Colemanite Ore from Mexico
Colemanite is a naturally occurring white to colorless calcium borate mineral (Ca2B6O11·5H2O) mined primarily from evaporite deposits in California and Turkey. It falls under HTS 2528.00.0010 as a natural calcium borate, unprocessed except for basic concentration, used as a source of boron in various industries. This statistical suffix specifically covers calcium borate variants like colemanite without chemical separation from brine.
Duty Rate — Mexico → United States
Rate breakdown
Import Tips
• Verify mineral composition via assay certificates to confirm calcium borate content exceeds boron thresholds; ensure no brine separation processing to avoid reclassification
• Obtain mining origin documentation for potential preferential tariff treatments under USMCA or similar agreements
• Watch for contamination with other salts that could trigger Chapter 28 chemical headings