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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of Augusta
      Resource Corporation

We have audited Augusta Resource Corporations internal
  control over financial reporting as of December 31, 2013, based on criteria
  established in Internal Control - Integrated Framework issued by the Committee
  of Sponsoring Organizations of the Treadway Commission (1992 framework) (the COSO criteria). Augusta Resource Corporations management is responsible for maintaining
  effective internal control over financial reporting, and for its assessment of
  the effectiveness of internal control over financial reporting included in the
  accompanying Managements Assessment of Internal Control over Financial
  Reporting. Our responsibility is to express an opinion on the companys
  internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the
  Public Company Accounting Oversight Board (United States). Those standards
  require that we plan and perform the audit to obtain reasonable assurance about
  whether effective internal control over financial reporting was maintained in
  all material respects. Our audit included obtaining an understanding of internal
  control over financial reporting, assessing the risk that a material weakness
  exists, testing and evaluating the design and operating effectiveness of
  internal control based on the assessed risk, and performing such other
  procedures as we considered necessary in the circumstances. We believe that our
  audit provides a reasonable basis for our opinion.

A companys internal control over financial reporting is a
  process designed to provide reasonable assurance regarding the reliability of
  financial reporting and the preparation of financial statements for external
  purposes in accordance with International Financial Reporting Standards as
  issued by the International Accounting Standards Board. A companys internal
  control over financial reporting includes those policies and procedures that (1)
  pertain to the maintenance of records that, in reasonable detail, accurately and
  fairly reflect the transactions and dispositions of the assets of the company;
  (2) provide reasonable assurance that transactions are recorded as necessary to
  permit preparation of financial statements in accordance with International
  Financial Reporting Standards as issued by the International Accounting
  Standards Board, and that receipts and expenditures of the company are being
  made only in accordance with authorizations of management and directors of the
  company; and (3) provide reasonable assurance regarding prevention or timely
  detection of unauthorized acquisition, use or disposition of the companys
  assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over
  financial reporting may not prevent or detect misstatements. Also, projections
  of any evaluation of effectiveness to future periods are subject to the risk
  that controls may become inadequate because of changes in conditions, or that
  the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Augusta Resource Corporation maintained,
  in all material respects, effective internal control over financial reporting as
  of December 31, 2013, based on the COSO criteria.

We have also  audited, in accordance with  the standards of the Public Company Accounting
  Oversight Board (United States), the consolidated financial statements of Augusta Resource Corporation, which comprise the consolidated statements
  of financial position as at December 31, 2013 and 2012, and the related
  consolidated statements of comprehensive loss, changes in equity and cash flows
  for the years then ended and our report dated March 27, 2014, expressed an
  unqualified opinion thereon that included an explanatory paragraph regarding
  Augusta Resource Corporation's ability to continue as a going concern.



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|Vancouver, Canada |                      
|March 27, 2014    | Chartered Accountants

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