Nickel Laterite

Nickel laterite is a type of soil and weathered rock that forms when ultramafic rocks (rocks rich in iron and magnesium) break down over millions of years in tropical climates, concentrating nickel near the surface. Because the parent ultramafic rocks often contain serpentine and amphibole minerals, nickel laterite deposits frequently contain naturally occurring asbestos fibers mixed in with the ore.

Origin

The word "laterite" comes from the Latin later, meaning "brick," coined by Scottish geologist Francis Buchanan-Hamilton in 1807 to describe iron-rich tropical soils in India that hardened like bricks when cut and dried. The recognition of nickel-rich laterites as commercial ore bodies dates to the development of New Caledonian deposits in the late 1800s.

Significance in Asbestos Context

Nickel laterite deposits are a recognized source of occupational and environmental asbestos exposure because they form from the same ultramafic parent rocks that host chrysotile and tremolite asbestos. Miners, processing-plant workers, and people living near nickel mines in places like New Caledonia, the Philippines, Indonesia, Cuba, and parts of Australia may inhale asbestos fibers liberated during excavation, crushing, and ore handling. For a patient whose work or residential history includes nickel mining or refining, this geological link can be central to identifying the source of exposure, and fiber-burden or mineralogical analysis of lung tissue can sometimes match the fiber types found in specific laterite deposits.

Example Sentence

His expert report traced the tremolite fibers found in the lung tissue sample back to the nickel laterite ore he had handled for two decades at the smelter.

Related Terms

Ultramafic Rock, Serpentine, Tremolite, Chrysotile, Naturally Occurring Asbestos, Provenance Analysis

Notes

• If your work history includes nickel mining, milling, smelting, or refining, document the specific mine sites, dates, and job tasks. The geological source of the ore can be tied to particular asbestos fiber types.
• Ask whether fiber-burden analysis or electron microscopy was performed on any biopsy or autopsy tissue; matching fiber mineralogy to a laterite source can strengthen causation evidence.
• Preserve any employer records, shift logs, MSDS sheets, or industrial hygiene reports referencing dust exposure, ore grade, or country of origin of the ore being processed.
• Environmental exposure near nickel laterite operations (living downwind, family members handling contaminated work clothes) can also be relevant. Note residential addresses and dates.