HSC Harsco Corporation

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1—Conflict Minerals Disclosure

Item 1.01 Conflict Minerals Disclosure and Report

In accordance with the disclosure requirements promulgated by the U.S. Securities and Exchange Commission (“SEC”), Harsco Corporation (“we,” “our,” “Harsco,” or the “Company) has undertaken efforts to determine the Company’s conflict minerals reporting requirements¹ for the period from January 1 to December 31, 2021. The Company is a market-leading, global provider of environmental solutions for industrial and specialty waste streams. The Company’s operations consist of two reportable segments: Harsco Environmental and Harsco Clean Earth, as well as the Harsco Rail business which is reported as discontinued operations. The Company has locations in approximately 30 countries, including the U.S. The Company was incorporated in 1956.

We are subject to this rule as we have determined that, during 2021, conflict minerals were likely necessary to the functionality or production of products we manufactured or are contracted to manufacture. The Company, as a purchaser of component parts, is several steps removed from the mining of conflict minerals. We do not purchase raw ore or unrefined conflict minerals and we conduct no purchasing activities directly in the DRC or adjoining countries.

The Company has developed a policy statement to support the goals expressed by Congress in enacting Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act. The policy highlights the Company’s commitment to complying with the reporting and due diligence obligations required by SEC rules and regulations, and the Company’s expectations from its suppliers. In addition, the policy includes language encouraging suppliers to source responsibly. The policy resides on our corporate website (https://www.harsco.com/sustainability). The information on the Company’s website does not constitute part of this Form SD.

We have conducted a good faith reasonable country of origin inquiry (“RCOI”) to determine whether the necessary conflict minerals originated in the DRC or an adjoining country or came from recycled or scrap sources.

We began our RCOI by identifying product categories and consumables that may contain conflict minerals. Initial product categories and consumables within this scope included fittings, paint, motors, coatings, air motors, admiralty brass, pipes, welding wire, wire, electrical fittings, lubricants, glass, bushings, electronics, cables, steel parts, fabricated parts, machine parts, castings, hydraulic parts, bearings, power transmissions and tubular parts. Using information derived from Harsco’s procurement systems, supplemented by information supplied by personnel in Harsco’s divisional supply chain, we produced a list of direct suppliers of components and raw materials that may contain conflict minerals. We then conducted a good faith RCOI to determine whether the necessary conflict minerals originated in the DRC or an adjoining country or came from recycled or scrap sources. Our RCOI process included conducting an inquiry of our direct suppliers using the Responsible Minerals Initiative’s Conflict Minerals Reporting Template (“CMRT”). We sent reminders to those suppliers that did not respond to our request to complete a CMRT. Based on the results of our RCOI, which indicated sourcing from the covered countries, we exercised due diligence on the source and chain of custody of the conflict minerals in accordance with the Organization for Economic Co-operation and Development framework².

The Company has elected not to file disclosure under Item 1.01(c) of Form SD in accordance with the “Updated Statement on the Effect of the Court of Appeals Decision on the Conflict Minerals Rule” issued by the Division of Corporation Finance of the SEC on April 7, 2017.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.

Harsco Corporation