There are also shortcut icons that highlight points of interest inside the scrollbar. To travel up and down your mine, click the green buttons on the left side of the screen or use your scroll wheel. You can use the money to buy more employees, upgrade your drill, or increase your ore carrying capacity. As you gather minerals, you can sell them at the sell center. Mine, you will continue to make more and more money and upgrade your mining capacities. The goal of the game is to mine the rarest and most valuable materials that you can.