Figure $1$ presents the framework for the development of a production plan for a gold mining

operation. The material supply chain in this mining complex constitutes two mines $($with

multiple benches as material sources$),$ three processing streams and a refinery$\mathrm{.}1.$ Define decision variables for all the benches of each mine to each plant.

$2.$ Write an equation for the objective function to maximize the profit in this operation.

$3.$ Write inequalities for constraints to define ore supply from each mine, demand from

each plant, blending requirements from each plant, and production policy.

$4.$ Define all the non$-$negative constraints which will be suitable for the LP model.

$5.$ Implement and solve this model $($objective function and constraints$)$ using Microsoft

Excel Solver.