Document:

Exhibit
 4.2

 

 [DynaResource,
Inc. Letterhead]

 

JUNE
20, 2013

 

TO:  
DynaResource, Inc. Promissory Note holder

RE:   
Revision to Promissory Note; Your acknowledgement

 

 

Dear Note
holder:

 

During
the most recent review conducted by the Auditing Firm, The Hall Group, CPA’s a question was raised by a reviewer regarding
the language used in the Promissory Note. The language in question is contained in Section of the Note Titled “Additional
Payment”; which Section is copied and pasted here below:

 

ADDITIONAL
PAYMENT.  Borrower will pay additional amounts to Lender equal to ten percent (10%) of the net profits generated
from the pilot plant operations on the first fifty thousand tons processed through the pilot plant. Such net profits will be calculated
after deducting all expenses related to the production and after deducting thirty three percent (33%) from the net profits, to
be deposited into a sinking fund.

 

One
interpretation of this language as described by the reviewed was that each and every note holder would receive ten percent of
the net profits after certain deductions. Obviously, this interpretation is illogical, and simple reason would not support the
view. However, the reviewed has requested that the Company obtain the Written Consent of Each Note Holder to a simple revision
of this Section of the Note.

 

The revised
language for this Section of the Note is proposed below:

 

ADDITIONAL
PAYMENT (Revised).  Borrower will pay additional amounts to Lender (referring to All Promissory Note Holders as
a Group), so that each Lender shall receive their portion in accordance with their percentage of the total from all Lenders),
such additional payment equal to ten percent (10%) of the net profits generated from the pilot plant operations on the first fifty
thousand tons processed through the pilot plant. Such net profits will be calculated after deducting all expenses related to the
production and after deducting thirty three percent (33%) from the net profits, to be deposited into a sinking fund.

 

Your
written acknowledgement below will confirm your agreement with the Language of Section “Additional Payment (Revised)”
as set forth above.

 

 

 

	 	 	 
	Signature	 	 
	 	 	 
	 	 	 
	 	 	 
	Name	 	 
	 	 	 
	 	 	 
	 	 	 
	Address	 	 
	 	 	 
	 	 	 
	 	 	 
	City, State & Zip Code	 	 
	 	 	 
	 	 	 
	PROMISSORY NOTE AMOUNTExhibit 4.3

 

PROMISSORY
NOTE 

 

Series
II

 

 

	Borrower:	 	DynaResource, Inc.	 
	 	 	222 W. Los Colinas Blvd.	 
	 	 	Suite 744 East Tower	 
	 	 	Irving, Texas 75039	 

 

 

	LENDER:	 	 	 
	 	 	 	 
	 	 	 	 
	 	 	 	 
	 	 	 	 

 

 

	PRINCIPAL AMOUNT:	$	 	 
	 	 	 	 
	 	 	 	 
	DATE of the NOTE:	 	SEPTEMBER (1ST),
            2013	 

 

  

 

PROMISE
TO PAY.             DynaResource, Inc. , office address in Irving Texas as set forth above (“Borrower”) hereby
promises to pay to (“LENDER”) in lawful money of the United States of America, the principal amount of
 ($_____________), together with interest at the rate of 12.5% per annum on the unpaid principal balance from the date
of the note until maturity. The loan will accrue interest for twelve months with the accrued interest added to principal. After
the First Year, Interest will be paid quarterly in arrears, with the first payment due in Month Sixteen and continuing until maturity
unless redeemed earlier.

 

PAYMENT.            Borrower
will pay interest only, quarterly in arrears starting in month sixteen. Interest will accrue for twelve months and paid in month
sixteen, and being paid quarterly in arrears thereafter and continuing until the note principal is paid in full. The annual interest
rate for this Note is computed on a simple interest basis at 12.5% per annum. Borrower will pay Lender at Lender’s address
as shown on this promissory note document or at such other place as Lender may designate in writing.

 

ADDITIONAL
PAYMENT.   Borrower will pay additional amounts to Lender (referring to All Promissory Note Holders dated September
1, 2013 as a Group; in the Maximum Amount of $ 1.5 M, so that each Lender shall receive their proportionate percentage in accordance
with their percentage of the total of $ 1.5 M), such additional payment equal to ten percent (10%) of the net profits generated
from the pilot plant operations on the SECOND Fifty Thousand Tons (Tonnage 50,001 – 100,000 Tons) processed through the
pilot plant. This additional payment will be paid quarterly in arrears based on the net profits for the prior quarter. Such net
profits will be calculated after deducting all expenses related to the production and after deducting thirty three percent (33%)
from the net profits, to be deposited into a sinking fund.

