Document:

Preferred Supplier Agreement

 Exhibit 10.14 
 CERTAIN MATERIAL (INDICATED BY THREE ASTERISKS) HAS BEEN OMITTED FROM THIS DOCUMENT PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION. 
 Preferred Supplier Agreement 

This Preferred Supplier Agreement (this “Agreement”) is entered into effective as of the
    10     day of February, 2012 (the “Effective Date”), by and between ChemRock Technologies, L.L.C., a Texas limited liability company with a principal business office in Lafayette,
Louisiana (“ChemRock”), and Green Field Energy Services, Inc., a Delaware corporation with a principal business office in Lafayette, Louisiana (“Green Field”), who are sometimes also referred to, each individually, as a
“party,” and collectively, as the “parties” to this Agreement. 
 Recitals 

ChemRock is in the business of developing, manufacturing, blending, and selling chemicals used in various applications, including without
limitation applications used in the exploration and production of oil and gas, and in industrial markets. 
 Green Field is in
the business of, among other things, providing pumping services, field services, and the sales and supply of chemicals to oil and gas production operators and oil and gas service companies. 

ChemRock and Green Field have agreed that ChemRock will be Green Field’s preferred supplier for the stimulation and well fracture
chemical products (or categories of products) listed on Schedule A, attached to and made a part of this Agreement (the “Products”), on the terms and conditions set forth below. 

Agreement 

NOW, THEREFORE, in consideration of the mutual covenants and agreements set forth in this Agreement, the parties agree as follows:

 1. General Purpose and Scope 
 1.1 Preferred Supplier. Except as otherwise set forth in this Agreement, during the Term of this Agreement, ChemRock will be Green Field’s preferred supplier for the stimulation and well
fracture chemical Products (or categories of Products) listed on Schedule A, for use by Green Field or for sale to its customers in the Territory. The parties may, by written agreement, amend or modify Schedule A to add or delete
Products from time-to-time. 
 1.2 Green Field Product Logo. All Products purchased by Green Field for resale under this
Agreement will be sold by Green Field to its customers under the Green Field logo. 
 1.3 Territory. The
“Territory” covered by this Agreement means and includes the United States and Canada. 
 2. Obligations of ChemRock

 2.1 Supply of Products. During the Term of this Agreement, ChemRock will use good faith, reasonable efforts to
supply to Green Field all Products needed by Green Field to service its customers in the Territory on a timely basis. Upon receipt of a purchase order for Products from Green Field, ChemRock will arrange for the production or supply of the Products
and will make the Products available to Green Field for pickup at ChemRock’s blending facility or at any other point of manufacturing or supply point designated by Green Field and ChemRock from time-to-time (the “Delivery Points”).
Title to the Products and the risk of loss will pass to Green Field when the Products are picked up by Green Field or its designees at the Delivery Points. 
  

*** Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has
been requested with respect to the omitted portions. 

  

 2.2 Documentation. ChemRock will prepare and deliver to Greenfield the following
documentation for the Products that ChemRock sells to Greenfield: (i) delivery tickets for the Products delivered by ChemRock to the Delivery Points for pickup by Greenfield; (ii) material safety data sheets that comply with all applicable
U.S. rules and regulations for the Products; and (iii) technical product information detailing the application, physical properties, and typical application rates for the Products. 

2.3 Limited Warranties. ChemRock warrants only (i) that the Products sold to Green Field will be free from defects and fit
for their intended purpose and perform as specified for the period of time as is described in the individual Product’s specifications, as determined by ChemRock, or the ChemRock supplier, and communicated in writing to Green Field in connection
with each purchase order submitted by Green Field; and (ii) that the Products will not contain any components that ChemRock is not authorized to use or sell to Green Field. Green Field acknowledges and agrees that except as specifically set
forth in this Section 2.3, ChemRock makes no warranties, whatsoever, with respect to the Products, and there are hereby excluded all warranties, conditions, representations, statements, and liability regarding the Products, whether or not
expressly set out in any other document or implied by law, statute, or custom, or which would otherwise be applicable to the Products, including but not limited to any warranty relating to the performance of the Products or their fitness for any
purpose or any implied warranty of merchantability or any implied warranty arising from course of dealing or usage. 
 2.4
Conformity of Products. Green Field will have the right to reject any Products that do not conform to the quality specifications and requirements provided by ChemRock, and acknowledged by Green Field, by notifying ChemRock in writing within
thirty (30) days after Green Field receives the Products. If Green Field does not notify ChemRock that is has rejected a Product within thirty (30) days after Green Field receives the Product, then the Product will be presumed and deemed
to be acceptable to Green Field. 
 3. Obligations of Green Field 

3.1 ChemRock as Preferred Supplier. Green Field agrees to purchase Products (as identified in Schedule A of this Agreement) from
ChemRock which may be required by Green Field to service its customers in the Territory. As its preferred supplier, it is Green Field’s intent to utilize ChemRock as its primary supplier for all stimulation chemicals, however, Green Field
reserves the right to purchase similar or identical products from other suppliers based on, among other things, pricing, product availability, logistics, and Green Field customer requirements. Green Field will use its commercially reasonable efforts
to purchase at least [***] of its annual Product requirement from ChemRock. 
 3.2 Facilitation of Orders. Green Field
will use its good faith, reasonable efforts to provide ChemRock with the volumes, quantities, and specifications for Products to be supplied by ChemRock to Green Field immediately upon Green Field’s receipt of an order from its customer or upon
Green Field’s determination of its need for Products for future activities, in order to facilitate ChemRock’s ability to provide the Products at competitive prices and in a timely manner. Further, Green Field will assist ChemRock in
connection with each of its orders by arranging for and coordinating: (i) the pickup of the Products by Green Field at the Delivery Points; (ii) review of project specifications with Green Field’s customers to determine the proper
product applications; and (iii) delivery of Products to the shipping port provided that all shipping and delivery costs of Products from the Delivery Point to the shipping port will be borne by Green Field. 

 
 *** Certain information in this document has been omitted and filed
separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
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 4. Pricing, Specifications, Payments, and Related Terms 

4.1 Pricing, Updates. ChemRock recognizes Green Field’s need for timely, updated price information from ChemRock in order to
properly quote prices to its customers. ChemRock will use commercially reasonable efforts to provide weekly updates for any price changes from its suppliers, and no longer than bi-monthly updates, with Product prices designated on price sheets as
f.o.b. ChemRock stock point, or delivered to Green Field Delivery Locations. ChemRock will communicate all prices to Green Field in writing to the designated Green Field representative whom will be identified to ChemRock from time to time by Green
Field in writing. Notwithstanding the terms in this 4.1, ChemRock may experience sudden cost increases for Product it supplies to Green Field without adequate prior notification from its supplier. In these cases cost increases will cause ChemRock to
increase prices to Green Field. In all such instances of inadequate cost increase notification ChemRock will provide Green Field with documentation of any cost increases as may be provided to ChemRock by its suppliers. 

4.1.1 Pricing, Calculation. ChemRock’s prices to Green Field are based upon a “cost-plus” price calculation method
rather than a “competition-based” pricing method. In the cost-plus method, ChemRock will disclose its cost of materials to Green Field and calculate prices to Green Field using a cost plus 5% calculation. Prices will be designated on price
sheet as f.o.b. stock point, or delivered to Green Field location. 
 4.2 Billing and Payments. ChemRock will invoice
Green Field for all Products purchased by Green Field when ChemRock delivers the Products to the Delivery Points for pickup by Green Field, unless a separate agreement in writing provides for a partial pre-payment or full pre-payment. Green Field
will pay ChemRock the amounts due on each invoice in full within thirty (30) business days after the date of each invoice. Any payments not in paid in full within a forty-five (45) day period will bear interest at an annual rate of one and
a half (1.5%) percent until paid in full. 
 5. Term and Early Termination 

5.1 Term. Subject to earlier termination as set forth below, the initial term of this Agreement (the “Initial Term”)
begins on the Effective Date, set forth above, and will end on the last day of the twelfth (12th) calendar month following the Effective Date (the “Initial Term End Date”). 

5.2 Extensions of Term. Subject to earlier termination as set forth below, following the Initial Term End Date set forth in
Section 5.1, the term of this Agreement will be automatically extended for successive terms, consisting of twelve (12) months each (the “Extension Terms”), unless either ChemRock or Green Field gives the other party written
notice of an election not to extend the term of this Agreement beyond the Initial Term End Date, or beyond an Extension Term, at least sixty (60) days before the end of the then-current term. 

5.3 Definition of Term. In this Agreement, the Initial Term and any Extension Terms (if the term of this Agreement is extended to
include any Extension Terms as set forth above), will be sometimes collectively referred to as the “Term” of this Agreement. 
 5.4 Early Termination by ChemRock. ChemRock may terminate this Agreement upon written notice to Green Field if Green Field fails to cure any material default by Green Field under this Agreement
within 30 days after ChemRock gives Green Field written notice of the default. 
 5.5 Early Termination by Green Field.
Green Field may terminate this Agreement upon written notice to ChemRock if ChemRock fails to cure any material default by ChemRock under this Agreement within 30 days after Green Field gives ChemRock written notice of the default. 

