Inspect the Mineral Feeder and Identify Mineral Deficiencies

What happens here

Examine the 'cafeteria-style' free choice mineral feeder. This feeder is a wooden trough divided into multiple compartments, each designed to hold a different specific mineral. It is covered by a black, curved sheet of material (possibly metal or heavy plastic) to protect the minerals from rain. By observing which compartments are empty or have low levels of minerals, you can identify which minerals your cattle are most frequently consuming and, therefore, which are most lacking in their diet and the pasture's soil.

Goal: Determine which specific minerals are most needed by the cattle and the soil.