Extrapolating: Estimate made from set of known values

Plan Map:    Map made by projection of information onto a horizontal plane.  Different plan maps are made for different mine levels for underground mines.  Geologic maps are a type of plan map where the geology is projected onto the horizontal plane corresponding to sea level.

Arithmetic Mean:   Values are summed and divided by the total number of values.

Bisector:   A straight line that bisects (halves) a line.

Prism:   A polyhedron with two faces that are polygons in a parallel planes, and the other faces are parallelograms or rectangles.

Dilution:   Waste that is not segregated from ore during mining, thus decreasing the grade of the ore and increasing the tons.

Resource:   The amount of a substance, or “endowment”, contained in a deposit and ultimately available for extraction and use.