 
 *** Certain information in this document has been omitted and filed
separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
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 5.6 Immediate Termination. Either party may terminate this Agreement immediately upon
written notice to the other party if (i) a petition for relief in bankruptcy is filed by or against the other party with the United States Bankruptcy Court without a dismissal of the petition within 30 days after the filing; (ii) a
petition for relief is filed by or against the other party under any reorganization, arrangement, composition, readjustment, liquidation, or dissolution statute, law, or regulation providing for such relief, or any similar such relief, without a
dismissal of the petition within 30 days after the filing; (iii) the other party makes an assignment for the benefit of its creditors; or (iv) the other party is adjudicated as bankrupt or insolvent. 

5.7 Payments on Termination. Upon termination of this Agreement, Green Field will immediately pay ChemRock all amounts owed to
ChemRock as of the date of the termination. 
 5.8 Cancellation of Orders. Upon termination of this Agreement, Green
Field will be responsible for paying ChemRock the full purchase price of all Products, as well as any third-party charges, cancellation charges, restocking fees, freight charges, and similar costs or charges associated with the Products, for
Products that have been ordered by Green Field, if production or delivery of the Products has been initiated by ChemRock, or ChemRock has entered into binding agreements with any third-party suppliers or manufacturers for the purchase or manufacture
of the Products. Alternatively, upon termination of this Agreement, ChemRock will have the right to cancel all orders for Products that have been ordered but not picked up by Green Field, and will have the right to return or transfer the Products to
ChemRock’s warehouses or elsewhere, or sell the Products to other ChemRock customers, without any obligation or liability to Green Field. 
 5.9 Continuing Obligations. Upon the termination of this Agreement, the respective obligations of the parties under this Agreement will be of no further force and effect except that obligations or
provisions of this Agreement which by their nature are intended to be surviving and continuing with respect to a party will survive the expiration or termination of this Agreement and will remain binding on the party until expressly released by the
other party in writing. 
 6. Confidentiality 
 6.1 Protected Information. It is acknowledged that in connection with this Agreement, each party (the “Providing Party”) will be providing the other (the “Receiving Party”)
with, or the Receiving Party will be given access to, written and other materials and proprietary information that is confidential to Providing Party. For purposes hereof, such materials and information will be referred to as “Protected
Information,” and will mean and include all written or other confidential or proprietary information of Providing Party that Receiving Party may be provided with, apprised of, observe, or gain knowledge about, including but not limited to, all
originals, drafts, copies, or reproductions (irrespective of the form) of any and all plans, technical information, processes, know-how, trade secrets, patent applications, data (technical and non-technical), formulas, patterns, compilations
(including compilations of customer information), programs (including models), devices, methods (including design methods), techniques, drawings (including equipment drawings), financial information (including sales forecasts), pricing, lists of
actual or potential customers or suppliers (including identifying information about those customers), business contacts and lists, marketing channels, operational information, planning or strategy information, research and development information,
information about existing and future products, information about personnel matters, and other proprietary information, intellectual property, patents, trade secrets, or “know how” related in any manner to the Products or the business
operations of Providing Party, whether or not marked or stamped “Confidential,” “Proprietary,” “Do Not Disclose,” or with a similar term or terms. 

6.2 Information Not Included. Notwithstanding anything to the contrary contained in this Agreement, the term “Protected
Information” does not include any information that (i) at the time of disclosure to Receiving Party or thereafter, is or becomes generally available to and known by the public, other than as a result of an unauthorized disclosure by
Receiving Party or its members, owners, employees, directors, officers, 
  
 *** Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions.

  
 4 

 
representatives, or agents, or (ii) was available to Receiving Party from a source other than Providing Party, on a non-confidential basis, provided that such source is not, and was not,
bound by a confidentiality agreement or obligation with Providing Party, or (iii) has been independently developed by Receiving Party without violation of any of Receiving Party’s obligations to Providing Party, provided that in any of the
foregoing cases, before using in any manner inconsistent with the terms of this Agreement any information regarding Providing Party that Receiving Party believes is not included in the Protected Information, Receiving Party must first advise
Providing Party of the nature of the information and the reasons why Receiving Party believes the information is not subject to the limitations on use set forth in this Agreement. 

6.3 Obligations of Confidentiality. Receiving Party will maintain the Protected Information in utmost confidence, and will not,
without the prior written consent of Providing Party, disclose, furnish, or divulge the Protected Information, in whole or in part, to any person, firm, corporation, or entity of any nature, other than Providing Party or its representatives.
Further, at no time that this Agreement remains in effect or at any time thereafter will Receiving Party, individually or jointly with others, for the benefit of Receiving Party or any third party, publish, disclose, use, or authorize anyone else to
publish, disclose, or use, any of Providing Party’s Protected Information, without in each instance first obtaining the prior written consent of Providing Party. Upon termination of this Agreement for any reason, or at any other time upon
Providing Party’s request, Receiving Party will forthwith (i) deliver to Providing Party (without retaining copies thereof) any and all writings and other property in Receiving Party’s possession or control relating to or containing
Protected Information, and (ii) destroy all documents, memoranda, notes, and other writings whatsoever prepared by Receiving Party based on any of the Protected Information, and in such case, Receiving Party’s obligations of
confidentiality contained herein will remain in effect for the maximum period allowed by law. 
 6.4 Injunctive Relief.
Receiving Party acknowledges and agrees that any unauthorized disclosure will constitute a material breach of duty owed to Providing Party, and that in the event of a breach of this Agreement by Receiving Party, Providing Party’s right to seek
recourse against Receiving Party will include, without limitation thereto, the right to obtain injunctive relief. 
 7. Indemnification

 7.1 By Greenfield. Greenfield will indemnify, defend, and hold ChemRock and its members, owners, officers,
directors, employees, and agents and their respective successors and assigns harmless from and against all damages actually suffered, incurred, or realized by ChemRock caused by, arising out of, or resulting from: (i) any misrepresentation,
breach of warranty, or breach or default of any covenant or agreement made or undertaken by Green Field in this Agreement; and (ii) injuries or damages of whatsoever kind, or by whosoever caused, to any person or entity or the property of any
person or entity caused by, arising out of, or resulting from Green Field’s sale or other use of any of the Products, or activities undertaken by Greenfield in connection with this Agreement, except for injuries or damages that are proved to
have been directly caused by or resulting from a breach by ChemRock of the limited warranties set forth in Section 2.3, above. These obligations will survive the termination of this Agreement. 

7.2 By ChemRock. ChemRock will indemnify, defend, and hold Green Field and its members, owners, officers, directors, employees,
and agents and their respective successors and assigns harmless from and against all damages actually suffered, incurred, or realized by Green Field caused by, arising out of, or resulting from: (i) any misrepresentation, breach of warranty, or
breach or default of any covenant or agreement made or undertaken by ChemRock in this Agreement; and (ii) injuries or damages to any person or entity or the property of any person or entity, but only to the extent that the
injuries or damages are proved to have been directly caused by or resulting from a breach by ChemRock of the limited warranties set forth in Section 2.3, above. These obligations will survive the termination of this Agreement. 

 
 *** Certain information in this document has been omitted and filed
separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
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 7.3 Definition of Damages. For purposes of this Agreement, “damages” means
any and all liabilities, losses, damages, demands, assessments, claims, costs and expenses, whether known or unknown, now existing or hereafter arising, contingent or liquidated, including interest, awards, judgments, penalties, settlements, fines,
costs of remediation, diminutions in value, costs and expenses incurred in connection with investigating and defending any claims or causes of action, including, without limitation, attorneys’ fees and expenses and all fees and expenses of
consultants and other professionals. Notwithstanding the foregoing, however, the term “damages” will not include, and neither party will be obligated to pay or indemnify the other party for, damages that are unforeseeable, speculative, or
consequential. 
 8. Arbitration of Disputes 
 Except as otherwise provided in this Agreement, if any dispute arises under this Agreement, it will be settled by binding arbitration in accordance with the provisions of this Section 8. Arbitration
proceedings will be conducted in Lafayette, Louisiana before a single arbitrator selected by the parties using the Commercial Arbitration Rules of the American Arbitration Association (“AAA”) then in effect, but the matter will not be
submitted to AAA for administration. In the event of a conflict between this provision and the Commercial Arbitration Rules of the American Arbitration Association, this provision will govern. Any party may compel arbitration by giving notice to the
other parties. If the parties cannot agree on the identity of a single arbitrator within 15 days after delivery of the arbitration notice, each of them will appoint one arbitrator and the party-appointed arbitrators will appoint, within ten days of
the appointment of the last to be appointed, an arbitrator, who will serve as the sole arbitrator. If a party fails to timely appoint an arbitrator, that party will be deemed to have waived its right to appoint an arbitrator and the arbitrator will
be appointed by the arbitrators appointed by the other parties. If the party-appointed arbitrators fail to appoint the sole arbitrator within the time provided, then the sole arbitrator will be appointed by the chief judge of the 15th Judicial
District Court in Lafayette, Louisiana sitting at the time. No arbitrator (including the arbitrators who may be appointed by the parties in the dispute) will be related to or affiliated with, or have represented in a legal capacity, any party. The
arbitrator will establish a schedule for the proceedings that will include a discovery period not to exceed 60 days, and will issue a final decision in writing. The arbitrator will have full authority to render any ruling in law or in equity,
including without limitation, equitable remedies and specific performance of any obligation under this Agreement. The decision of the arbitrator will be final and binding on the parties and may be enforced in any court having jurisdiction. Each
party will advance an equal share of the arbitrator’s fees and the administrative fees of arbitration. But the arbitrator will award to the prevailing party or parties all of the prevailing party or parties’ costs and attorney fees.

