mine roadway to provide for drainage and enable
the proper ballasting of the rail track. The trench may be lined with
precast concrete sections to a carefully laid gradient. Nelson
See:drain tunnel
A shear test on a clay sample after completed consolidation under normal
load, carried out in drained conditions. The strengths given by drained
tests are higher than those from undrained tests. Nelson
a. A borehole drilled into a water-bearing formation or mine workings
through which the water can be withdrawn or drained. Long
b. Any hole provided in the base covering or housing on a machine through
which oil or liquids can be withdrawn. Long
A laborer who regulates flow of tailings, through flumes or pipes (mixture
of waste materials and water resulting from treatment of ore for recovery
of valuable minerals) in back filling (filling of working places from
which all ore has been mined) in such manner that water will be drawn off
and the sand left for filling purposes. DOT