EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Minerals Technologies Inc.:

We consent to the incorporation by reference in the registration statements (Nos. 333-160002, 33-59080, 333-62739, 333-138245, 333-206244 and 333-249761) on Form S-8 of Minerals Technologies Inc. of our reports dated February 19, 2021, with respect to the consolidated balance sheets of Minerals Technologies, Inc. as of December 31, 2020 and 2019, and the related consolidated statements of income, comprehensive income, changes in shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes and financial statement schedule (collectively, the “consolidated financial statements”), and the effectiveness of internal control over financial reporting as of December 31, 2020, which reports appear in the December 31, 2020 annual report on Form 10-K of Minerals Technologies Inc.

/s/ KPMG LLP

New York, New York

February 19, 2021