 The parties acknowledge that a breach of or a default under any of the terms and conditions of this Agreement may, in some
cases, result in irreparable harm, and in such case, any remedies that the parties may have at law may be insufficient. Accordingly, the parties agree that in the case of a breach or default that could cause irreparable harm, nothing contained in
this Section 8 will deny the aggrieved party of the right to seek injunctive relief in any court having jurisdiction. 
 9. Notices

 All notices, demands, or other communications to be given or delivered under or by reason of the provisions of this
Agreement will be in writing and will be deemed to have been given when delivered personally to the recipient, or when sent to the recipient by fax (receipt confirmed), or by e-mail (receipt confirmed) or one business day after the date when sent to
the recipient by reputable, express courier service (charges prepaid), or two business days after the date when mailed to the recipient by certified or registered mail return receipt requested and postage prepaid, and delivered or sent to the
addresses, fax numbers, or e-mail addresses set forth below: 
  
 ***
Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 6 

	 	If to ChemRock:	ChemRock Technologies, L.L.C. 

P.O. Box 81277 

Lafayette, Louisiana 70598 
 Attention: David O. Trahan, Director 
 Fax Number: (337) 291-2781 

E-Mail: dtrahan@chemrocktech.com 
  

	 	If to Green Field:	Green Field Energy Services, L.L.C. 

 4023 Ambassador Caffery Parkway, Suite 200 
 Lafayette, Louisiana 70503

 Attention: Virgil Vincent, Vice-President 
 Fax Number: (337) 984-3868 
 E-Mail: virgil.vincent@gfesmail.com 

A party may change its address for notices by giving the other party written notice of the change in the manner for giving notices set
forth above. 
 10. Assignment 
 Neither this Agreement nor any right, interest, or obligation hereunder may be assigned or assignable by either party in whole or in part without the prior written consent of the other party, except
(i) to a party’s parent, subsidiary, or affiliated company, or (ii) to an entity into which the party is merged or that otherwise acquires all or substantially all of the party’s assets. This provision will not be construed to
prohibit ChemRock from assigning or transferring its rights to receive payments from Green Field under this Agreement to its bank or other financial institution. ChemRock will give Green Field prompt notice of any such assignment or transfer.

 11. Force Majeure 
 Neither party will be responsible for failure or delay due to causes beyond its control in performing under this Agreement, except for the obligation of a party to make payments hereunder. These causes
will include, but not be restricted to, fire, storm, flood, earthquake, explosion, accident, acts of any public enemy, war, rebellion, insurrection, sabotage, terrorism, epidemic, quarantine restrictions, transportation embargoes, or failures or
delay in transportation, fuel or energy shortages, power interruptions or failures, acts of God, acts, rules, regulations, orders or directives of any government or political subdivision, agency or instrumentally thereof, or the order of any court,
regulatory, or arbitral body of competent jurisdiction. The non-performing party will give prompt written notice to the other party of the reason for its failure or inability to perform and the extent and expected duration of its inability to
perform. Upon cessation of such situation, the non-performing party will resume performance hereunder. 
 12. General Provisions

 12.1 Applicable Law. This Agreement will be governed by Louisiana law, without regard to its choice-of-law
provisions. 
 12.2 Jurisdiction and Venue. Subject to the arbitration provision set forth above, each party agrees to
submit to the personal jurisdiction and venue of the state and federal courts in Lafayette, Louisiana, and waives all questions of personal jurisdiction and venue, including, without limitation, the claim or defense that those courts constitute an
inconvenient forum. 
  
 *** Certain information in this document has
been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 7 

 12.3 Expenses of Enforcement. In the event of a dispute or claim under or arising out
of this Agreement, the prevailing party will be entitled to collect from the unsuccessful party all costs and expenses, including reasonable attorney’s fees, incurred by the prevailing party. 

12.4 Default; Limitations on Damages. If a party breaches this Agreement, the other party may exercise any and all remedies
available to the party under this Agreement and applicable law, including but not limited to the right to pursue a claim for damages and the right to compel specific performance. Notwithstanding the foregoing, however, neither party will be
obligated to pay the other party damages that are unforeseeable, speculative, or consequential. 
 12.5 Severability. If
any part of this Agreement is held to be indefinite, invalid, or otherwise unenforceable, the rest of the Agreement will continue in full force. 
 12.6 Binding Effect. This Agreement is binding on the parties and their heirs, successors, and assigns. 
 12.7 Best Efforts and Further Assurances. Subject to the terms and conditions of this Agreement, each of the parties agrees to use its best efforts to take, or cause to be taken, all actions, and
to do, or cause to be done, all things necessary, proper, or advisable under applicable laws and regulations to consummate and make effective the transactions contemplated by this Agreement. 

12.8 Survival. All representations, warranties, agreements, indemnities, and obligations made or undertaken by a party to this
Agreement are material, have been relied upon the other parties, and will survive closing for the maximum period allowed by law. 
 12.9 Counterparts. This Agreement may be executed in multiple counterparts, each of which is considered an original, and all of which, together, will constitute one and the same agreement.

 12.10 Exhibits. All exhibits and schedules attached to this Agreement are fully incorporated into this Agreement.

 12.11 Entire Agreement; Amendments. This Agreement and the exhibits and schedules attached hereto constitute the final
expression of agreement between the parties with respect to the subject matter hereof, and is a complete and exclusive statement of the terms and conditions of their relationship, and there are no other agreements or understandings, written or oral,
between the parties with respect thereto. This Agreement supersedes all previous negotiations, discussions, and commitments with respect to the subject matter hereof. The parties agree that the terms of this Agreement will exclusively control the
terms and conditions under which ChemRock will supply Products to Green Field and further agree that no purchase order, order form, invoice, or other document issued prior or subsequent to the date of this Agreement will be deemed to supplement,
modify, or amend the terms and conditions hereof unless the document is signed by both parties and expressly and unambiguously indicates that it is an amendment of this Agreement. This Agreement may be amended only by a written instrument duly
executed by the parties, and any condition to a party’s obligation hereunder may only be waived in writing by the other party. 
 12.12 Waiver. A party’s waiver of enforcement of any of this Agreement’s terms or conditions will be effective only if in writing. A party’s specific waiver will not constitute a
waiver by that party of any earlier, concurrent, or later breach or default. 
 12.13 No Third Party Beneficiaries. This
Agreement will not confer any rights or remedies on any person other than ChemRock and Green Field and their respective successors and permitted assigns. 
  

*** Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has
been requested with respect to the omitted portions. 

  
 8 

 12.14 No Agency or Partnership. Nothing contained in this Agreement will be deemed or
construed to create a relationship of principal and agent or of partnership or of joint venture or of any association whatsoever between or among the parties. 

 
  
 *** Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions.

  
 9 

 IN WITNESS WHEREOF, the parties have executed this Agreement on this 10th day of February,
2012. 
  

							
	WITNESSES:	 		 		 	CHEMROCK TECHNOLOGIES, L.L.C.
				
	 /s/ Earl J. Blackwell
	 		 	By:	 	 /s/ David O. Trahan

		 		 		 	 David O. Trahan
 (type or
print name)

			
	/s/ Mary V Blasingane	 		 	Its: Director

 IN WITNESS WHEREOF, the parties have executed this Agreement on this
            day of February, 2012. 
  

							
	WITNESSES:	 		 		 	GREEN FIELD ENERGY SERVICES, INC.
				