 

MATURITY
DATE.               DECEMBER 31, 2016.

 

PREPAYMENT.       Borrower
may Pre-Pay the Note and Accrued Interest, with a thirty (30) day notice, with a ten percent (10%) penalty fee on the principal
amount, all or a portion of the principal amount owed hereunder. All prepayments shall be applied to the indebtedness in such
order and manner as Lender may from time to time determine in its sole discretion. Borrower agrees not to send Lender payments
marked “paid in full”, “without recourse”, or similar language. If Borrower sends such a payment, Lender
may accept it without losing any of Lender’s rights under this Note, and Borrower will remain obligated to pay any further
amount owed to Lender. All written communications concerning disputed amounts, including any check or other payment instrument
that indicates that the payment constitutes “payment in full” of the amount owed or that is tendered with other conditions
or limitations or as full satisfaction of a disputed amount must be mailed or delivered to: DynaResource, Inc., 222 W. Las Colinas
Blvd, Suite 744 East Tower, Irving, Texas 75039.

 

Upon
thirty day notice of intent to pre pay by Borrower, Lender may convert principal and any accrued interest on the terms listed
in the section titled “CONVERTIBILITY”.

 

CONVERTIBILITY.              The
Lender may, at any time prior to maturity or prepayment, Convert any unpaid principal and accrued interest into common stock of
DynaResource, Inc. at the conversion price of $5.00 per share. Additionally, on conversion, lender would receive a Warrant exercisable
into the Company’s common stock at $7.50, such warrant expiring within 2 years of issue date.

 

POST
MATURITY RATE. Upon the occurrence of any Event of Default, or if this Note is not paid at final maturity, Lender,
at Lender’s option, may add any unpaid accrued interest to the principal and such sum will bear interest therefrom until
paid, at the Post Maturity Rate provided in this Note. The Post Maturity Rate on this Note is 12.5% per annum. Borrower will pay
interest on all sums due after final maturity, whether by acceleration or otherwise, at that rate. Borrower also will pay interest
at the Post Maturity Rate on the principal amount of each past due installment from the due date until paid.

 

DEFAULT.
       Each of the following shall constitute an event of default (“Event of Default”) under this Note.

 

Payment
Default.                   Borrower
fails to make any payment when due under this Note.

 

Other
Defaults.                    Borrower
fails to comply with or to pay or perform any other term, obligation, covenant or condition contained in this note or to comply
with or to pay or perform any term, obligation, covenant or condition contained in any other agreement between Lender and Borrower.

 

Transfer
of Assets.             Borrower leases, sells, or otherwise
conveys, or agrees to lease, sell, or otherwise convey, a material part of its assets or business outside of the ordinary course
of business.

 

False
Statements.                Any warranty, representation
or statement made or furnished to Lender by Borrower or on Borrower’s behalf under this Note is false or misleading in any
material respect, either now or at the time made or furnished or becomes false or misleading at any time thereafter.

 

Judgments
or Decrees.    One or more judgments or decrees shall be entered against the Borrower and such judgments or
decree shall not have been vacated, discharged, stayed or bonded pending appeal.

 

Failure
to Comply with Laws.   Borrower fails to comply with all applicable statues, laws, ordinances and governmental
rules, regulations and orders to which it is subject or which are applicable to its business, property and assets.

 

LENDER’S
RIGHTS. Upon the occurrence of any Event of Default, Lender may declare the entire unpaid principal balance on this
Note and the Indebtedness and all accrued unpaid interest immediately due, without notice, and then Borrower will pay that amount.
Borrower shall be liable for any deficiency remaining after disposition of any collateral which Lender may choose to realize upon.

 

ATTORNEYS’
FEES: EXPENSES. Lender may hire an attorney to help collect this Note if Borrower does not pay, and Borrower will
pay Lender’s reasonable attorneys’ fees. Borrower also will pay Lender all other amounts Lender actually incurs as
court costs, lawful fees for filing, recording, releasing to any public office any instrument securing this Note; the reasonable
cost actually expended for repossessing, storing, preparing for sale, and selling any security; and fees for noting a lien on
or transferring a certificate of title to any motor vehicle offered as security for this Note, or premiums or identifiable charges
received in connection with the sale of authorized insurance.

 

GOVERNING
LAW. This Note will be governed by, construed and enforced in accordance with federal law and the laws of the
State of Texas. This Note has been accepted by Lender in the State of Texas.

