Here you can review your mines built and check they remain economic to operate since the prices that minerals will sell for will fluctuate in the game. You might also decide to set a percentage of the minerals mined to go to your warehouse for storage and sell them later when you hope the sales price is higher, or to help provide a buffer to help consistently fulfil any contracts you have or to sell a large quantity at a time you hope to influence the price negatively and disrupt mining competitors.
In theory selling less to the market will increase prices because of the laws of supply and demand but with a variety of company's all doing different things and fluctuations in world market demands, nothing is guaranteed when attempting this strategy.
Click on Warehouse for a summary of minerals you have stored and how to sell them.
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