	 /s/ Earl J. Blackwell
	 		 	By:	 	 /s/ Virgil K. Vincent

		 		 		 	 Virgil K. Vincent
 (type or
print name)

			
	 /s/ Mary V Blasingane
	 		 	Its: Vice President

  
 *** Certain information in this document has
been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 10 

 Schedule A 
 List of Products 
  

					
	 Product Group
	  	 Margin &/or Markup Unit
	  	 Comment

	 Friction Reducers
	  	[***]	  	
	 Gelling Agents
	  	[***]	  	
	 Gel Crosslinkers
	  	[***]	  	
	 Gel Breakers
	  	[***]	  	
	 Scale Inhibitors
	  	[***]	  	
	 Surfactants
	  	[***]	  	
	 Buffers
	  	[***]	  	
	 Corrosion Inhibitors
	  	[***]	  	
	 Clay Stabilizers
	  	[***]	  	
	 Iron Control Agents
	  	[***]	  	
	 MicroEmulsions
	  	[***]	  	
	 Gel Stabilizers
	  	[***]	  	
	 Divert Agents / Fluid Loss Agents
	  	[***]	  	
	 Foaming Agents
	  	[***]	  	
	 Defoaming Agents
	  	[***]	  	
	 Guar Gum Powder
	  	[***]	  	* Supply lead time 45 days
	 Guar Gum Slurry
	  	[***]	  	* Supply lead time 60 days
	 Paraffin Control
	  	[***]	  	
	 Acid Inhibitors
	  	[***]	  	
	 Biocides
	  	[***]	  	
	 Non-Emulsifiers
	  	[***]	  	
	 Flow Back Enhancers
	  	[***]	  	

 Note 1: Cost = cost of material to ChemRock less any freight, handling or additional overhead handling charges.

  
 *** Certain information in this document has been omitted and
filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 11Plant Construction Reimbursement and Sales Agreement

 Exhibit 10.15 
 CERTAIN MATERIAL (INDICATED BY AN ASTERISK) HAS BEEN OMITTED FROM THIS DOCUMENT PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION. 
 PLANT CONSTRUCTION REIMBURSEMENT AND 

SALES AGREEMENT BETWEEN 
 GREAT NORTHERN SAND LLC 
 AND 

GREEN FIELD ENERGY SERVICES, L.L.C. 
 This Agreement is entered into as of October 28, 2011 (“Effective Date”) by and between Green Field Energy Services, L.L.C. (“Buyer”) and Great Northern Sand LLC
(“Seller”). 
  

	1.	Seller will sell to Buyer, and Buyer will purchase from Seller, northern white grade 20/40 frac sand, northern white grade 30/50 and northern white grade 40/70 sand
(the “Material”), in the volumes, at the prices, and on the delivery terms set forth below. The Material will conform to Seller’s standard specifications, which conform to API Specification 56, or such other specifications as may
be established by written agreement of the parties. As used herein, “short ton” and “ton” are both defined to mean a total weight of 2,000 lbs. 

 

											
	Buyer Locations	  	Seller Plant	  	“Yearly Volume” of Material
each “Contract Year”	  	Packaging	  	 Price Per
 Short Ton
	  	 Delivery
 Terms

	 Buyer’s
 U.S.
 facilities
	  	 Plant located
 on Union
 Pacific

Connector
 Railroad
in
 Wisconsin
	  	 [***] short tons of northern
white sand 20/40

 
 [***] short tons of northern
white
sand 30/50
  

[***] short tons of northern
white sand 40/70
	  	bulk	  	 See
 attached
 Exhibit B
	  	 F.O.B.
 Seller
 Plant

 

	2.	(a) Seller will use commercially reasonable efforts to construct a new plant (“New Plant”) located in Wisconsin and have it commissioned and operating as
intended by Seller, all as determined by Seller, on or before July 1, 2012 

 (b) For purposes of this
Agreement, the term “Contract Year” shall mean the period of twelve consecutive calendar months beginning on July 1, 2012, and each of the three (3) successive periods of twelve calendar months occurring immediately thereafter
ending June 30, 2016. 
 ***  Certain information on this page has been omitted and filed separately with the Securities and
Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

 (c) Subject to subsection 2(e) below, during each Contract Year, Buyer will purchase
from Seller, and Seller will sell to Buyer, an amount of Material equal to the Yearly Volume as set forth above. Buyer will order Material hereunder from Seller in generally even monthly proportions. Subject to the availability of sufficient
railcars, shipments of Material purchased and sold hereunder will be scheduled in reasonably equal monthly proportions. Provided that Buyer orders Material from Seller in generally even monthly proportions, the Yearly Volume shall be reduced on a
pro rata basis for the subject Contract Year to the extent that Seller is unable to provide an uninterrupted supply of Material due to the unavailability of sufficient railcars. 

(d) In the event that the date the New Plant is commissioned and operating as intended by Seller, all as determined by Seller, occurs
after July 1, 2012, then (i) the term of this Agreement during which Buyer is required to purchase from Seller, and Seller required to sell to Buyer, Material shall be shortened by one (1) calendar month for each calendar month, or
each part of an incomplete calendar month exceeding fifteen (15) days, occurring between July 1, 2012 and the date the New Plant is commissioned and operating as intended by Seller; and (ii) the Yearly Volume shall be reduced on a pro
rata basis with respect to any affected Contract Year for the purpose of determining the liquidated damages described in Section 4 below 
  

	3.	An advance payment (“Advance Payment”) of [***] per ton for each ton produced under this Agreement ([***] total) shall be paid on the following schedule:

 (a) [***]) on or before November 15, 2011 

(b) [***]) on February 1, 2011 

(c) [***]) on April 1, 2012 
 (d) [***]) on commissioning and operations of the Plant and shipping rail car to Buyer, or if Buyer does not request shipment of product, Seller’s demonstrated ability to ship a rail car to Buyer.

 For purposes of illustration, if the yearly commitment was for [***] tons per year, then the total commitment under the
Agreement would be for [***] tons total. The total Advance Payment for this scenario would be [***] and each of these [***] payments would be [***]. The total Advance Payment would be rebated at a credited rate of [***] per ton against the price per
ton in effect at the time for the first 899,820 tons of Material actually ordered, shipped, and invoiced to the Buyer. 
  

	4.	(a) In the event that Buyer fails to purchase the Yearly Volume of Material from Seller during any Contract Year, Buyer shall either: 

 

	 	(i)	Pay to Seller within thirty days of the end of such Contract Year, as liquidated damages (“Liquidated Damages”), an amount equal to [***] multiplied by the
amount by which the Yearly Volume exceeds the short tons of such Material that Buyer actually purchased from Seller hereunder during that Contract Year (“Shortfall Volume”); or 

***  Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment
has been requested with respect to the omitted portions. 

  
 2 

	 	(ii)	Inform Seller that Buyer wishes to increase the Yearly Volume commitment for the following year by an amount no greater than ten percent (10%) of the Yearly Volume
(maximum “Rollover Volume” equals Yearly Volume times 10%) and Buyer shall pay to Seller within thirty days of the end of such subsequent Contract Year, as Liquidated Damages, an amount equal to [***]/ton multiplied by the amount in short
tons by which the Shortfall Volume exceeds the Rollover Volume. For purposes of illustration, if Buyer were to have an Annual Volume of 300,000 tons, and did not purchase 45,000 tons of the Annual Volume in a Contract Year, then the
Rollover Volume would be 30,000 tons, making the subsequent Contract Year Annual Volume equal to 330,000 tons, and Buyer would owe Seller liquidated damages on 15,000 tons (15,000 times [***] per ton equals [***]).

 (b) In either case of choice above of (i) or (ii) above of this section 4(a), Buyer will have
the opportunity to recover the Liquidated Damages paid by increasing the total volume of Material under this Agreement by the same volume as the Liquidated Damages is calculated on (“Extension Volume”). This increased volume will have the
effect of extending the termination date will by a number of days equal to the Extension Volume firstly being divided by the Yearly Volume and then secondly multiplying that result by 365 and then thirdly rounding the answer upward to the next whole
day. For purposes of illustration, if the Extension Volume was 30,000 tons and the Yearly Volume was 300,000 tons, the termination date would be extended by the calculation (30,000/300,000)*365 = 36.5, which is then rounded upward to
37 days. 
 Subject to (iii) below, when the total volume of Material under this Agreement is increased by an amount
equal to the Extension Volume, the total Liquidated Damages will be credited back to Buyer by making a credit of [***] per ton against the price per ton for the Material in effect at that time until these cumulative credits have rebated the
Liquidated Damages in full. 
  

	 	(iii)	Following payment of Liquidated Damages, the credit for recovery of the Liquidated Damages actually paid will begin when additional Material is subsequently and
actually ordered, shipped and invoiced to Buyer; except that, if the Advance Payment has not yet been fully rebated, the credit for recovery of the Liquidated Damages actually paid will begin immediately after the Advance Payment has been rebated in
full and then additional Material is subsequently and actually ordered, shipped and invoiced to Buyer. 

