a. Soil or rock formations lacking veins of weakness. Syn: tight formation
b. Blasts or blastholes around which rock cannot break away freely. Nichols, 1
c. Inadequate clearance or the barest minimum of clearance between working parts. Long
d. Unbroken, crack-free, and solid rock in which a naked hole will stand without caving. Long
e. A borehole made impermeable to water by cementation or casing. Long
f. An impermeable rock formation. Long
g. An underground opening having limited space in which to work. Long
h. Lacking in porosity; impervious. Wheeler, R.R.
Source:
Dictionary of Mining, Mineral, and Related Terms












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