Exhibit 99.1
April 12, 2017
| TO: | British Columbia Securities Commission |
| | Alberta Securities Commission |
| | Financial and Consumer Affairs Authority of Saskatchewan |
| | The Manitoba Securities Commission |
| | Ontario Securities Commission |
| | Autorité des marchés financiers |
| | Financial and Consumer Services Commission (New Brunswick) |
| | Nova Scotia Securities Commission |
| | Office of the Superintendent of Securities Service (Newfoundland and Labrador) |
| | Office of the Superintendent of Securities (Prince Edward Island) |
| Office of the Superintendent of Securities, Department of Justice, Government of the Northwest Territories |
| | Nunavut Securities Office, Department of Justice, Government of Nunavut |
| Office of the Yukon Superintendent of Securities, Community Services, Government of Yukon |
Dear Sirs/Mesdames:
I, Calvin G. Yip, P.Eng., am an author of the technical report entitled “Diavik Diamond Mine, Northwest Territories, Canada, NI 43-101 Technical Report” that has an effective date of January 31, 2017 (the “Technical Report”) prepared for Dominion Diamond Corporation (the “Company”).
The Technical Report supports the 2017 Annual Information Form of the Company dated April12, 2017 (the “AIF”). I hereby consent to the public filing of the Technical Report, and to the use of extracts from, or a summary of, the Technical Report in the AIF.
I confirm that I have read the AIF and that the AIF fairly and accurately represents the information contained in the sections of the Technical Report for which I am responsible.
Yours truly,
“Signed and Sealed”
Calvin G. Yip, P.Eng.
