This is a static, two- and three-dimensional, nonlinear, finite element computer program for the analysis of structural and geological systems and is designed specifically for application to the mining problems involving the simulation of excavation in construction sequences. The program is intended for practical analysis, and an effort was made to foresee difficulties in using it. The program uses the direct stiffness method of structural analysis. Degrees of freedom are defined at nodal points and element stiffnesses are assembled to form a symmetric, banded global stiffness matrix. Nodal point forces, which include external loads and internal resisting forces, are expressed in a global load vector. The model is written in Fortran 4 and is currently operational on a cdc cyber 176 computer. Approximately 131k words of memory are required with 3 overlays. Source tape is in ASCII character set. Character set restricts preparation to 9-track, 1/2- in tape only. Identify recording mode by specifying density only. Call NTIS computer products (703-487-4763) if you have any questions.