"Let's model me a mine"
M.E.G.M.S.
Mining & Exploration Geological Modelling Services
The Set Depth dialog box allows you to specify the depth for a unit by entering that depth as a number (as opposed to manipulating the depth of the unit with the mouse).
The depth refers to the bottom boundary of the unit, often called the "To" value on borehole logs.
You can show this dialog box by using the Set Base Depth editing tool.