 

CHOICE
OF VENUE. If there is a lawsuit, Borrower and Lender agree to submit to the jurisdiction of the courts of Dallas County,
State of Texas.

 

DISHONORED
CHECK CHARGE. Borrower will pay a processing fee of $25.00 if any check given by Borrower to Lender as a payment on
this loan is dishonored.

 

COLLATERAL.
Borrower acknowledges this Note is secured by the full faith and credit of DynaResource, Inc. and common stock of
DynaResource, Inc. at the conversion rate of $5.00 per share.

 

ENFORCEABILITY
AND ORGANIZATION.Borrower is duly authorized to transact business in all states in which Borrower is doing business,
having obtained all necessary filings, governmental licenses and approvals for each state in which Borrower is doing business.
Borrower’s execution, delivery and performance of this Note have been duly authorized by all necessary Corporate Officers
and Directors of Borrower. This Note constitutes a legal, valid and binding obligation of Borrower enforceable against Borrower
in accordance with their respective terms. If applicable, Borrower is an entity which is, and at all times shall be, duly organized,
validly existing, and in good standing under and by virtue of the laws of the state of its organization.

 

INFORMATION
WAIVER. Lender may provide, without any limitation whatsoever, to any one or more purchasers, potential purchasers,
or affiliates, any information or knowledge Lender may have about the undersigned or about any matter relating to this document
and the undersigned hereby waives any right to privacy the undersigned may have with respect to such matters.

 

INDEBTEDNESS.
The word “indebtedness” means all principal, interest, and other amounts, costs and expenses payable under
the Note, together with all renewals of, extensions of, modifications of, consolidations of and substitutions for the Note.

 

PURPOSE.
Borrower agrees that no advances under this Note shall be used for personal, family or household purposes and that
all advances hereunder shall be used solely for business, commercial, agricultural or other similar purposes.

 

ARBITRATION.
Undersigned and Lender agree that all disputes, claims and controversies between them whether individual, joint, or
class in nature, arising from this document or otherwise, including without limitation contract and tort disputes, shall be arbitrated
pursuant to the Rules of the American Arbitration Association in effect at the time the claim is filed, upon request of either
party. No act to take or dispose of any collateral securing this document shall constitute a waiver of this arbitration agreement
or be prohibited by this arbitration agreement. This includes, without limitation, obtaining injunctive relief or a temporary
restraining order; invoking a power of sale under any deed of trust or mortgage; obtaining a writ of attachment or imposition
of a receiver; or exercising any rights relating to personal property, including taking or disposing of such property with or
without judicial process pursuant to applicable law. Any disputes, claims, or controversies concerning the lawfulness or reasonableness
of any act, or exercise of any right, concerning any Collateral or Property securing this document, including any claim to rescind,
reform, or otherwise modify any agreement relating to the Collateral or Property securing this document, shall also be arbitrated,
provided however that no arbitrator shall have the right or the power to enjoin or restrain any act of any party. Judgment upon
any award rendered by any arbitrator may be entered in any court having jurisdiction. Nothing in this document shall preclude
any party from seeking equitable relief from a court of competent jurisdiction. The statue of limitations, estoppel, waiver, laches,
and similar doctrines which would otherwise be applicable in an action brought by a party shall be applicable in any arbitration
proceeding, and the commencement of arbitration shall be deemed the commencement of an action for these purposes. The Federal
Arbitration Act shall apply to the construction, interpretation, and enforcement of this arbitration provision.

 

JURY
WAIVER. THE UNDERSIGNED AND LENDER (BY ITS ACCEPTANCE HEREOF) HEREBY VOLUNTARILY, KNOWINGLY, IRREVOCABLY AND UNCONDITIONALLY
WAIVE ANY RIGHT TO HAVE A JURY PARTICIPATE IN RESOLVING ANY DISPUTE (WHETHER BASED UPON CONTRACT, TORT OR OTHERWISE) BETWEEN OR
AMONG THE UNDERSIGNED AND LENDER ARISING OUT OF OR IN ANY WAY RELATED TO THIS DOCUMENT, OR ANY RELATIONSHIP BETWEEN OR AMONG THE
UNDERSIGNED AND LENDER. THIS PROVISION IS A MATERIAL INDUCEMENT TO LENDER TO PROVIDE THE FINANCING EVIDENCED BY THIS DOCUMENT.