 (c) The
parties acknowledge and agree that: (i) at Buyer’s request and in reliance upon Buyer’s projected requirements for Material which are reflected in Buyer’s purchasing obligations hereunder, Seller will maintain the operating mode
of the Seller Plants and Seller will spend substantial capital funds to construct the New Plant so as to enable Seller to supply each Yearly Volume of Material as provided in this Agreement; (ii) the payment of liquidated damages as provided in
this Section 4 is reasonable as a forecast of anticipated actual harm which would be caused by Buyer’s breach of its purchase 

***  Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment
has been requested with respect to the omitted portions. 

  
 3 

 
obligations under this Agreement; (iii) such liquidated damages are not unreasonably large or in the nature of or the magnitude of a penalty; (iv) actual damages would be difficult to
compute in the event of such a breach by Buyer; and, (v) obtaining an adequate remedy other than such liquidated damages would be inconvenient and not feasible. Seller recognizes that the liquidated damages provisions set forth in this
Section 4 are Seller’s sole and exclusive remedy in the event Buyer fails for any reason, including but not limited to the failure of the parties to agree on the price (as provided in the attached Exhibit B) of the Material in any
Contract Year, to purchase any or all of each Yearly Volume of Material as provided in this Agreement. 
  

	5.	If during the term of this Agreement Buyer wishes to switch a portion of the Buyer’s committed volume of one product size to another product size, Seller will
allow Buyer to adjust the relative proportions of the various product sizes being ordered to match the actual proportions being produced by the mine throughout the duration of the Agreement. Regardless of such an adjustment, Buyer agrees that the
total yearly commitment of all product sizes will be unchanged. 

  

	6.	Payment terms for Material and surcharges, if any, and excluding any associated with “freight prepaid” charges, are net thirty (30) days and all sales
are subject to Seller’s Terms and Conditions of Sale, a copy of which is attached to this Agreement as Exhibit A. In the event of any conflict between the terms set forth in the body of this Agreement and Exhibit A, the terms set
forth in the body of this Agreement will control. 

  

	7.	The parties will hold the terms of this Agreement in confidence provided that parties may disclose to their financial institutions, financial advisors, lawyers and
accountants. 

  

	8.	 The term of this Agreement will begin as of the Effective Date and will expire on the last day of the fourth (4th) Contract Year (June 30, 2016), unless sooner terminated
as provided herein. 

  

	9.	This Agreement, including the attached Exhibits A and B, represents the entire agreement and understanding between Seller and Buyer regarding the subject matter
hereof with respect to any time period during or after the first Contract Year and replaces all prior agreements, oral or written, regarding the same. The rights and obligations of Buyer under this Agreement may not be assigned or delegated, in
whole or in part, without the prior written consent of Seller. Any attempted assignment contrary to the provisions of this Section 8 shall be of no force and effect. 

 

	10.	This Agreement may only be amended by a written agreement signed by both Seller and Buyer. Buyer may from time to time issue a purchase order, release or other similar
transactional form or document. These forms and documents will be issued solely for the administrative convenience of the issuer and will not modify or amend this Agreement. 

 

	11.	It is expressly agreed and understood that the relationship between the parties to this Agreement is that of seller and buyer. This Agreement shall not create any
partnership, joint-venture or similar arrangement nor any agency or employer-employee relationship between the parties to this Agreement. 

 ***  Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted
portions. 

  
 4 

									
	Seller:	 		 	 Buyer:

			
	Great Northern Sand LLC	 		 	 Green Field Energy Services, INC.
 a Delaware Corporation

					
	By:	 	/s/ Barry Ekstrand	 		 		 	
		 	(signature)	 		 	By:	 	/s/ Virgil K. Vincent
	Name:	 	Barry Ekstrand	 		 	Name:	 	Virgil Vincent
	Title:	 	President	 		 	Title:	 	Vice President

 ***  Certain information on this page has been omitted and filed separately with the Securities and Exchange
Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 5 

 Exhibit A 

Great Northern Sand LLC Terms and Conditions of Sales 

 

	1.	Prices: Unless otherwise noted on Seller’s invoice or in the Bill of Lading, all prices are net F.O.B. Seller’s plant and are exclusive of any sales, use or
property taxes. Any clerical errors are subject to correction. 

  

	2.	Warranty: Except as is furnished herein in writing by Seller to Buyer, Seller warrants solely to Buyer only that materials furnished hereunder will be of the kind
designated or specified, and no other warranty, except of title, shall be implied. Providing Buyer gives notice in accordance with Article 11, if goods sold hereunder contain defects in material or workmanship demonstrated to Seller’s
satisfaction to have existed at the time of departure from Seller’s plant, Seller, reserving the right to either inspect them in Buyer’s hands or request their return will, at Seller’s option, correct or replace at Seller’s
expense F.O.B. Seller’s plant, or give Buyer proper credit for such goods determined by Seller to defective, with all necessary packaging and transportation costs (if any) to be assumed by Buyer. The foregoing shall not apply to goods that
shall have been subjected to alteration, contamination, improper maintenance or storage, misapplication, misuse, negligence or accident after shipment from Seller’s plant by anyone except Seller’s authorized employees or to goods to which
Buyer’s tests use an unrepresentative sample. 

 EXCEPT AS SET FORTH ON FACE OF SELLER’S INVOICE OR ON
THE BILL OF LADING, ALL WARRANTIES OF MATERIALS SOLD HEREUNDER, EXPRESSED OR IMPLIED, INCLUDING BUT NOTLIMITED TO WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE SPECIFICALLY EXCLUDED FROM THIS TRANSACTION AND SHALL NOT APPLY.

 THE REMEDIES SET FORTH IN THIS ARTICLE 3 SHALL BE THE SOLE AND EXCLUSIVE REMEDY AVAILABLE TO THE BUYER, IN LIEU OF ALL
OTHER REMEDIES FOR DAMAGES (INCLUDING BUT NOT LIMITED TO DIRECT, CONSEQUENTIAL AND SPECIAL OR INCIDENTAL DAMAGE ARISING OUT OF LATE, PARTIAL AND/OR NON DELIVERY, THE SALE, USE, FURNISHING OF MATERIALS, OR SUITABILITY FOR GENERAL OR PARTICULAR USE).
IN NO EVENT WILL SELLER’S LIABILITY EXCEED THE CONTRACT (PURCHASE) PRICE FOR THE MATERIALS FOR WHICH LIABILITY IS CLAIMED. BUYER IS SOLELY RESPONSIBLE FOR DETERMINING SUITABILITY FOR USE AND SELLER SHALL IN NO EVENT BE LIABLE IN THIS RESPECT.
THE GIVING OR FAILURE TO GIVE ADVICE, RECOMMENDATION OR SAFETY WARNINGS OF ANY CHARACTER BY SELLER SHALL NOT IMPOSE ANY LIABILITY UPON SELLER. 
 If the materials sold hereunder are resold by Buyer, Buyer agrees to include in the contract for resale provisions which limit recoveries against Seller in accordance with this Article 3. No employee
or agent of Seller is authorized to 

 make any warranty statement, promise or understanding other than that which is
specifically set forth herein. The provisions in any specification data sheet or chart issued by Seller or attached hereto are descriptive only and are not warranties or representations. 

 

	3.	Safety Warning, Handling and Buyer Indemnity: PROLONGED INHALATION OF AIRBORNE SILICA CONTAINED IN SILICA SAND AND OTHER SILICA CONTAINING MATERIALS CAN CAUSE
RESPIRATORY DISEASE INCLUDING SILICOSIS, A PROGRESSIVE, INCAPACITATING AND SOMETIMES FATAL DISEASE OF THE LUNGS. IARC HAS DETERMINED THAT CRYSTALLINE (WHICH INCLUDES (MICROCRYSTALLINE) SILICA INHALED FROM OCCUPATIONAL SOURCES CAN CAUSE CANCER IN
HUMANS. THE RISK OF LUNG DISEASE IS INCREASED IF SMOKING IS COMBINED WITH SILICA RESPIRATION. 

 PROPER
RESPIRATORY PROTECTION, SILICA DUST PREVENTION AND APPLICABLE HEALTH AND SAFETY REGULATORY PROTOCOL MUST BE STRICTLY OBSERVED AT ALL TIMES WHEN HANDLING SILICA BASED MATERIALS TO MINIMIZE RISK OF INJURY DUE TO INHALATION OF AIRBORNE SILICA.

 SELLER WILL NOT BE LIABLE TO BUYER FOR ANY HARMFUL HEALTH EFFECTS WHICH MAY BE CAUSED BY EXPOSURE TO SILICA CONTAINING
MATERIALS SOLD BY SELLER. Buyer warrants that it will adequately warn all of its employees and customers who may come in contact with Seller’s silica containing materials of the above described health hazards. Further, Buyer warrants it will
fully comply with all applicable health and safety regulations and orders relating to the workplace handling of Seller’s goods. Buyer agrees that if the goods sold hereunder are resold by Buyer, Buyer will include in its contract for resale,
provisions which include the full substance those contained in this Article 4, including the foregoing safety warning. 

