UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934

Filed by the Registrant  ☒Filed by a Party other than the Registrant  ☐

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☐Preliminary Proxy Statement

☐Confidential, for Use of the Commission Only (as permitted by Rule 14a‑6(e)(2))

☐Definitive Proxy Statement

☒Definitive Additional Materials

☐Soliciting Material Pursuant to §240.14a‑12

Gold Resource Corporation

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on June 22, 2018 GOLD RESOURCE CORPORATION You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. 0000382281_1 R1.0.1.17 See the reverse side of this notice to obtain proxy materials and voting instructions. Meeting Information Meeting Type: Annual Meeting For holders as of: April 17, 2018 Date: June 22, 2018Time: 8:00 AM MDT Location: Embassy Suites Hotel 10250 E. Costilla Ave Centennial, CO 80112

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: Have the information that is printed in the box marked by the arrow (located on the by the arrow (located on the following page) in the subject line. How To Vote Please Choose One of the Following Voting Methods marked by the arrow available and follow the instructions. 0000382281_2 R1.0.1.17 Vote In Person: If you choose to vote these shares in person at the meeting, you must request a "legal proxy." To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a voting instruction form. 1. Annual Report2. Notice & Proxy Statement How to View Online: following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET:www.proxyvote.com 2) BY TELEPHONE:1-800-579-1639 3) BY E-MAIL*:sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before June 08, 2018 to facilitate timely delivery.

The Board of Directors recommends that you vote FOR the following: 1. Election of Directors Nominees 01 Bill M. Conrad 02 Jason D. Reid 03 Gary C. Huber 04 Alex G. Morrison The Board of Directors recommends you vote FOR the following proposal(s): 2. Advisory vote to approve executive compensation. 3. Ratify EKS&H LLLP as independent registered accounting firm for 2018. NOTE: Other Business: To transact such other business as may properly come before the meeting or any adjournment thereof. 0000382281_3 R1.0.1.17 Voting items

0000382281_4 R1.0.1.17 Voting Instructions