Minerals Technologies Inc.

Minerals Technologies Inc. notified California AG on Nov 30, 2020 of a data breach, which occurred on Oct 20, 2020. Data exposed: Social Security number, Financial / bank account, Health insurance, Date of birth, Email address, Phone number, Postal address, Name.

Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization: Minerals Technologies Inc.
Source: California AG · source record
Date reported: Nov 30, 2020
Date(s) of breach: Tuesday, October 20, 2020
Residents affected: Not published by this source
Data exposed: Social Security number Financial / bank account Health insurance Date of birth Email address Phone number Postal address Name
Notice letter: Sample notice (PDF)
Discovered: Oct 22, 2020, as stated in the letter
"On October 22, 2020, based upon its preliminary investigation, MTI learned that this incident may have resulted in unauthorized access to the PII of certain MTI employees and their dependents."
Days to notice: 39 days from discovery (Oct 22, 2020) to the California record (Nov 30, 2020). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82). Over the statutory period
Offered in the letter: 24 months of credit or identity monitoring through Experian
Third party: The letter attributes the incident to a vendor or service provider
First seen by BreachTally: 2026-10-30 16:09 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

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Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.