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Dominion Diamond Corp.

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Summary

Project:

Ekati

Deposit:Fox Deep
Location:Canada
Commodities:Diamonds
Date:9/6/2017
Report Code:NI43-101
Report Type:PEA
Project Stage:Active Mining & Production
Report details:6-9-2017: Dominion Diamond Corp. announces a PEA report for its Fox Deep deposit at the Ekati project. PEA results for Fox Deep include post-tax NPV (7%) of $187M, IRR of 23%. CALGARY, AB (September 6, 2017) – Dominion Diamond Corporation (TSX: DDC, NYSE:
Resources:(Resource): 45.6Mt @ 0.4cpt (Ind) and 5.4Mt @ 0.4cpt (Inf) at Fox Deep
CP/QP:[Resources]: Peter Ravenscroft (Burgundy Mining Advisors Ltd.)
ABSTRACT:CALGARY, AB (September 6, 2017) – Dominion Diamond Corporation (TSX: DDC, NYSE: DDC) (the “Company” or “Dominion”) is pleased to report the results of a preliminary economic assessment (“PEA”) on the development of an underground operation below the mined out Fox open pit at the Ekati Diamond Mine (“Ekati mine”) in the Northwest Territories of Canada. The Fox kimberlite pipe is located in the Core Zone Joint Venture in which the Company has an 88.9% participating interest. Unless otherwise indicated, all amounts are presented on a 100% basis, and all financial information is presented in US dollars. The Fox pipe was in production as an open pit operation from 2005 to 2014, and produced more than 8.7 million carats. The Fox Deep PEA evaluated the underground development of the Fox pipe, using an incline cave mining method, as an incremental development opportunity to the existing mine plan. The net present value (NPV) calculation for Fox Deep represents the Company’s share of the incremental NPV. This analysis assumes production at Fox Deep from fiscal 2033 to fiscal 2042, which would extend the Ekati life of mine plan by seven years. On February 22, 2017, the Company announced the results from a reverse circulation (“RC”) drilling campaign at Fox Deep in the winter/spring of 2016. The resource model, updated with new data from the 2016 drilling campaign, confirmed the continuity of the resource at depth and identified a deep highergrade zone. As disclosed on April 12, 2017, the indicated mineral resource increased substantially to 45.6 million tonnes and 16.5 million carats as at January 31, 2017, from the previous estimates of 35.2 million tonnes and 11.6 million carats, respectively.

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