As filed with the Securities and Exchange Commission on May 18, 2018

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
_______________

FORM 20-F/A
(Amendment No. 1)
_______________

[    ]     REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

[X]     ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2017

OR

[    ]     TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

[    ]     SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number 001-35278

Primero Mining Corp.
(Exact name of Registrant as specified in its charter)
_________________

British Columbia, Canada
(Jurisdiction of incorporation or organization)

79 Wellington Street West, TD South Tower Suite 2100, Toronto, ON, M5K 1H1, Canada
(Address of principal executive offices)

Raymond Polman, Chief Financial Officer
79 Wellington Street West,
TD South Tower Suite 2100,
Toronto, ON, M5K 1H1, Canada
Telephone No.: (416) 814 3160
e-mail: info@primeromining.com
(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)
___________________________________________

Securities registered or to be registered pursuant to Section 12(b) of the Act:

Title of each class: Name of each exchange on which registered:

Securities registered or to be registered pursuant to Section 12(g) of the Act: Common Shares, without par value

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report: 193,045,822 Shares of Common Stock

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.
Yes [    ]      No [X]

If this is an annual or transition report, indicate by check mark if the Registrant is not required to file pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.
Yes [    ]     No [X]

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.
Yes [X]      No [    ]

Indicate by check mark whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).
Yes [X]     No [    ]

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act.

Large accelerated Filer [    ] Accelerated Filer [    ] Non-accelerated Filer [X]

Indicate by check mark which basis of accounting the Registrant has used to prepare the financial statements included in this filing:

U.S. GAAP [    ] International Financial Reporting Standards as issued by the International Accounting Standards [X] Other [    ]

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the Registrant has elected to follow.

Item 17 [    ]      Item 18 [    ]

If this is an annual report, indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
Yes [    ]     No [X]

EXPLANATORY NOTE

Primero Mining Corp. is filing this Amendment No. 1 to its Annual Report on Form 20-F for the year ended December 31, 2017 (the “Form 20-F”), which was filed with the Securities and Exchange Commission on April 20, 2018, to submit the Interactive Data File (as defined in Rule 11 of Regulation S-T) for that fiscal year as Exhibit 101 to the Form 20-F in accordance with Rule 405 of Regulation S-T. Exhibit 101 was omitted from the Form 20-F in accordance with the 30-day grace period provided under Rule 405(a)(2)(ii) of Regulation S-T.

Except as set forth above, this Form 20-F/A does not modify or update any of the disclosure in the Form 20-F. This Form 20-F/A speaks as of the time of filing of the Form 20-F, does not reflect events that may have occurred subsequent to such filing, and does not modify or update in any way disclosure made in the Form 20-F.

ITEM 19. EXHIBITS

The following exhibits are furnished as part of this Amendment No. 1 to the Form 20-F:

Exhibit
Number	Description
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

SIGNATURE

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this Amendment No. 1 to Form 20-F on its behalf.

Date: May 18, 2018	Primero Mining Corp.
	/s/ Raymond Polman
	Raymond Polman
	Chief Financial Officer