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 ?
The REE and trace element analyses were conducted on 17 samples from the ores and wall rocks of the Bojitian gold deposit (Table 7).
To joint with wall rock made of nonuniformly distributed fine grains or coarse grains or joint with discontinuous and nonuniform stress propagation during the course of formation, its microcosmic roughness is always rough.
Zheng, "Calculation discussion about safety factor of unlined loess tunnel wall rock structure under earthquake," Rock and Soil Mechanics, vol.
Three fundamental properties influence the rate at which arc magma ascends: i) magma is less dense than the wall rocks and is, therefore, buoyant, ii) a magma with lower viscosity rises with greater ease than a more viscous magma (therefore, mafic magma generally rises more readily than felsic magma, which is likely to be trapped in magma chambers where it cools to form a pluton), and iii) magma rises more rapidly in an extensional environment than in a compressional setting because widening fractures create space for rising magma to exploit.
Early-stage white muscovite and fluorite (commonly looks orange on mine walls, but is actually light green when removed and cleaned) contain pyrite; these minerals grade from wall rock replacement into open-space filling along vein walls.
Drill collars were located outside of the breccia pipe within the wall rock that hosts the breccia.
Regional Transport System Manager Ross IAnson says while a significant amount of work has been undertaken in the gorge to clear the slips which have come down since April, geotechnical engineers have now confirmed that a large area above the Kerrys Wall rock face is highly unstable, with an imminent risk of further significant slips or rockfalls.
These experiments aim to help people understand the processes involved when crustal rocks are melted by hot magma coming from deeper within the earth, as well as how crystals in a boundary layer influence melt rates of the wall rock and nature of mixing of the melt with the warm environment.
In this method, wall rock has to be cut to make operation space.
The hanging wall rock to a depth of approximately 3 m is intensely jointed having a fracture frequency greater than 4 per metre.
No evaluation of possible larger scale open pit mining of lower grade material including the high grade shoots, their lower grade portions, stockworks of small veinlets, and intervening low grade, but extensively altered wall rock was attempted.