 

BORROWER
CERTIFICATIONS. By execution of this Note Borrower hereby certifies to Lender that as of the date hereof:

 

		(1)	that
                                         there has been no adverse change in Borrower’s financial condition, organization,
                                         operations or fixed assets since the date the Loan application for the indebtedness for
                                         this Note was signed; and

 

		(2)	Borrower
                                         is/are current on all federal, state, and local taxes, including but not limited to income
                                         taxes, payroll taxes, real estate taxes, and sales taxes.

 

GENERAL
PROVISIONS.

 

NOTICE:Under
no circumstances (and notwithstanding any other provisions of this Note shall the interest charged, collected, or contracted for
on this Note exceed the maximum rate permitted by law. The term “maximum rate permitted by law” as used in this Note
means the greater of (a) the maximum rate of interest permitted under federal or other law applicable to the indebtedness evidenced
by this Note, or (b) the higher, as of the date of this Note, of the “Weekly Ceiling” or the “Quarterly Ceiling”
as referred to in Sections 303.201 and 303.202 of the Texas Finance Code and Articles 1D.002, 1D.003 and 1D.006 of the Texas Credit
Title respectively. If any part of this Note cannot be enforced, this fact will not affect the rest of the Note. Borrower does
not agree or intend to pay, and Lender does not agree or intend to contract for, charge, collect, take, reserve or receive (collectively
referred to herein as “charge or collect”), any amount in the nature of interest or in the nature of a fee for this
loan, which would in any way or event (including demand, prepayment, or acceleration) cause Lender to charge or collect more for
this loan than the maximum Lender would be permitted charge or collect by federal law or the law of the State of Texas (as applicable).
Any such excess interest or unauthorized fee shall, instead of anything stated to the contrary, be applied first to reduce the
principal balance of this loan, and when the principal has been paid in full, be refunded to Borrower. The right to accelerate
maturity of sums due under this Note does not include the right to accelerate any interest which has note otherwise accrued on
the date of such acceleration, and Lender does not intend to charge or collect any unearned interest in the event of acceleration.
All sums paid or agreed to be paid to Lender for the use, forbearance or detention of sums due hereunder shall, to the extent
permitted by applicable law, be amortized, prorated, allocated and spread throughout the full term of the loan evidenced by this
Note until payment in full so that the rate or amount of interest on account of the loan evidenced hereby does not exceed the
applicable usury ceiling. If any part of this Note cannot be enforced, this fact will not affect the rest of this Note. It is
agreed that any payment which would otherwise for any reason be deemed unlawful interest under applicable law shall be deemed
to have been applied to the unpaid principal balance of this Note, or to other indebtedness. The unpaid balance owing on this
Note at any time may be evidenced by endorsements on this Note or by Lender’s internal records, including daily computer
print-outs. Lender may delay or forgo enforcing any of its rights or remedies under this Note without losing them. Borrower and
any other person who signs, guarantees or endorses this Note, to the extent allowed by law, waive presentment, demand for payment,
notice of dishonor, notice of intent to accelerate the maturity of this Note, and notice of acceleration of the maturity of this
Note. Upon any change in the terms of this Note, and unless otherwise expressly stated in writing, no party who signs this Note,
whether as maker, guarantor, accommodation maker or endorser, shall be released from liability. Unless specifically permitted
otherwise by the terms and conditions of this Note, no alteration of or amendment to this Note shall be effective unless given
in writing and signed by the party or parties sought to be charged or bound by the alteration or amendment. Borrower agrees and
consents to Lender’s sale or transfer, whether now or later, of this Note, or the sale or transfer of any participation
interest in this Note or to one or more purchasers, whether related or unrelated to the Lender. Borrower waives any and all notices
of sale of this Note, the sale or transfer of any participation interests, as well as any notices of any repurchases of this Note,
the , or of any participation interests. The obligations under this Note are joint and several.

 

PRIOR
TO SIGNING THIS NOTE, BORROWER AND LENDER READ AND UNDERSTOOD ALL THE PROVISIONS OF THIS NOTE. BORROWER AGREES TO THE TERMS OF
THE NOTE.

 

BORROWER
ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS PROMISSORY NOTE.

 

 

  

 

 

 

SIGNATURES:

 

 

 

BORROWER:

 

DynaResource,
Inc.

 

 

 

	By:	 	 	 
	 	 	CHARLES SMITH; CFO	 
	 	 	 	 
	 	 	 	 
	 	 	K.D. DIEPHOLZ; Chairman / CEO.	 

 

 

 

LENDER:

 

 

 

	By:

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