a. In hydraulic mining, discharging water from nozzles at auriferous gravel.
b. The act or process of driving standpipe, drivepipe, or casing into and through overburden. Long
c. Erosion by percolating water in a layer of subsoil, resulting in caving and in the formation of narrow conduits, tunnels, or pipes through which soluble or granular soil material is removed; esp. the movement of material, from the permeable foundation of a dam or levee, by the flow or seepage of water along underground passages. See also: water creep AGI
d. The flow of water under or around a structure built on permeable foundations that will remove material from beneath the structure. Nelson
e. The tubular depression caused by contraction during cooling, on the top of iron and steel ingots. See also: pipe
Source: Dictionary of Mining, Mineral, and Related Terms












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