Explanation:

- Mining:

- Involves the extraction of minerals from the ground.

- Considered a primary industry, not an auxiliary to trade.

- Insurance:

- Provides protection against financial loss.

- Supports trade by mitigating risks.

- Warehousing:

- Involves storing goods for future distribution.

- Facilitates the storage process, aiding trade.

- Transport:

- Moves goods from producers to consumers.

- Essential for distribution, thus supporting trade.

Mining is the correct answer, as it is not an auxiliary to trade. It is a primary activity focused on extracting natural resources and not directly related to facilitating trade.