Within the land plot occupied by a mine, there may be one or more hoisting shafts, and each of which serves a certain well-defined part of the seam or suite of mineral deposits. The area of such part of the seam or suite is called the mine field. Like any area, a mine field is measured in square units, that is, determined by the product of two linear dimensions. Unfortunately, our practicing engineers share their experience very sparingly, and there is no data on this issue in the specialized literature. This article discusses various formulas and methods for determining the dimensions of a mine field.