What is the term used for the stockpile formed under a fixed or adjustable stacker?

The term used for the stockpile formed under a fixed or adjustable stacker is "cone." When material is being deposited from a fixed or adjustable stacker, the angle of repose of the material causes it to form a conical shape. This is due to the way the material cascades down from the stacker onto the ground, causing it to spread out and build up in a conical configuration.

The conical shape is practical for stockpiling because it allows for efficient drainage of water and easy access to the material for loading or sampling. The apex of the cone points upwards, and as the stockpile grows, it forms a circular base as the material is deposited along the perimeter.

Other terms like pyramid, heap, and cylinder do not accurately describe the specific shape that results from the stacking process. While a heap may refer to a pile of material in a loose formation, it does not convey the specific geometric shape that is typically observed with stockpiles created by stackers. A cylinder, while it denotes a three-dimensional shape with a circular base, does not reflect the typical deposit pattern of material, which favors a conical form.