Should Buyer breach any of the duties and warranties set forth within this Article 4, BUYER AGREES TO FULLY INDEMNIFY, DEFEND
ANDHOLD SELLER HARMLESS from and against any and all liability, claims, and suits of any third party including but not limited to employees or insurers of Buyer, in any way, in whole or in part, alleged to have arisen out of exposure to the
Seller’s silica containing materials which are the subject to these Terms. 
  

	4.	Credit and Payments: Unless noted otherwise on Seller’s invoice and/or on the Bill of Lading, payment shall be made net thirty (30) days after shipment date.
Seller reserves the right at any time to alter or suspend credit, or to change credit terms provided herein, when in its sole opinion Buyer’s financial condition so warrants. (Failure to pay an invoice at due date, at Seller’s election,
makes all subsequent invoices immediately due and payable, irrespective of terms and Seller 

 

  
 ***  Certain information on
this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 6 

 
may withhold all subsequent deliveries under all outstanding orders until full payment is received). In the event of insolvency of Buyer, default in payment or repudiation by Buyer, or any breach
of the terms of this agreement, Seller shall have the right to stop delivery of the goods and the Buyer shall be liable to Seller for any and all liabilities incurred by Seller as a result thereof including, but not limited to liabilities to third
parties, collection costs, attorneys’ fees, and any associated costs incurred by Seller. 
  

	5.	Delivery: Delivery and shipment dates are estimated dates only and are not guaranteed. In estimating such dates, no allowance has been made nor shall Seller be liable
for any damages, losses, penalties, whether direct, indirect, special, incidental or consequential, resulting from Seller’s failure or delay in performing, or for delays of carriers or delays from labor difficulties, Y2K-related computer error,
shortages, strikes or stoppages of any sort, fires, accidents, failure or delay in obtaining materials or in Seller’s mining and processing facility, acts of government affecting Seller directly or indirectly, bad weather, or any causes beyond
Seller’s control or causes designated Acts of God or force majeure by any statute or court of law. 

  

	6.	Shipping: Unless Buyer specifies otherwise in writing, (a) materials will be shipped as Seller may deem proper, and (b) routing and manner of shipment will be
at Seller’s discretion. If special routing instructions are given, Buyer agrees to pay additional handling and transportation charges, if any. 

  

	7.	Termination: Seller may by written notice to Buyer terminate the whole or any part of this contract in any one of the following circumstances: (1) if Buyer fails
to remit payment within the time specified herein or any authorized extension thereof; or (2) if Buyer fails to perform any of the other provisions of this contract after written notice to Buyer

	 	
of such failure and Buyer’s failure to cure the same within thirty (30) days after receipt of such written notice; or (3) if Buyer becomes insolvent, or engages in any act which
reasonably causes the Seller to deem itself insecure. Seller shall not by reason of such termination be liable to Buyer for any compensation, reimbursement, or damages including, in particular, but not limited to any direct, indirect, special,
incidental or consequential damages or losses whatsoever, on account of expenditures, investments, or commitments. 

  

	8.	Assignment: The rights and obligations of Buyer hereunder may not be assigned without the prior written consent of Seller. 

 

	9.	Non-Waiver: Any failure by either party to require full payment or strict performance by the other party of any of the provisions herein or to exercise any right or
remedy hereunder, shall not waive or diminish such party’s right thereafter to demand strict compliance therewith or with any other provision or to exercise any such right or remedy. Waiver of any default shall not waive any other default.

  

	10.	Applicable Law: This agreement shall be governed by and construed under the laws of the State of Texas, U.S.A. 

 

	11.	Claims: It shall be the duty of Buyer to thoroughly inspect the materials purchased from Seller. All claims of any nature relating to the materials subject to this
order including but not limited to claims of defect in materials, nonconforming discrepancy in quantity or delivery date shall be made in writing to Seller’s Customer Service Department within fifteen (15) days of receipt of goods by
Buyer. Failure to make any such written claim within the above-prescribed period shall constitute waiver of any such claims and shall be deemed acceptance of such materials, quantities or delivery dates.

 

 ***  Certain information on this page has been omitted and filed separately with the Securities
and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 7 

 EXHIBIT A 

Great Northern Sand LLC Agreement 
 ***  Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted
portions. 

  
 8 

 Exhibit B 

Pricing 
  

			
	- First Contract Year:	  	Price for First Contract Year shall be as follows:
		  	        Northern White Grade [***]
		  	        Northern White Grade [***]
		  	        Northern White Grade [***]
		
		  	In addition, any “freight prepaid” prices shall include any freight and terminal costs then in effect and shall be subject to freight and terminal increases as they
occur.*
		
	 - Second Contract Year:
	  	Material prices to be agreed in writing by the parties; provided that, excluding any freight and terminal costs, the material price increase or price decrease for each product
over that in effect during the immediately preceding Contract Year shall be no more than [***] in either case. In addition, any “freight prepaid” prices shall include any freight and terminal costs then in effect and shall be subject to
freight and terminal increases as they occur.*
		
	 - Third Contract Year:
	  	Material prices to be agreed in writing by the parties; provided that, excluding any freight and terminal costs, the material price increase or price decrease for each product
over that in effect during the immediately preceding Contract Year shall be no more than [***] in either case. In addition, any “freight prepaid” prices shall include any freight and terminal costs then in effect and shall be subject to
freight and terminal increases as they occur.*
		
	 -Fourth Contract Year:
	  	Material prices to be agreed in writing by the parties; provided that, excluding any freight and terminal costs, the material price increase or price decrease for each product
over that in effect during the immediately preceding Contract Year shall be no more than [***] in either case. In addition, any “freight prepaid” prices shall include any freight and terminal costs then in effect and shall be subject to
freight and terminal increases as they occur.*

 Failure of the parties to agree on the applicable price for any Contract Year as set forth above will have the effect of
extending the price in effect during the immediately preceding Contract Year. 
 In addition, Buyer will pay such production based energy
surcharge, if any, as may be imposed from time to time by Seller. Any such energy surcharge will be added to invoices as a separate line item. 

*** Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been
requested with respect to the omitted portions. 

  
 9 

 * Regardless of the delivery terms indicated, risk of loss will pass to Buyer when Material is delivered to
the applicable carrier at the Seller Plant. With respect to any “freight prepaid” pricing, as a convenience for Buyer, Seller will, on Buyer’s behalf, make arrangements and prepay the transportation costs assessed by carriers to have
the Material shipped from the applicable Seller Plant to the applicable Buyer plant, either directly or indirectly via a terminal. Any such “freight prepaid” charges will be invoiced separately from Material invoices. Seller will not incur
any liability in the event of any delay or failure of carriers to perform transportation services. Buyer will be responsible for filing any claims with carriers. Transportation costs are subject to changes in base freight rates as well as the
applicability of surcharges. When surcharges are assessed, or when freight rates or surcharges are increased, by the carrier, Seller will change the then “freight prepaid” price by the same amount. Any such change will become effective on
the date implemented by the carrier. Transportation surcharges, if any, will be added to invoices as separate line items and paid by Buyer. Payment terms for any “freight prepaid” charges are net fifteen (15) days. 

***  Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment
has been requested with respect to the omitted portions. 

  
 10 

 SECURITY AGREEMENT—MEMBERSHIP INTERESTS 

CRS PROPPANTS LLC, a Delaware limited liability company (“CRS”), whose address is 777 Post Oak Boulevard
Suite 250, Houston, Texas 77056, and GREEN FIELD ENERGY SERVICES, INC., a Delaware corporation (“Secured Party”), whose address is 4023 Ambassador Caffery, Lafayette, LA., agree as follows: 

RECITALS 

A. CRS and Secured Party have entered into that certain Plant Construction Reimbursement and Sales Agreement dated substantially
concurrently herewith (the “Sales Agreement”) pursuant to which Secured Party has agreed to pay the Advance Payment (as defined in the Sales Agreement) to CRS as an advance payment of [***] per ton for the first [***] tons of
Material (as defined in the Sales Agreement) required to be purchased by Secured Party each year under the Sales Agreement, and CRS has agreed to credit the Advance Payment against the purchase price for the first [***] tons per year of
Material actually ordered, shipped and invoiced to Secured Party, as more fully provided in the Sales Agreement. 
 B. In order
to secure the credit of the Advance Payment against the purchase price for the first [***] tons of Material required to be purchased by Secured Party each year under the Sales Agreement, Secured Party has requested that CRS grant Secured Party
a security interest in the Membership Interests (as defined below) of GREAT NORTHERN SAND LLC, a Delaware limited liability company (the “Limited Liability Company”), and CRS has agreed to do so, all upon the terms and conditions
set forth herein. 
 ARTICLE 1 
 Creation of Security Interest 
 In order to secure the credit of the
Advance Payment against the purchase price for Material actually ordered, shipped and invoiced to Secured Party under the Sales Agreement, CRS hereby grants to Secured Party a security interest in and mortgages, assigns, transfers, delivers,
pledges, sets over and confirms to Secured Party all of CRS’s remedies, powers, privileges, rights, titles and interests of every kind and character now owned or hereafter acquired, created or arising (whether as a member or otherwise) in and
to 30% of the membership interests in the Limited Liability Company listed and described on Exhibit A, hereto attached and hereby made a part hereof (the “Membership Interests”), which Membership Interests were created
under and by virtue of the Limited Liability Company Agreement dated effective as of June 24, 2010 (as amended, the “Limited Liability Company Agreement”), together with all accessions, appurtenances and additions to and
substitutions for any of the foregoing and all products and proceeds of any of the foregoing. All of the properties and interests described in this Article are herein collectively called the “Collateral.” 

