February 27, 2025

Mark A. Smith
President and Chief Executive Officer
NioCorp Developments Ltd.
7000 South Yosemite Street, Suite 115
Centennial, Colorado 80112

       Re: NioCorp Developments Ltd.
           Registration Statement on Form S-1
           Filed February 19, 2025
           File No. 333-285066
Dear Mark A. Smith:

       This is to advise you that we have not reviewed and will not review your
registration
statement.

        Please refer to Rules 460 and 461 regarding requests for acceleration.
We remind you
that the company and its management are responsible for the accuracy and
adequacy of their
disclosures, notwithstanding any review, comments, action or absence of action
by the staff.

       Please contact Timothy S. Levenberg at 202-551-3707 with any questions.



                                                           Sincerely,

                                                           Division of
Corporation Finance
                                                           Office of Energy &
Transportation
cc:   Andrew Thomas, Esq., of Jones Day