Boron (Rio Tinto Borates)
Mining
Type
Operating
Status
🇺🇸 United States, California
Country
Project information
As at 31 December 2025
Aggregation level:
Asset
Aggregation level:
Asset
Report standard:
Jorc
Report standard:
Jorc
Ownership %:
100
Ownership %:
100
Operator:
Yes
Operator:
Yes
Extraction:
Open Pit
Extraction:
Open Pit
Description
As at 31 December 2025
[Partial extraction — source text contained corrupted prose sections; tables recovered where machine-readable] 100%-owned borates mine and refinery at Boron, California; reserves stated as marketable B2O3 product. 2025 production 502 kt B2O3 content.
Mining metrics
Multiple effective dates
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Reserves & resources — detail
As at 31 December 2025
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