ARTICLE 2 

Secured Credit 
 2.1 This Agreement is made to secure a credit of the Advance Payment against the purchase price for Material purchased by Secured Party each year under the Sales Agreement. 

***  Certain information on this page has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment
has been requested with respect to the omitted portions. 

 2.2 Each time CRS credits the Advance Payment against the purchase price Material purchased
by Secured Party each year under the Sales Agreement, the security interest on the Membership Interests pledged hereunder shall be automatically reduced by the proportionate amount that the Advance Payment has been reduced by the credit against the
purchase price Secured Party hereby authorizes and directs CRS to file UCC-3 financing statement amendments from time to time with the applicable Secretary of State releasing the Membership Interests that are no longer subject to this Agreement.

 ARTICLE 3 
 Representations and Warranties 
 CRS represents and warrants as follows:

 (a) CRS is the legal and equitable owner and holder of good and marketable title to the Collateral free of any adverse claim
and free of any security interest or encumbrance except only for the security interest granted hereby in the Collateral or as provided for in the LLC Agreement. 
 (b) CRS’s execution, delivery and performance of this Agreement does not and will not require any consent of any other person or entity. 

(c) Except as otherwise expressly permitted by this Agreement, the liens and security interests of this Agreement will constitute valid
and perfected first and prior liens and security interests on the Collateral, subject to no other liens, security interests or charges whatsoever. 
 (d) The Collateral is genuine, free from adverse claims or other security interests, defaults or defenses, and complies with applicable laws concerning form, content and manner of preparation and
execution. 
 ARTICLE 4 
 Covenants 
 4.1 CRS covenants and agrees with Secured Party as follows:

 (a) CRS shall furnish to Secured Party such instruments as may be required by Secured Party to assure the transferability of
the Collateral when and as often as may be requested by Secured Party. 
 (b) CRS will, on request of Secured Party,
(i) promptly correct any defect, error or omission which may be discovered in the contents of this Agreement or in any other instrument executed in connection herewith or in the execution or acknowledgment thereof; and (ii) execute,
acknowledge, deliver and record or file such further instruments (including further security agreements, financing statements and continuation statements) and do such further acts as may be necessary, desirable or proper to carry out more
effectively the purposes of this Agreement and such other instruments and to subject to the security interests hereof and thereof any property intended by the terms hereof and thereof to be covered hereby and thereby including specifically any
renewals, additions, substitutions, replacements or appurtenances to the then Collateral. 
 ***  Certain information on this page has
been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 2 

 ARTICLE 5 
 Events of Default 
 If CRS fails to credit the Advance Payment against the
purchase price for Material purchased by Secured Party each year under the Sales Agreement as required under the terms of the Sales Agreement, Secured Party shall send CRS written notice thereof and CRS shall have thirty (30) days after its
receipt of such notice to so credit the Advance Payment. If CRS fails to credit the Advance Payment within such thirty (30) day period, the same shall constitute an Event of Default (herein so called) under this Agreement. 

ARTICLE 6 Remedies in Event of Default 
 6.1 Upon the occurrence of an Event of Default, and at any time thereafter until such time, if any, as such Event of Default has been cured: 

(a) Secured Party may, without notice except as hereinafter provided, sell the Collateral or any part thereof at public or private sale
(with or without appraisal or having the Collateral at the place of sale) for cash, upon credit, or for future delivery, and at such price or prices as Secured Party may deem best, and Secured Party or any entity controlling the Secured Party may be
the purchaser of any and all of the Collateral so sold and may apply upon the purchase price therefore any of the Advance Payment that has not been credited in accordance with the Sales Agreement and thereafter hold the same absolutely free from any
right or claim of whatsoever kind. Secured Party is authorized at any such sale, if Secured Party deems it advisable or is required by applicable law so to do, (i) to restrict the prospective bidders on or purchasers of any of the Collateral to
a limited number of sophisticated investors who will represent and agree that they are purchasing for their own account for investment and not with a view to the distribution or resale of any of the Collateral, (ii) to cause to be placed on
certificates for any or all of the Collateral a legend to the effect that such security has not been registered under the Securities Act of 1933 and may not be disposed of in violation of the provisions of said Act, (iii) to disclaim and to
refuse to give any warranty, and (iv) to impose such other limitations or conditions in connection with any such sale as Secured Party deems necessary or advisable in order to comply with said Act or any other applicable law. CRS covenants and
agrees that it will execute and deliver such documents and take such other action as Secured Party deems necessary or advisable in order that any such sale may be made in compliance with applicable law. Upon any such sale Secured Party shall have
the right to deliver, assign and transfer to the purchaser thereof the Collateral so sold. Each purchaser at any such sale shall hold the property sold absolutely free from any claim or right of whatsoever kind, including any equity or right of
redemption, stay or appraisal which CRS has or may have under any rule of law or statute now existing or hereafter adopted. To the extent notice is required by applicable law, Secured Party shall give CRS written notice at the address set forth
herein (which shall satisfy any requirement of notice or reasonable notice in any applicable statute) of Secured Party’s intention to make any such public or private sale. Such notice (if any is required by applicable law) shall be personally
delivered or mailed, postage prepaid, at least ten (10) calendar days before the date fixed for a public sale, or at least ten (10) calendar days before the date after which the private sale or other disposition is to be made, unless the
Collateral is of a type customarily sold on a recognized market, is perishable or threatens to decline speedily in value. Such notice (if any is required by 
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portions. 

  
 3 

 
applicable law), in case of public sale, shall state the time and place fixed for such sale or, in case of private sale or other disposition other than a public sale, the time after which the
private sale or other such disposition is to be made. Any public sale shall be held at such time or times, within the ordinary business hours and at such place or places, as Secured Party may fix in the notice of such sale. At any sale the
Collateral may be sold in one lot as an entirety or in separate parcels as Secured Party may determine. Secured Party shall not be obligated to make any sale pursuant to any such notice. Secured Party may, without notice or publication, adjourn any
public or private sale or cause the same to be adjourned from time to time by announcement at any time and place fixed for the sale, and such sale may be made at any time or place to which the same may be so adjourned. In case of any sale of all or
any part of the Collateral on credit or for future delivery, the Collateral so sold may be retained by Secured Party until the selling price is paid by the purchaser thereof, but Secured Party shall incur no liability in case of the failure of such
purchaser to take up and pay for the Collateral so sold, and in case of any such failure, such Collateral may again be sold upon like notice. Each and every method of disposition described in this Section shall constitute disposition in a
commercially reasonable manner. 
 (b) Secured Party shall have all the rights of a secured party after default under the
Uniform Commercial Code of Texas. 
 6.2 All remedies herein expressly provided for are cumulative of any and all other remedies
existing at law or in equity, and the resort to any remedy provided for hereunder or provided for by law shall not prevent the concurrent or subsequent employment of any other appropriate remedy or remedies. 

ARTICLE 7 

Additional Agreements 
 7.1 Upon the full credit of the Advance Payment against the purchase price for Material purchased by Secured Party each year under the Sales Agreement, all rights under this Agreement shall terminate and
the Collateral shall become wholly clear of the security interest evidenced hereby, and upon written request by CRS such security interest shall be released by Secured Party in due form and at CRS’s cost. 

7.2 CRS will cause all financing statements and continuation statements relating hereto to be recorded, filed, re-recorded and refiled in
such manner and in such places as Secured Party shall reasonably request and will pay all such recording, filing, re-recording, and refiling taxes, fees and other charges. CRS hereby authorizes Secured Party to file all such financing statements and
to take such other measures as Secured Party may deem necessary or appropriate to perfect any security interests created hereunder in and to the Collateral. 
 7.3 This Agreement shall not be changed orally but shall be changed only by agreement in writing signed by CRS and Secured Party. No course of dealing between the parties, no usage of trade and no parole
or extrinsic evidence of any nature shall be used to supplement or modify any of the terms or provisions of this Agreement. 

