The Evaluation and Revenue Inspectorate organizes and executes quantity assessment programmes for all shipments of minerals from Jamaica. Through the Shipping Inspectors, tonnages are verified by the displacement method of measurement and assessments made of the royalty on bauxite.

Tonnage information on bauxite is supplied to the Collector General for the collection of Bauxite Production Levy. In addition, the Inspectors also assess the quarry tax payable by all legitimate quarries. Mineral production statistics are made available to relevant agencies.