Wall Rock


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wall rock

[′wȯl ¦räk]
(geology)
Rock that encloses a vein.

Wall Rock

 

mountain rock lying directly against a layer or vein of mineral ore. Wall rock is called the roof or floor of a deposit when in a sloping or gently inclined position; it is called the hanging or lying side when it is on a steep incline. The properties and condition of the wall rock influence the selection of the system of extracting minerals, as well as the technical-economic indexes of the construction and exploitation of mining enterprises.

References in periodicals archive ?
This alteration replaces, to a greater or lesser degree, feldspars and biotite in the wall rock with sericite, some of it quite coarse-grained.
In resuing, not only ore is mined out, but wall rock is cut as well to make a minimum working space (about 0.
The end result is that the presence of the silver tenors in the wall rock may act to broaden economic zones or at least decrease waste material in a mining scenario.
The nature, extent, and intensity of wall-rock alteration and the extent of widespread stockwork or disseminated type mineralization in the altered wall rocks at these Ace properties is not known and may be critical.
In the A4 Vein System, gold occurs in quartz veins which contain high grade pockets (3 - 4 oz/t Au) In addition to gold occurring in the quartz veins, it also occurs in the adjacent wall rock units (the andesite dyke, fault gouge and fresh granodiorite).
Historical exploration for primary sources from adits yielded a series of encouraging grades: approximately 50,000 tonnes yielded an average of 6 g/t Au both in wall rock schist and quartz veins; quartz veins yielded 4 to 12 g/t Au; and 20 tonnes of crushed quartz vein material yielded 34.
There is some indication that the wall rock on either side of the quartz vein may also contain lower grade silver mineralization.
Also of interest on the Goldsmith Property are reports of gold values obtained from the sulphide-altered wall rock between and adjacent to the quartz veins.
This early porphyry is a wall rock to mineralization and has been over printed with potassic alteration and contains quartz veinlets with copper and molybdenum sulfides.
Specular hematite is commonly present near veins, and pale green sericite-chlorite characterizes the altered wall rocks of the shear zones.
Mineralized zones in the porphyry deposits always has lower resistivity and higher chargeability than wall rocks because these deposits have high values of sulfidic minerals such as pyrite, chalcopyrite, chalcocite, covelite and bornite [5,3].