An assay made by a third party to provide a basis for settling disputes between buyers and sellers of ore.

The actual assay value of a core sample as opposed to a cut value which has been reduced by some arbitrary formula.

An enlargement of an entry, drift, or level at a shaft at which cages stop to receive and discharge cars, personnel, and material. An underground station is any location where stationary electrical equipment is installed. This includes pump rooms, compressor rooms, hoist rooms, battery-charging rooms, etc.

A firm commitment made by a broker or other financial institution to purchase a block of shares at a specified price.

A shaft through which air leaves the mine.

A uranium mineral with a high uranium oxide content. Frequently found in pegmatite dykes.

A radioactive, silvery-white, metallic element.