Exhibit 3.66

Exhibit 3.66

CORPORATE ACCESS NUMBER: 2018172110

Government of Alberta

BUSINESS CORPORATIONS ACT

CERTIFICATE OF AMALGAMATION

COAL VALLEY RESOURCES INC.

IS THE RESULT OF AN AMALGAMATION FILED ON 2014/04/24.

8:30 a.m. MDT

Amalgamate Alberta Corporation—Registration Statement

Alberta Registration Date: 2014/04/24

Corporate Access Number: 2018172110

Service Request Number: Alberta Corporation Type: Legal Entity Name:

French Equivalent Name: Nuans N umber:

Nuans Date:

French Nuans Number: French Nuans Date:

REGISTERED ADDRESS Street:

Legal Description:

City: Province: Postal Code:

RECORDS ADDRESS Street:

Legal Description: City:

Province: Postal Code:

ADDRESS FOR SERVICE BY MAIL

Post Office Box: City:

Province:

Postal Code: Internet Mail ID:

21344227

Named Alberta Corporation

COAL VALLEY RESOURCES INC.

2900-10180 101 ST EDMONTON

ALBERTA T5J 3V5

2900-10180 101 ST EDMONTON

ALBERTA T5J 3V5

Share Structure: THE CORPORATION IS AUTHORJZED TO ISSUE AN UNLIMlTED NUMBER OF COMMON SHARES

Share Transfers Restrictions: SEE ELECTRONIC ATTACHMENT Number of Directors:

Min Number Of Directors:

Max Number Of Directors: Business Restricted To: Business Restricted From: Other Provisions:

10

NONE NONE

SEE ELECTRONIC

ATTACHMENT

Professional Endoresement

Professional Endorsement

Provided:

Future Dating Required:

Registration Date: 2014/04/24

Director

Last Name: First Name:

Middle Name:

MCCAUGHAN SEAN

Street/Box Number: 1600 OXFORD TOWER, 10235 101 ST City: EDMONTON

Province: ALBERTA

Postal Code: Country:

T5J 3G 1

Resident Canadian: Y Named On Stat Dec: Y

Last Name: CHAMBERS First Name: DEAN Middle Name: R.

Street/Box Number: 5TH FLOOR, 1133 YONGE ST

City: TORONTO

Province: Postal Code: Country:

ONTARIO M4TYY7

Resident Canadian: Y Named On Stat Dec:

Amalgamating Corporation

Corporate Access Number Legal Entity Name

2016412401 COAL VALLEY RESOURCES INC.

2016739431 1673943 ALBERTA LTD.

Attachment

Attachment Type

Microfilm Bar Code

Date Recorded

Other Rules or Provisions

ELECTRONIC

2014/04/24

Statutory Declaration

10000207112460338

2014/04/24

Restrictions on Share Transfers

ELECTRONIC

2014/04/24

Registration Authorized By: LEANNE C. KRAWCHUK

Articles of Amalgamation

For

COAL VALLEY RESOURCES INC.

Share Structure: THE CORPORATION IS AUTHORIZED TO ISSUE AN UNLIMITED NUMBER OF COMMON SHARES

Share Transfers

Restrictions:

Number of Directors: 1

Min Number of Directors:

SEE ELECTRONIC ATTACHMENT

Max Number of Directors: 10

Business Restricted To: NONE Business Restricted From: NONE

Other Provisions: SEE ELECTRONIC A

Registration Authorized By: LEANNE C. KRAWCHUK SOLICITOR

SHARE TRANSFER RESTRICTIONS So long as the corporatjon is a private issuer as defined in securities law, no securities of the corporation, other than non-convertible debt securities, shall be transferred without the consent of the directors, expressed by a resolution.

6664334_1 NATDOCS

OTHER PROVISIONS

1. Lien On Shares

The corporation shall have a first and paramount lien on a share registered in the name of a shareholder or his legal

representative, whether registered solely or jointly with any other person, for a debt of that shareholder to the corporation, including an amount unpaid in respect of a share issued by the corporation on the date it was incorporated under The Business Corporations Act (Alberta), whether the period for payment, fulfilment or discharge of that debt shall have actually arrived or not. The lien shall extend to all dividends and distributions of capital declared or otherwise payable on such shares.

2. Appointment of Directors

The directors may, between annual general meetings, appoint

one (1) or more additional directors of the corporation to serve

until the next annual general meeting, provided that the

number of additional directors shall not at any time exceed one-

third (1/3) of the number of directors who held office at the expiration of the last annual meeting of the corporation.

3. Borrowing

The directors may

(a) borrow money on the credit of the corporation,

(b) issue, reissue, sell or pledge debt obligations of the

corporation,

(c) give a guarantee on behalf of the corporation to secure performance of an obligation of any person, and

(d) mortgage, hypothecate, pledge or otherwise create a security interest in all or any property of the

corporation, owned or subsequently acquired, to secure any obligation of the corporation.

4. Meetings of Shareholders

Meetings of shareholders of the corporation may be held inside or outside the Province of Alberta.

6664317_1 NATDOCS