7.4 Any notice, request or other communication required or permitted to be given hereunder shall be given in writing by delivering it
against receipt for it, by depositing it with an 
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the Securities and Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 14 

 
overnight delivery service or by depositing it in a receptacle maintained by the United States Postal Service, postage prepaid, registered or certified mail, return receipt requested, addressed
to the respective parties at the address set forth above (and if so given, shall be deemed given when mailed). Either party’s address for notice may be changed at any time and from time to time, but only after thirty (30) days’
advance written notice to the other party and shall be the most recent such address furnished in writing by such party. 
 7.5
This Agreement shall be binding upon CRS, and the heirs, devisees, executors, administrators, personal representatives, trustees, beneficiaries, conservators, receivers, successors and assigns of CRS, including all successors in interest of CRS in
and to all or any part of the Collateral, and shall benefit Secured Party and its successors and assigns. 
 7.6 Terms used in
this Agreement which are defined in the Texas Uniform Commercial Code are used with the meanings as therein defined. 
 7.7
THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE APPLICABLE LAWS OF THE STATE OF TEXAS AND THE UNITED STATES OF AMERICA FROM TIME TO TIME IN EFFECT. 

7.8 This Agreement and the Sales Agreement embody the entire agreement and understanding between Secured Party and CRS with respect to
their subject matter and supersede all prior conflicting or inconsistent agreements, consents and understandings relating to such subject matter. CRS acknowledges and agrees there is no oral agreement between CRS and Secured Party which has not been
incorporated in this Agreement and the Sales Agreement. 
 EXECUTED as of the 28th day of October, 2011. 

 

			
	CRS:
	
	 CRS PROPPANTS LLC,
 a Delaware limited liability company

		
	By:	 	/s/ Barry Ekstrand
	Name:	 	Barry Ekstrand
	Title:	 	President

  

			
	SECURED PARTY:
	
	 GREEN FIELD ENERGY SERVICES, INC. a
 Delaware corporation

		
	By:	 	/s/ Virgil K. Vincent
	Name:	 	Virgil Vincent
	Title:	 	Vice President

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Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

  
 5 

 LIMITED LIABILITY COMPANY AGREEMENT 

OF 

GREAT NORTHERN SAND LLC 
 (a Delaware Limited Liability Company) 
 This Limited Liability Company
Agreement (the “Agreement”) of Great Northern Sand LLC (the “Company”), dated effective as of June 24, 2010 (the “Effective Date”), is hereby adopted, executed and agreed to by the party listed
below as the sole Member. 
 1. Formation. The Company was formed on the Effective Date, as a Delaware limited
liability company under and pursuant to the Delaware Limited Liability Company Act, as amended (the “Act”). 

2. Term. The term of existence of the Company shall be perpetual, unless the Company is dissolved in accordance with either
the provisions of this Agreement or the Act. 
 3. Purposes. The purposes of the Company are to carry on any
lawful business, purpose or activity for which limited liability companies may be formed under the Act. The Company shall have all of the powers to conduct such business as permitted under the Act. 

4. Member. CRS Proppants LLC a Delaware limited liability company, is the sole member of the Company (such member or its
successor, the “Member”). 
 5. Allocations to Member. The Member shall receive the allocation of
all profits, losses, gains, deductions and credits with respect to the operations of the Company. 
 6.
Contributions. Without creating any rights in favor of any third party, the Member may, from time to time, make contributions of cash or property to the capital of the Company, but shall have no obligation to do so. 

7. Distributions. The Member shall be entitled (a) to receive all distributions (including, without limitation,
liquidating distributions) made by the Company and (b) to enjoy all other rights, benefits and interests as the sole Member of the Company. 
 8. Management. The management of the Company is fully reserved to the Member. The powers of the Company shall be exercised by or under the authority of, and the business and affairs of the
Company shall be managed under the direction of, the Member, who shall make all decisions and take all actions for the Company. The Member may from time to time delegate to one or more persons such authority as the Member may deem advisable and may
elect one or more persons as a president, vice president, secretary, treasurer or any other title of an officer (“Officer”) of the Company as determined by the Member to act on behalf of the Company with respect to any matter or
matters delegated to such person by the Member. No Officer need be a resident of the State of Delaware. In the event the Member appoints a person as an Officer of the Company, the Member shall be deemed to have assigned and may thereafter assign
titles to particular Officers. 
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Exchange Commission. Confidential treatment has been requested with respect to the omitted portions. 

 9. Officers. Each Officer shall hold office until the death, resignation, or
removal of such Officer by the Member (with or without cause). Unless the Member decides otherwise, all Officers of the Company, as between themselves and the Company, shall have such authority, perform such duties and manage the Company as provided
below. 
 (a) The President. The President shall have the active, executive management of the operations
of the Company, subject however to the control of the Member. The President shall, in general, perform all duties incident to the office of president and such other duties as from time to time may be assigned to him or her by the Member. 

(b) The Vice President. The Vice President shall have such powers and perform such duties as the Member may from
time to time prescribe or as the President may from time to time delegate to him or her. At the request of the President, the Vice President may temporarily act in place of the President. In the case of the death, absence, or inability to act of the
President, the Member may designate the Vice President to perform the duties of the President. 
 (c) The
Secretary. The Secretary shall keep or cause to be kept the minutes of any Company meetings; shall see that all notices are duly given in accordance with the provisions of applicable law; shall be custodian of the records and, in general, shall
perform all duties incident to the office of the secretary and such other duties as may from time to time be assigned by the Member or by the President. 
 (d) The Treasurer. The Treasurer shall be the principal financial officer of the Company; shall have charge and custody of and be responsible for all funds of the Company and deposit all such funds
in the name of the Company in such banks, trust companies or other depositories as shall be selected by the Member; shall receive and give receipts for moneys due and payable to the Company from any source; and, in general, shall perform all the
duties incident to the office of treasurer and such other duties as from time to time may be assigned by the Member or by the President. The Treasurer shall render to the President and the Member, whenever the same shall be required, an account of
all transactions accomplished as treasurer and of the financial condition of the Company. 
 10. Tax Matters. The
Company and the Member shall comply with all requirements of the Internal Revenue Code of 1986, as amended, with respect to the Company. In this regard, the Company shall be disregarded for federal tax purposes as provided in Treasury Regulations
Section 301.7701-3. 
 11. Indemnification. To the extent allowed under the laws of the State of Delaware,
the Company shall indemnify the Member and the Company’s Officers and employees from and against any and all losses, claims, damages, liabilities, joint or several, expenses (including reasonable legal fees and expenses), judgments, fines,
settlements, and other amounts arising from any and all claims, demands, actions, suits or proceedings, civil, criminal, administrative or investigative, that relate to the operations of the Company as set forth in this Agreement in which the
Member, any Officer or any employee may be involved, or is threatened to be involved, as a party or otherwise, REGARDLESS OF WHETHER ARISING FROM ANY 
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portions. 

  
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ACT OR OMISSION WHICH CONSTITUTED THE SOLE, PARTIAL OR CONCURRENT NEGLIGENCE (WHETHER ACTIVE OR PASSIVE) OF SUCH MEMBER, OFFICER OR EMPLOYEE, unless it is established that: (1) the act or
omission of such Member, Officer or employee was material to the matter giving rise to the proceeding and either was committed in bad faith or was the result of active and deliberate dishonesty; (2) the Member, Officer or employee actually
received an improper personal benefit in money, property or services; or (3) in the case of any criminal proceeding, the Member, Officer or employee had reasonable cause to believe that the act or omission was unlawful. The termination of any
proceeding by judgment, order or settlement does not create a presumption that the Member, Officer or employee did not meet the requisite standard of conduct set forth in this Section 11. The termination of any proceeding by conviction
or upon a plea of nolo contendere or its equivalent, or an entry of an order of probation prior to judgment, creates a rebuttable presumption that the Member, Officer or employee acted in a manner contrary to that specified in this
Section 11. Any indemnification pursuant to this Section 11 shall be made only out of the assets of the Company, including insurance proceeds, if any. 
 12. Transfers. The Member may freely transfer all or any part of its membership interest in the Company at any time, and any such transferee shall become an additional or substituted Member
of the Company, as applicable, with full rights of a Member as set forth herein and in the Act. 
 13.
Dissolution. The Company shall dissolve and its affairs shall be wound up at such time, if any, as the Member may elect or as may be required under the Act. No other event will cause the Company to dissolve. 

14. Amendment. This Agreement may be amended at any time with the consent of the Member. 

15. Governing Law. THIS AGREEMENT IS GOVERNED BY AND SHALL BE CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE
(EXCLUDING ITS CONFLICT-OF-LAWS RULES). 
 [Signature Page Follows] 

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has been requested with respect to the omitted portions. 

  
 3 

 IN WITNESS WHEREOF, the undersigned sole Member of the Company has executed this
Agreement as of the date first above written. 
  

			
	SOLE MEMBER:
	
	CRS PROPPANTS LLC
		
	By:	 	/s/ Stephen R. Horn
	Name:	 	Stephen R. Horn
	Title:	 	Manager

  

			
	
		
	By:	 	/s/ Steven L. Cobb
	Name:	 	Steven L. Cobb
	Title:	 	Manager

 LLC AGREEMENT 
 GREAT NORTHERN SAND LLC 
 SIGNATURE PAGE 

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has been requested with respect to the omitted portions.

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